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About the Advanced Search and Download Scientific Name Review Selections or Sort Report State Search Advanced Search Report Advanced Search Search Help Click on an accepted name below to view its Profile with all synonyms, distribution map, more information, and web links if available. If shown, synonyms are indented beneath accepted counterparts. Click on a column header to learn about that category. Click on the Download link at the top right of the page to download a comma delimited text version of this data to use in another application or database. Alternative Crops Federal T/E State T/E Characteristics Scientific Name Common Name Family Growth Habit Status Status Classification Abies balsamea balsam fir Pinaceae CT (E) Cover Crops Abies concolor white fir Pinaceae Tree NV (CY)

Culturally Significant Abies fraseri Fraser fir Pinaceae Tree TN (T) Abies lasiocarpa var. lasiocarpa subalpine fir Pinaceae Tree NV () Distribution Update Abies bifolia NV (CY) Documentation Abies lowiana Sierra white fir Pinaceae Tree NV (CY) Fact Sheets & Guides Abies magnifica red fir Pinaceae Tree NV (CY) Introduced, Invasive, and Abronia macrocarpa largefruit sand verbena Nyctaginaceae /herb Endangered TX (E) Noxious Plants Threatened & Endangered Abronia umbellata ssp. breviflora pink sand verbena Nyctaginaceae Forb/herb, Vine OR (E) Abronia umbellata ssp. acutalata WA (PX) Wetland Indicator Status Acacia angustissima prairie acacia Subshrub, FL (E) Forb/herb Acacia choriophylla cinnecord Fabaceae Tree, FL (E) 50,000+ Plant Images Acacia tortuosa poponax Fabaceae Tree, Shrub FL (E) Acalypha deamii Deam's threeseed mercury Euphorbiaceae Forb/herb IN (T), PA (X), Complete PLANTS TN (SC) Checklist Acalypha virginica var. deamii OH (PRX) State PLANTS Checklist Acalypha virginica threeseed mercury Euphorbiaceae Forb/herb CT (SC), ME (PX), Advanced Search Download NH (T), NY (E) Symbols for Unknown Acanthocereus tetragonus triangle Cactaceae Vine, Shrub FL () Plants Acanthocereus pentagonus FL (T) NRCS State GSAT Lists Acanthomintha duttonii San Mateo thorn-mint Lamiaceae Forb/herb CA (E) NRCS State Plants Lists Acanthomintha ilicifolia San Diego thorn-mint Lamiaceae Forb/herb Threatened CA (E) Acer leucoderme chalk Aceraceae Tree, Shrub TN ()

Crop Nutrient Tool Acer saccharum ssp. leucoderme TN (SC) Acer nigrum black maple Aceraceae Tree CT (SC), MA (SC), Ecological Site Information NH (T) System Acer pensylvanicum striped maple Aceraceae Tree, Shrub OH (E), RI (SC) PLANTS Identification Keys Acer spicatum mountain maple Aceraceae Tree, Shrub KY (E), RI (T) Plant Materials Web Site var. borealis boreal yarrow Forb/herb ME (SC) Plant Materials Publications Achillea sibirica Siberian yarrow Asteraceae Forb/herb MN (T) Achnatherum hymenoides Indian ricegrass Graminoid MN () USDA Plant Hardiness Map MN (E) Acmella oppositifolia oppositeleaf spotflower Asteraceae Forb/herb TN (SC) Acoelorraphe wrightii Everglades palm Arecaceae Tree, Shrub FL (T) Aconitum noveboracense northern blue monkshood Forb/herb Threatened IA (T), NY (T), OH (E), WI (T) Aconitum reclinatum trailing white monkshood Ranunculaceae Forb/herb PA (E), TN (E) Aconitum uncinatum southern blue monkshood Ranunculaceae Forb/herb IN (E), KY (T), MD (E), OH (E), PA (T) Acorus americanus sweetflag Acoraceae Forb/herb PA (E) Acrostichum aureum golden leatherfern Forb/herb FL (T) arizonica bugbane Ranunculaceae Forb/herb AZ () arizonica AZ (HS) Actaea elata tall bugbane Ranunculaceae Forb/herb WA () Cimicifuga elata WA (T) white baneberry Ranunculaceae Forb/herb FL (E), NY (EV) Actaea podocarpa mountain bugbane Ranunculaceae Forb/herb IL (), PA () Cimicifuga americana IL (E), PA (R) Actaea racemosa var. racemosa black bugbane Ranunculaceae Forb/herb IL (), MA () Cimicifuga racemosa IL (E), MA (E) Actaea rubifolia Appalachian bugbane Ranunculaceae Forb/herb IL (), IN (), KY (), TN ()

Cimicifuga rubifolia IL (T), IN (E), KY (T), TN (T) red baneberry Ranunculaceae Forb/herb IN (R), OH (T), RI (SC) Actaea rubra ssp. rubra red baneberry Ranunculaceae Forb/herb NY () Actaea spicata ssp. rubra NY (EV) Actinostachys pennula ray Schizaeaceae Forb/herb FL () Schizaea germanii FL (E) aleuticum Aleutian maidenhair Pteridaceae Forb/herb ME (E) Adiantum capillus-veneris common maidenhair Pteridaceae Forb/herb KY (T), NC (E) Adiantum melanoleucum fragrant maidenhair Pteridaceae Forb/herb FL (E) northern maidenhair Pteridaceae Forb/herb NY (EV) Adiantum tenerum fan maidenhair Pteridaceae Forb/herb FL (E) Green Mountain maidenhair Pteridaceae Forb/herb VT (T) allegheny vine Fumariaceae Vine, Forb/herb IN (X), KY (E), Adlumia fungosa MA (T), MD (T), ME (T), NH (T), OH (T), RI (E), TN (T)

Adoxa moschatellina muskroot Adoxaceae Forb/herb IL (E), NY (E), WI (T) Aeschynomene pratensis jointvetch Fabaceae Subshrub, Shrub, FL (E) Forb/herb Aeschynomene virginica Virginia jointvetch Fabaceae Forb/herb Threatened MD (E), NC (E), NJ (E), PA (X) Aesculus pavia red buckeye Hippocastanaceae Tree, Shrub KY (T) acuta sandplain false foxglove Forb/herb Endangered CT (E), MA (E), MD (E), NY (E), RI (E) Agalinis auriculata earleaf false foxglove Scrophulariaceae Forb/herb IN (E), KY (E), MD (E), MN (E), OH (E), TN (E) Tomanthera auriculata IL (T), MI (PREX), PA (E) Agalinis fasciculata beach false foxglove Scrophulariaceae Forb/herb MD (E), NY (R) Agalinis gattingeri roundstem false foxglove Scrophulariaceae Forb/herb IA (T), MI (E), MN (E), OH (PRX), WI (T) Agalinis maritima saltmarsh false foxglove Scrophulariaceae Forb/herb ME (SC), NH (T) Agalinis neoscotica Middleton false foxglove Scrophulariaceae Forb/herb ME (T) Agalinis obtusifolia tenlobe false foxglove Scrophulariaceae Forb/herb KY (E), MD (E) Agalinis decemloba PA (X) Agalinis oligophylla ridgestem false foxglove Scrophulariaceae Forb/herb TN () Agalinis pseudaphylla TN (E) Agalinis paupercula smallflower false foxglove Scrophulariaceae Forb/herb PA (E) Agalinis paupercula var. borealis smallflower false foxglove Scrophulariaceae Forb/herb NY (T) Agalinis purpurea var. parviflora OH (E) Agalinis plukenetii Chattahoochee false foxglove Scrophulariaceae Forb/herb TN (E, PX) Agalinis setacea threadleaf false foxglove Scrophulariaceae Forb/herb MD (E) Agalinis skinneriana Skinner's false foxglove Scrophulariaceae Forb/herb IA (E), IL (T), IN (E), KY (E), MD (E), MI (E), OH (E), WI (E) slenderleaf false foxglove Scrophulariaceae Forb/herb RI (SC) Agastache foeniculum blue giant hyssop Lamiaceae Subshrub, IA (E) Forb/herb Agastache nepetoides yellow giant hyssop Lamiaceae Subshrub, CT (SC), NY (T), Forb/herb VT (T), WI (T) Agastache scrophulariifolia purple giant hyssop Lamiaceae Subshrub, CT (E), KY (SC), Forb/herb MA (E), MD (T), TN (SC), VT (T) Agave ×arizonica Arizona century plant Agavaceae Forb/herb, Shrub, AZ () Subshrub Agave arizonica Endangered AZ (HS) Agave chrysantha goldenflower century plant Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave delamateri Tonto Basin century plant Agavaceae Forb/herb, Shrub, AZ (HS) Subshrub Agave deserti ssp. simplex desert agave Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave murpheyi Murphey's century plant Agavaceae Subshrub, Shrub, AZ (HS) Forb/herb Agave palmeri Palmer's century plant Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave parryi ssp. parryi Parry's agave Agavaceae Shrub, Forb/herb, AZ (SR) Subshrub Agave parryi var. couesii AZ (SR) Agave parviflora smallflower century plant Agavaceae Subshrub, Shrub, AZ (HS, SR) Forb/herb Agave schottii var. schottii Schott's century plant Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave schottii var. treleasei Trelease's century plant Agavaceae Subshrub, Shrub, AZ (HS, SR) Forb/herb Agave toumeyana var. bella Toumey's century plant Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave toumeyana var. toumeyana Toumey's century plant Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave univittata McKelvey's century plant Agavaceae Forb/herb, Shrub, AZ () Subshrub Agave mckelveyana AZ (SR) Agave utahensis var. kaibabensis Kaibab agave Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Agave utahensis var. utahensis agave Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Ageratina aromatica lesser snakeroot Asteraceae Forb/herb MA (E) Ageratina aromatica var. aromatica lesser snakeroot Asteraceae Forb/herb CT (), NY (), OH (), RI () Eupatorium aromaticum CT (E), NY (E), OH (T), RI (H) Ageratina luciae-brauniae Lucy Braun's snakeroot Asteraceae Forb/herb KY (SC), TN (T) Ageratum littorale Cape Sable whiteweed Asteraceae Forb/herb FL (E) Agoseris elata tall agoseris Asteraceae Forb/herb WA (S) Agoseris glauca pale agoseris Asteraceae Forb/herb, Shrub, MI (T) Subshrub Agrimonia gryposepala tall hairy agrimony Rosaceae Forb/herb KY (T) Agrimonia incisa incised agrimony Rosaceae Forb/herb FL (E) Agrimonia parviflora harvestlice Rosaceae Forb/herb CT (SC), MA (E) Agrimonia pubescens soft agrimony Rosaceae Forb/herb MA (T), RI (H) Agrimonia rostellata beaked agrimony Rosaceae Forb/herb NY (T) Agrimonia striata roadside agrimony Rosaceae Forb/herb MD (E) Agrostis blasdalei Blasdale bentgrass Poaceae Graminoid CA () Agrostis blasdalei var. marinensis CA (R) Agrostis elliottiana Elliott's bentgrass Poaceae Graminoid OH (PRX) Agrostis mertensii northern bentgrass Poaceae Graminoid ME (T), NY (T), TN (SC) Agrostis borealis WA (S) Agrostis perennans upland bentgrass Poaceae Graminoid PA () Agrostis altissima PA (X) Aletris aurea golden colicroot Forb/herb MD (E, X) Aletris bracteata bracted colicroot Liliaceae Forb/herb FL (E) Aletris farinosa white colicroot Liliaceae Forb/herb ME (PX), NY (T), PA (E), RI (SC) Aliciella formosa Aztec gilia Polemoniaceae Forb/herb NM () Gilia formosa NM (E) Aliciella leptomeria sand gilia Polemoniaceae Forb/herb WA () Gilia leptomeria WA (S) Alisma triviale northern water plantain Alismataceae Forb/herb NJ (E) Alisma plantago-aquatica var. americanum PA (E) acuminatum tapertip Liliaceae Forb/herb AZ (SR) var. cristatum darkred onion Liliaceae Forb/herb AZ () Allium nevadense var. cristatum AZ (SR) Allium bigelovii Bigelow's onion Liliaceae Forb/herb AZ (SR) twincrest onion Liliaceae Forb/herb AZ (SR) Allium burdickii narrowleaf wild Liliaceae Forb/herb NY (E), TN (CE, T) dusky onion Liliaceae Forb/herb WA (S) meadow Liliaceae Forb/herb ME (SC), NH (E), VT (T) nodding onion Liliaceae Forb/herb IA (T), MN (T), NY (T) Allium cernuum var. neomexicanum New Mexican nodding onion Liliaceae Forb/herb AZ (SR) Allium cernuum var. obtusum nodding onion Liliaceae Forb/herb AZ (SR) Allium constrictum Grand Coulee onion Liliaceae Forb/herb WA (S) Allium dictuon Blue Mountain onion Liliaceae Forb/herb WA (T) Allium geyeri var. geyeri Geyer's onion Liliaceae Forb/herb AZ (SR) Allium geyeri var. tenerum bulbil onion Liliaceae Forb/herb AZ (SR) Allium glandulosum gland onion Liliaceae Forb/herb AZ () Allium rhizomatum AZ (SR) Allium gooddingii Goodding's onion Liliaceae Forb/herb AZ (HS), NM (E) Allium kunthii Kunth's onion Liliaceae Forb/herb AZ (SR) Allium macropetalum largeflower onion Liliaceae Forb/herb AZ (SR) Allium munzii Munz's onion Liliaceae Forb/herb Endangered CA (T) Allium nevadense onion Liliaceae Forb/herb AZ (SR) Allium parishii Parish's onion Liliaceae Forb/herb AZ (SR) Allium plummerae Tanners Canyon onion Liliaceae Forb/herb AZ (SR) Allium schoenoprasum wild Liliaceae Forb/herb MI (T) Allium schoenoprasum var. sibiricum wild chives Liliaceae Forb/herb MN (T), NH (T) Allium speculae Little River Canyon onion Liliaceae Forb/herb GA (T) autumn onion Liliaceae Forb/herb TN (E) ramp Liliaceae Forb/herb ME (SC), RI (SC), TN (CE, SC) Yosemite onion Liliaceae Forb/herb CA (R) Alnus incana ssp. rugosa speckled alder Betulaceae Tree, Shrub IL (E) Alnus viridis ssp. crispa mountain alder Betulaceae Tree, Shrub MA (T), PA (E), TN (SC) Alopecurus aequalis shortawn foxtail Poaceae Graminoid CT (T) Alvaradoa amorphoides Mexican alvaradoa Simaroubaceae Tree, Shrub FL (E) Amaranthus cannabinus tidalmarsh amaranth Amaranthaceae Forb/herb PA (R) Amaranthus pumilus seaside amaranth Amaranthaceae Forb/herb Threatened CT (SC), MD (E), NC (T), NJ (E), NY (E), RI (E) Ambrosia cheiranthifolia Rio Grande ragweed Asteraceae Forb/herb Endangered TX (E) Amelanchier bartramiana oblongfruit serviceberry Rosaceae Tree, Shrub MA (T), PA (E) Amelanchier humilis low serviceberry Rosaceae Shrub IN (E), PA (E) Amelanchier interior inland serviceberry Rosaceae Tree, Shrub IL (E) Amelanchier nantucketensis Nantucket serviceberry Rosaceae Shrub MA (SC), ME (T), NY (E) Amelanchier obovalis coastal serviceberry Rosaceae Shrub MD (E), PA (E) Amelanchier sanguinea roundleaf serviceberry Rosaceae Tree, Shrub CT (E), IL (E), MA (SC), NJ (E), OH (E), PA (E), TN (T) Amelanchier sanguinea var. gaspensis Gaspé serviceberry Rosaceae Tree, Shrub ME (SC) Amelanchier stolonifera running serviceberry Rosaceae Shrub MD (T), TN (SC) Amerorchis rotundifolia roundleaf orchid Orchidaceae Forb/herb ME (T), MI (E), WI (T) Amianthium muscitoxicum flypoison Liliaceae Forb/herb KY (T) Ammannia coccinea valley redstem Lythraceae Forb/herb, PA (T) Subshrub Ammannia latifolia pink redstem Lythraceae Forb/herb, NJ (E) Subshrub Ammannia robusta grand redstem Lythraceae Forb/herb WA (S) Ammophila breviligulata American beachgrass Poaceae Graminoid IL (E), MN (T), OH (T), PA (T) Ammophila champlainensis Champlain beachgrass Poaceae Graminoid NY (E), VT (E) Ammoselinum popei plains sandparsley Forb/herb TN (T) Santa Rita mountain yellowshow Bixaceae Forb/herb AZ (HS) Amorpha georgiana var. confusa false indigo Fabaceae Shrub NC (T) Amorpha georgiana var. georgiana Georgia false indigo Fabaceae Shrub NC (E) Amorpha herbacea var. crenulata clusterspike false indigo Fabaceae Shrub FL () Amorpha crenulata Endangered FL (E) Amorpha nana dwarf false indigo Fabaceae Subshrub, Shrub IA (T) Amorpha nitens shining false indigo Fabaceae Shrub IL (E) Amorpha paniculata panicled false indigo Fabaceae Shrub AR (T) Amphianthus pusillus little amphianthus Scrophulariaceae Forb/herb Threatened GA (T) bracteata var. comosa American hogpeanut Fabaceae Forb/herb, Vine NH (T) Amphicarpum purshii blue maidencane Poaceae Graminoid NY (E) Amphicarpum amphicarpon MA (E) Amsinckia carinata Malheur Valley fiddleneck Forb/herb OR (T) Amsinckia grandiflora largeflowered fiddleneck Boraginaceae Forb/herb Endangered CA (E) Amsonia kearneyana Kearney's bluestar Forb/herb Endangered AZ (HS) Amsonia tabernaemontana var. gattingeri eastern bluestar Apocynaceae Forb/herb KY (T), TN (SC) Amsonia tharpii feltleaf bluestar Apocynaceae Subshrub, NM (E) Forb/herb Anagallis minima chaffweed Primulaceae Forb/herb MD (E, X) Ancistrocactus tobuschii shorthook fishhook cactus Cactaceae Subshrub, Shrub Endangered TX (E) Andromeda polifolia bog rosemary Subshrub, Shrub PA (R) Andromeda polifolia var. glaucophylla bog rosemary Ericaceae Subshrub, Shrub CT (), IN (), NJ (), OH (), RI () Andromeda glaucophylla CT (T), IN (R), NJ (E), OH (PRX), RI (E) Andropogon arctatus pinewoods bluestem Poaceae Graminoid FL (T) Andropogon glomeratus var. glomeratus bushy bluestem Poaceae Graminoid OH () Andropogon virginicus var. abbreviatus OH (E) Andropogon gracilis wire bluestem Poaceae Graminoid FL () Schizachyrium sericatum FL (E) Androsace occidentalis western rockjasmine Primulaceae Forb/herb IN (T), MI (E), OH (T) Androstephium breviflorum pink funnel lily Liliaceae Forb/herb AZ (SR) Anemia wrightii Wright's flowering fern Anemiaceae Forb/herb FL (E) Anemone canadensis Canadian anemone Ranunculaceae Forb/herb CT (E), KY (H), MD (E, X), TN (E) Anemone caroliniana Carolina anemone Ranunculaceae Forb/herb IN (X), TN (E), WI (E) Anemone cylindrica candle anemone Ranunculaceae Forb/herb NJ (E), OH (T), PA (E), RI (SC) Anemone multifida Pacific anemone Ranunculaceae Forb/herb ME (T), VT (E) Anemone multifida var. multifida Pacific anemone Ranunculaceae Forb/herb WI () Anemone multifida var. hudsoniana WI (E) Anemone virginiana tall thimbleweed Ranunculaceae Forb/herb RI (H) Angadenia berteroi pineland golden trumpet Apocynaceae Forb/herb, Vine FL (T) Angelica atropurpurea purplestem angelica Apiaceae Forb/herb MD (E, X), RI (E), TN (T) Angelica lucida seacoast angelica Apiaceae Forb/herb CT (E), NY (E), RI (T) Angelica triquinata filmy angelica Apiaceae Forb/herb KY (E), MD (E) Angelica venenosa hairy angelica Apiaceae Forb/herb CT (SC) Antennaria corymbosa flat-top pussytoes Asteraceae Forb/herb WA (S) Antennaria howellii ssp. canadensis Canadian pussytoes Asteraceae Forb/herb NJ () Antennaria canadensis NJ (E) Antennaria howellii ssp. petaloidea small pussytoes Asteraceae Forb/herb CT () Antennaria neglecta var. petaloidea CT (SC) Antennaria parvifolia small- pussytoes Asteraceae Forb/herb WA (S) rosy pussytoes Asteraceae Forb/herb MI (T) Antennaria solitaria singlehead pussytoes Asteraceae Forb/herb MD (T), PA (E) Antennaria virginica shale barren pussytoes Asteraceae Forb/herb OH (T), PA (R) Anthoxanthum monticola ssp. monticola alpine sweetgrass Poaceae Graminoid ME (), NY (), VT () Anthoxanthum monticola ssp. orthantha NY (E) Apacheria chiricahuensis apachebush Crossosomataceae Subshrub, Shrub AZ (SR) Apios priceana traveler's delight Fabaceae Vine, Forb/herb Threatened KY (E), TN (E) Aplectrum hyemale Adam and Eve Orchidaceae Forb/herb CT (SC), MA (E), NJ (E), NY (E), PA (R), VT (T) cannabinum Indianhemp Apocynaceae Forb/herb MD () Apocynum sibiricum MD (E, X) Aquilegia canadensis red columbine Ranunculaceae Forb/herb FL (E) Aquilegia chrysantha golden columbine Ranunculaceae Forb/herb AZ (SR) var. pinetorum blue columbine Ranunculaceae Forb/herb AZ () Aquilegia caerulea var. pinetorum AZ (SR) Aquilegia desertorum desert columbine Ranunculaceae Forb/herb AZ (SR) Aquilegia elegantula western red columbine Ranunculaceae Forb/herb AZ (SR) Aquilegia longissima longspur columbine Ranunculaceae Forb/herb AZ (SR) Aquilegia micrantha Mancos columbine Ranunculaceae Forb/herb AZ (SR) Aquilegia triternata Chiricahua Mountain columbine Ranunculaceae Forb/herb AZ (SR) canadensis sicklepod Brassicaceae Forb/herb FL (E), NH (T) Arabis crucisetosa wetsoil rockcress Brassicaceae Forb/herb WA (S) Arabis ×divaricarpa spreadingpod rockcress Brassicaceae Forb/herb OH (E) Arabis drummondii Drummond's rockcress Brassicaceae Forb/herb IN (E), NJ (E), NY (E), OH (E), RI (SC), VT (E) Arabis georgiana Georgia rockcress Brassicaceae Forb/herb GA (T) Arabis glabra tower rockcress Brassicaceae Forb/herb IN (T), TN (SC) Arabis hirsuta hairy rockcress Brassicaceae Forb/herb PA (E), TN (SC) Arabis hirsuta var. pycnocarpa creamflower rockcress Brassicaceae Forb/herb NH (E), OH (E) Arabis hirsuta var. adpressipilis KY (E) Arabis holboellii var. retrofracta second rockcress Brassicaceae Forb/herb MN (T) Arabis laevigata smooth rockcress Brassicaceae Forb/herb MA (T), ME (T) Arabis lyrata lyrate rockcress Brassicaceae Forb/herb OH (T), VT (T) Arabidopsis lyrata MA (E) Arabis macdonaldiana MacDonald rockcress Brassicaceae Forb/herb Endangered CA (E) Arabis missouriensis green rockcress Brassicaceae Forb/herb KY (E), MA (T), MD (E), ME (T), NH (T), NY (T), PA (E), RI (SC) Arabis missouriensis var. deamii IN (E) Arabis patens spreading rockcress Brassicaceae Forb/herb IN (E), OH (E), TN (E) Arabis perstellata Braun's rockcress Brassicaceae Forb/herb Endangered KY (T), MI (T), TN (E) Arabis serotina shale barren rockcress Brassicaceae Forb/herb Endangered VA (E) Arabis shortii Short's rockcress Brassicaceae Forb/herb MD (T), NY (E), TN (SC) Aralia hispida bristly sarsaparilla Araliaceae Subshrub, IN (E), MD (E), Forb/herb OH (E) Aralia racemosa American spikenard Araliaceae Subshrub, RI (SC) Forb/herb Arceuthobium pusillum eastern dwarf Subshrub, Shrub CT (E), NJ (E), PA (T), RI (E) Arctomecon californica California bearpoppy Papaveraceae Forb/herb AZ (SR), NV (FP) Arctostaphylos alpina alpine bearberry Ericaceae Shrub ME (T), NH (T) Arctostaphylos bakeri Baker's manzanita Ericaceae Shrub CA (R) Arctostaphylos densiflora Vine Hill manzanita Ericaceae Subshrub, Shrub CA (E) Arctostaphylos edmundsii Little Sur manzanita Ericaceae Shrub CA () Arctostaphylos edmundsii var. parvifolia CA (R) Arctostaphylos hookeri ssp. hearstiorum Hearst's manzanita Ericaceae Subshrub, Shrub CA (R) Arctostaphylos hookeri ssp. ravenii Presidio manzanita Ericaceae Subshrub, Shrub Endangered CA (E) Arctostaphylos imbricata San Bruno Mountain manzanita Ericaceae Shrub CA (E) Arctostaphylos pacifica Pacific manzanita Ericaceae Shrub CA (E) Arctostaphylos pallida Alameda manzanita Ericaceae Shrub Threatened CA (E) Arctostaphylos uva-ursi kinnikinnick Ericaceae Subshrub, Shrub IA (E), IL (E), IN (R), OH (PRX), PA (X) Arenaria lanuginosa spreading sandwort Caryophyllaceae Forb/herb TN (E) Arenaria paludicola marsh sandwort Caryophyllaceae Forb/herb Endangered CA (E), WA (PX) Arethusa bulbosa dragon's mouth Orchidaceae Forb/herb CT (E), IN (X), MA (T), MD (E, X), NC (E), NH (E), NY (T), OH (E), PA (E), RI (E), VT (T) Argemone pleiacantha ssp. pinnatisecta southwestern pricklypoppy Papaveraceae Forb/herb Endangered NM (E) Argentina anserina silverweed cinquefoil Rosaceae Forb/herb IA (), IN (), PA () Potentilla anserina IA (T), IN (T), PA (T) Argentina egedii ssp. egedii Pacific silverweed Rosaceae Forb/herb NY () Potentilla anserina ssp. egedii NY (T) Argusia gnaphalodes sea rosemary Boraginaceae Shrub FL (E) Argythamnia blodgettii Blodgett's silverbush Euphorbiaceae Forb/herb FL (E) Arisaema dracontium green dragon Araceae Forb/herb MA (T), NH (E), NY (EV), VT (T) basiramea forked threeawn Poaceae Graminoid ME (SC) Aristida dichotoma churchmouse threeawn Poaceae Graminoid MI (PREX) Aristida lanosa woollysheath threeawn Poaceae Graminoid MD (E), NJ (E) Aristida longespica slimspike threeawn Poaceae Graminoid RI (SC)

Aristida longispica CT (SC), MI (T) Aristida longespica var. geniculata slimspike threeawn Poaceae Graminoid IN (), NH (), OH () Aristida intermedia IN (R) Aristida longispica var. geniculata NH (E) Aristida necopina OH (E) Aristida purpurascens arrowfeather threeawn Poaceae Graminoid CT (SC), MA (T), PA (T), RI (T) Aristida purpurascens var. virgata arrowfeather threeawn Poaceae Graminoid MD () Aristida virgata MD (E) Aristida ramosissima s-curve threeawn Poaceae Graminoid KY (H), TN (E, PX) Aristida tuberculosa seaside threeawn Poaceae Graminoid CT (E), IN (R), MA (T), MI (T), NH (E) Aristolochia macrophylla pipevine Aristolochiaceae Vine MD (T) Aristolochia pentandra Marsh's dutchman's pipe Aristolochiaceae Vine, Forb/herb FL (E) Aristolochia serpentaria Virginia snakeroot Aristolochiaceae Forb/herb CT (T), IA (T), MI (T), NY (E) Aristolochia serpentaria var. hastata IL (T) Aristolochia tomentosa woolly dutchman's pipe Aristolochiaceae Vine FL (E) Arnica acaulis common leopardbane Asteraceae Forb/herb FL (E), MD (E), PA (E) Arnica cordifolia heartleaf arnica Asteraceae Forb/herb MI (E) Arnica lanceolata lanceleaf arnica Asteraceae Forb/herb ME (T), NH (T), NY (E) Arnica lonchophylla longleaf arnica Asteraceae Forb/herb MN (T) Arnoglossum album Bay County Indian plantain Asteraceae Forb/herb FL (E) Arnoglossum atriplicifolium pale Indian plantain Asteraceae Forb/herb NJ () Cacalia atriplicifolia NJ (E) Arnoglossum diversifolium variableleaf Indian plantain Asteraceae Forb/herb FL (T), GA (T) Arnoglossum plantagineum groovestem Indian plantain Asteraceae Forb/herb MN (T), TN (SC) Cacalia tuberosa WI (T) Arnoglossum reniforme great Indian plantain Asteraceae Forb/herb MD () Cacalia muehlenbergii MD (E, X) Aronia melanocarpa black chokeberry Rosaceae Shrub IA () Artemisia campestris field sagewort Asteraceae Forb/herb OH (T) Artemisia campestris ssp. borealis field sagewort Asteraceae Forb/herb MA (E), ME (PX), NY (E) Artemisia campestris ssp. borealis var. wormskioldii field sagewort Asteraceae Forb/herb OR (E), WA (E) Artemisia campestris ssp. caudata field sagewort Asteraceae Forb/herb NH (T), PA (E), RI (SC) Artemisia dracunculus tarragon Asteraceae Subshrub, IL (E) Forb/herb Artemisia ludoviciana white sagebrush Asteraceae Subshrub, MI (T) Forb/herb Asarum canadense Canadian wildginger Aristolochiaceae Forb/herb ME (T) amplexicaulis clasping milkweed Asclepiadaceae Forb/herb NH (T), RI (SC), VT (T) Asclepias curtissii Curtiss' milkweed Asclepiadaceae Forb/herb FL (E) Asclepias engelmanniana Engelmann's milkweed Asclepiadaceae Forb/herb IA (E) Asclepias exaltata poke milkweed Asclepiadaceae Forb/herb RI (SC) Asclepias hirtella green milkweed Asclepiadaceae Forb/herb MI (T), MN (T), TN (SC) Asclepias lanuginosa sidecluster milkweed Asclepiadaceae Forb/herb IA (T), IL (E), WI (T) Asclepias meadii Mead's milkweed Asclepiadaceae Forb/herb Threatened IA (E), IL (E), IN (RI), MO (E) Asclepias ovalifolia oval-leaf milkweed Asclepiadaceae Forb/herb IL (E), MI (E), WI (T) Asclepias purpurascens purple milkweed Asclepiadaceae Forb/herb CT (SC), MA (E), RI (H), TN (SC), WI (E) Asclepias quadrifolia fourleaf milkweed Asclepiadaceae Forb/herb NH (T), RI (T) Asclepias rubra red milkweed Asclepiadaceae Forb/herb MD (E), PA (X) Asclepias speciosa showy milkweed Asclepiadaceae Forb/herb IA (T) Asclepias stenophylla slimleaf milkweed Asclepiadaceae Subshrub, IA (E), IL (E), Forb/herb MN (E) Asclepias sullivantii prairie milkweed Asclepiadaceae Forb/herb MI (T), MN (T), WI (T) Asclepias tuberosa milkweed Asclepiadaceae Forb/herb ME (PX), NH (E), NY (EV), RI (SC), VT (T) Asclepias variegata redring milkweed Asclepiadaceae Forb/herb CT (E), NY (E), PA (E) Asclepias verticillata whorled milkweed Asclepiadaceae Forb/herb MA (T), RI (SC) Asclepias viridiflora green comet milkweed Asclepiadaceae Forb/herb CT (SC), FL (E), NY (T) Asclepias viridis green antelopehorn Asclepiadaceae Forb/herb IN (E) Asclepias viridula southern milkweed Asclepiadaceae Forb/herb FL (T) Asimina tetramera fourpetal pawpaw Annonaceae Shrub Endangered FL (E) Asimina triloba pawpaw Annonaceae Tree, Shrub NJ (E), NY (T) Asplenium bradleyi Bradley's spleenwort Aspleniaceae Forb/herb IL (E), IN (E), MD (E, X), NJ (E), NY (E), OH (T), PA (E) Asplenium erosum eared spleenwort Aspleniaceae Forb/herb FL () Asplenium auritum FL (E) Asplenium ×heteroresiliens spleenwort Aspleniaceae Forb/herb GA (T), NC (E) Asplenium monanthes singlesorus spleenwort Aspleniaceae Forb/herb FL (E), NC (E) Asplenium montanum mountain spleenwort Aspleniaceae Forb/herb CT (T), IN (E), MA (E), MI (PREX), NY (T), RI (E), VT (T) Asplenium pinnatifidum lobed spleenwort Aspleniaceae Forb/herb MD (E), NJ (E), PA (R), WI (T) Asplenium platyneuron ebony spleenwort Aspleniaceae Forb/herb ME (SC), NY (EV) Asplenium pumilum dwarf spleenwort Aspleniaceae Forb/herb FL (E) Asplenium resiliens blackstem spleenwort Aspleniaceae Forb/herb IL (E), IN (E), MD (E), OH (PRX), PA (E) Asplenium rhizophyllum walking fern Aspleniaceae Forb/herb ME (PX), MI (T), NY (EV), RI (E) Camptosorus rhizophyllus NH (E) Asplenium ruta-muraria wallrue Aspleniaceae Forb/herb CT (T), IN (T), MA (T), MI (E), NY (EV), OH (T) Asplenium scolopendrium var. americanum Hart's tonguefern Aspleniaceae Forb/herb Threatened MI (E), NY (T), TN (E) Asplenium serratum wild birdnest fern Aspleniaceae Forb/herb FL (E) Asplenium trichomanes maidenhair spleenwort Aspleniaceae Forb/herb MN (T), NY (EV), RI (SC) Asplenium trichomanes-dentatum toothed spleenwort Aspleniaceae Forb/herb FL () Asplenium dentatum FL (E) Asplenium trichomanes-ramosum brightgreen spleenwort Aspleniaceae Forb/herb ME (T), MI (T), NY (E), VT (T) Asplenium viride WI (E) Asplenium verecundum limestone spleenwort Aspleniaceae Forb/herb FL (E) Astilbe crenatiloba Roan Mountain false goat's beard Saxifragaceae Forb/herb TN (E, PX) Astragalus agnicidus Humboldt County milkvetch Fabaceae Forb/herb CA (E) Astragalus alpinus alpine milkvetch Fabaceae Forb/herb ME (SC), MN (E), WI (E) Astragalus applegatei Applegate's milkvetch Fabaceae Forb/herb Endangered OR (E) Astragalus arrectus Palouse milkvetch Fabaceae Forb/herb WA (S) Astragalus arthurii waha milkvetch Fabaceae Forb/herb WA (S) Astragalus bibullatus limestone glade milkvetch Fabaceae Forb/herb Endangered TN (E) Astragalus canadensis Canadian milkvetch Fabaceae Forb/herb MD (E), MI (T), VT (T) Astragalus clarianus Napa milkvetch Fabaceae Forb/herb Endangered Astragalus claranus CA (T) Astragalus cobrensis var. maguirei Maguire's milkvetch Fabaceae Forb/herb AZ (SR) Astragalus collinus var. laurentii Laurent's milkvetch Fabaceae Forb/herb OR (T) Astragalus columbianus Columbian milkvetch Fabaceae Forb/herb WA (T) Astragalus cottonii Cotton's milkvetch Fabaceae Forb/herb WA () Astragalus australis var. olympicus WA (T) Astragalus crassicarpus groundplum milkvetch Fabaceae Forb/herb WI (E) Astragalus crassicarpus var. trichocalyx groundplum milkvetch Fabaceae Forb/herb IL (E) Astragalus cremnophylax var. cremnophylax sentry milkvetch Fabaceae Forb/herb Endangered AZ (HS) Astragalus cremnophylax var. myriorrhaphis sentry milkvetch Fabaceae Forb/herb AZ (SR) Astragalus cusickii var. cusickii Cusick's milkvetch Fabaceae Forb/herb WA (S) Astragalus cusickii var. sterilis barren milkvetch Fabaceae Forb/herb OR (T) Astragalus diaphanus transparent milkvetch Fabaceae Forb/herb WA (PX) Astragalus diaphanus var. diurnus OR (T) Astragalus distortus Ozark milkvetch Fabaceae Forb/herb MD (T) Astragalus eucosmus elegant milkvetch Fabaceae Forb/herb ME (PX) Astragalus geyeri Geyer's milkvetch Fabaceae Forb/herb WA (S) Astragalus geyeri var. triquetrus Geyer's milkvetch Fabaceae Forb/herb NV (FP) Astragalus holmgreniorum Paradox milkvetch Fabaceae Forb/herb Endangered AZ (HS) Astragalus humillimus Mancos milkvetch Fabaceae Subshrub, Endangered NM (E) Forb/herb Astragalus hypoxylus Huachuca Mountain milkvetch Fabaceae Forb/herb AZ (SR) Astragalus johannis-howellii Long Valley milkvetch Fabaceae Subshrub, CA (R) Forb/herb Astragalus kentrophyta var. douglasii Douglas' spiny milkvetch Fabaceae Subshrub, WA (PX) Forb/herb Astragalus lentiginosus var. sesquimetralis Sodaville milkvetch Fabaceae Forb/herb CA (E), NV (FP) Astragalus magdalenae var. peirsonii Peirson's milkvetch Fabaceae Forb/herb Threatened CA (E) Astragalus michauxii sandhills milkvetch Fabaceae Forb/herb NC (T) Astragalus microcystis dwarf milkvetch Fabaceae Forb/herb WA (S) Astragalus misellus var. pauper pauper milkvetch Fabaceae Forb/herb WA (S) Astragalus mohavensis var. hemigyrus Mojave milkvetch Fabaceae Forb/herb NV (FP) Astragalus monoensis Mono milkvetch Fabaceae Forb/herb CA (R) Astragalus mulfordiae Mulford's milkvetch Fabaceae Forb/herb OR (E) Astragalus neglectus Cooper's milkvetch Fabaceae Forb/herb NY (E), OH (E), PA (E), WI (E) Astragalus nutriosensis Apache milkvetch Fabaceae Forb/herb AZ (SR) Astragalus peckii Peck's milkvetch Fabaceae Subshrub, OR (T) Forb/herb Astragalus phoenix Ash milkvetch Fabaceae Forb/herb Threatened NV (FP) Astragalus pulsiferae var. suksdorfii Suksdorf's milkvetch Fabaceae Forb/herb WA (E) Astragalus riparius woodyroot milkvetch Fabaceae Forb/herb WA (S) Astragalus robbinsii Robbins' milkvetch Fabaceae Forb/herb ME (PX) Astragalus robbinsii var. jesupii Jesup's milkvetch Fabaceae Forb/herb Endangered NH (E), VT (E) Astragalus sinuatus Whited's milkvetch Fabaceae Forb/herb WA (E) Astragalus tener var. titi coastal dunes milkvetch Fabaceae Forb/herb Endangered CA (E) Astragalus tennesseensis milkvetch Fabaceae Forb/herb IL (E), IN (RI), TN (SC) Astragalus traskiae Trask's milkvetch Fabaceae Forb/herb CA (R) Astragalus tyghensis Tygh Valley milkvetch Fabaceae Forb/herb OR (T) Astragalus xiphoides gladiator milkvetch Fabaceae Forb/herb AZ (SR) Astragalus yoder-williamsii Osgood Mountain milkvetch Fabaceae Forb/herb NV (FP) Astrophytum asterias sanddollar Cactaceae Shrub Endangered TX (E) Athyrium filix-femina common ladyfern Dryopteridaceae Forb/herb FL (T), NY (EV) Athyrium filix-femina ssp. angustum subarctic ladyfern Dryopteridaceae Forb/herb TN (SC) Atriplex glabriuscula Scotland orache Chenopodiaceae Forb/herb CT (SC), NY (E), RI (SC) Atriplex hymenelytra desertholly Chenopodiaceae Shrub AZ (SR) Atriplex subspicata saline saltbush Chenopodiaceae Forb/herb NJ (E), NY (E) Atriplex tularensis Tulare saltbush Chenopodiaceae Forb/herb CA (E) Aureolaria grandiflora var. pulchra largeflower yellow false foxglove Scrophulariaceae Forb/herb IN (X) Aureolaria patula spreading yellow false foxglove Scrophulariaceae Forb/herb KY (SC), TN (T) Aureolaria pedicularia fernleaf yellow false foxglove Scrophulariaceae Forb/herb IA (E), ME (SC), MN (T) Aureolaria pedicularia var. ambigens fernleaf yellow false foxglove Scrophulariaceae Forb/herb OH (E) Aureolaria pedicularia var. intercedens fernleaf yellow false foxglove Scrophulariaceae Forb/herb NH (E) Aureolaria pedicularia var. pedicularia fernleaf yellow false foxglove Scrophulariaceae Forb/herb OH (E) Aureolaria virginica downy yellow false foxglove Scrophulariaceae Forb/herb NH (T) Axonopus furcatus big carpetgrass Poaceae Graminoid MD (E, X) Ayenia limitaris Rio Grande ayenia Sterculiaceae Subshrub, Shrub Endangered TX (E) Azolla caroliniana Carolina mosquitofern Azollaceae Forb/herb IN (T), NY (EV) Baccharis dioica broombush false Asteraceae Shrub FL (E) Baccharis halimifolia eastern baccharis Asteraceae Tree, Shrub PA (R) Baccharis vanessae Encinitis false willow Asteraceae Shrub Threatened CA (E) Bacopa innominata tropical waterhyssop Scrophulariaceae Forb/herb MD (E, X), VA (E) Bacopa rotundifolia disk waterhyssop Scrophulariaceae Forb/herb IN (E) Balduina atropurpurea purpledisk honeycombhead Asteraceae Forb/herb FL (E), GA (R) Baptisia arachnifera cobwebby wild indigo Fabaceae Forb/herb Endangered GA (E) Baptisia australis blue wild indigo Fabaceae Forb/herb IN (T), MD (T), OH (E) Baptisia australis var. minor blue wild indigo Fabaceae Forb/herb KY (SC) Baptisia minor NC (T) Baptisia bracteata var. leucophaea longbract wild indigo Fabaceae Forb/herb KY (SC), TN (SC) Baptisia leucophaea MI (E) Baptisia calycosa wild indigo Fabaceae Forb/herb FL (E) Baptisia calycosa var. villosa Florida wild indigo Fabaceae Forb/herb FL () Baptisia hirsuta FL (T) Baptisia megacarpa Apalachicola wild indigo Fabaceae Forb/herb FL (E) Baptisia simplicifolia scareweed Fabaceae Forb/herb FL (T) Baptisia tinctoria horseflyweed Fabaceae Forb/herb KY (T), ME (E) Barbarea orthoceras American yellowrocket Brassicaceae Forb/herb ME (PX), NH (E) Bartonia paniculata twining screwstem Vine, Forb/herb IL (E), ME (T), MI (T), NY (E) Bartonia virginica yellow screwstem Gentianaceae Forb/herb KY (T), MN (E) Basiphyllaea corallicola Carter's orchid Orchidaceae Forb/herb FL (E) Beckmannia syzigachne American sloughgrass Poaceae Graminoid IL (E), MI (T) Beloglottis costaricensis Costa Rican lady's tresses Orchidaceae Forb/herb FL () Spiranthes costaricensis FL (E) Bensoniella oregona Bensoniella Saxifragaceae Forb/herb CA (R) Berberis canadensis American barberry Berberidaceae Shrub IL (E), IN (E), KY (E), MD (E, X), PA (X), TN (SC) Berchemia scandens supplejack Rhamnaceae Vine IL (E), KY (T) Berula erecta cutleaf waterparsnip Apiaceae Forb/herb IA (T), MI (T) Besseya bullii Bull's coraldrops Scrophulariaceae Forb/herb IA (T), IL (T), IN (E), MI (T), MN (T), OH (PRX), WI (T) Betula alleghaniensis yellow birch Betulaceae Tree IL (E) Betula glandulosa resin birch Betulaceae Shrub, Subshrub ME (E), NH (T), NY (E) Betula minor dwarf white birch Betulaceae Subshrub, Shrub ME (E), NY (E) Betula nigra river birch Betulaceae Tree NH (T) Betula papyrifera var. cordifolia mountain paper birch Betulaceae Tree TN (E) Betula populifolia gray birch Betulaceae Tree IL (E), IN (X) Betula pumila bog birch Betulaceae Shrub CT (SC), IA (T), MA (E), ME (SC), NH (E), NY (T), OH (T) Betula pumila var. glandulifera bog birch Betulaceae Shrub VT (E) Betula uber Virginia roundleaf birch Betulaceae Tree Threatened VA (E) Bidens beckii Beck's water-marigold Asteraceae Forb/herb IL (E), IN (E), NJ (E) Megalodonta beckii CT (T), IA (E), OH (PRX), PA (E) Megalodonta beckii var. beckii NY (T) Bidens bidentoides Delmarva beggarticks Asteraceae Forb/herb NY (R), PA (E) Bidens connata purplestem beggarticks Asteraceae Forb/herb RI (SC) Bidens coronata crowned beggarticks Asteraceae Forb/herb RI (SC) Bidens discoidea small beggarticks Asteraceae Forb/herb NH (E) Bidens eatonii Eaton's beggarticks Asteraceae Forb/herb CT (SC), MA (E), ME (T), NJ (E) Bidens hyperborea estuary beggarticks Asteraceae Forb/herb ME (SC), NY (E) Bidens hyperborea var. hyperborea estuary beggarticks Asteraceae Forb/herb MA () Bidens hyperborea var. colpophila MA (E) Bidens laevis smooth beggartick Asteraceae Forb/herb NY (T) Bidens mitis smallfruit beggarticks Asteraceae Forb/herb MD (E) Bigelowia nuttallii Nuttall's rayless goldenrod Asteraceae Forb/herb FL (E) Blechnum occidentale hammock fern Blechnaceae Forb/herb FL (E) Blennosperma bakeri Baker's stickyseed Asteraceae Forb/herb Endangered CA (E) Blennosperma nanum var. robustum common stickyseed Asteraceae Forb/herb CA (R) Blephilia ciliata downy pagoda-plant Lamiaceae Forb/herb CT (SC), IA (T), MA (E), NY (E) Blephilia hirsuta hairy pagoda-plant Lamiaceae Forb/herb CT (SC), MA (E), VT (T) Bletia purpurea pinepink Orchidaceae Forb/herb FL (T) humilis dwarf goldenstar Liliaceae Forb/herb CA (R) Bolandra oregana northern false coolwort Saxifragaceae Forb/herb WA (S) Bolboschoenus fluviatilis river bulrush Cyperaceae Graminoid KY (), MA (SC), PA (), TN () Scirpus fluviatilis KY (E), PA (R), TN (SC) Bolboschoenus maritimus cosmopolitan bulrush Cyperaceae Graminoid CT (), IL (), NJ (), NY (), RI () Scirpus maritimus NJ (E), NY (E), RI (SC) Scirpus paludosus IL (E) Scirpus paludosus var. atlanticus CT (SC) Bolboschoenus novae-angliae New England bulrush Cyperaceae Graminoid CT (), ME (PX), NY () Scirpus cylindricus CT (SC) Scirpus novae-angliae NY (E) Bolboschoenus robustus sturdy bulrush Cyperaceae Graminoid NH () Scirpus robustus NH (T) Boltonia asteroides white doll's daisy Asteraceae Forb/herb MD (E), PA (E) Boltonia decurrens claspingleaf doll's daisy Asteraceae Forb/herb Threatened IL (T), MO (E) Bonamia grandiflora Florida lady's nightcap Convolvulaceae Vine, Forb/herb Threatened FL (E) Borrichia frutescens bushy seaside tansy Asteraceae Subshrub MD (E, X) Botrychium acuminatum tailed grapefern Ophioglossaceae Forb/herb MI (E) Botrychium ascendens trianglelobe moonwort Ophioglossaceae Forb/herb WA (S) Botrychium biternatum sparselobe grapefern Ophioglossaceae Forb/herb IL (T), OH (T) Botrychium campestre moonwort Ophioglossaceae Forb/herb MI (T), NY (E), WA (S) Botrychium crenulatum scalloped moonwort Ophioglossaceae Forb/herb WA (S) Botrychium dissectum cutleaf grapefern Ophioglossaceae Forb/herb NY (EV) Botrychium gallicomontanum Frenchman's Bluff grapefern Ophioglossaceae Forb/herb MN (E) Botrychium hesperium western moonwort Ophioglossaceae Forb/herb MI (T), WA (S) Botrychium jenmanii Dixie grapefern Ophioglossaceae Forb/herb TN (T) Botrychium lanceolatum lanceleaf grapefern Ophioglossaceae Forb/herb MD (E, X), MN (T), NY (EV), OH (PRX) Botrychium lanceolatum var. angustisegmentum lanceleaf grapefern Ophioglossaceae Forb/herb RI () Botrychium lanceolatum ssp. angustisegmentum RI (SC) Botrychium lineare narrowleaf grapefern Ophioglossaceae Forb/herb WA (S) Botrychium lunaria common moonwort Ophioglossaceae Forb/herb ME (E), MN (T), NY (E), VT (E), WA (S), WI (E) Botrychium matricariifolium matricary grapefern Ophioglossaceae Forb/herb IA (E), IL (E), IN (T), KY (E), NY (EV), RI (SC), TN (SC) Botrychium minganense Mingan moonwort Ophioglossaceae Forb/herb NY (E) Botrychium mormo little goblin moonwort Ophioglossaceae Forb/herb MI (T), WI (E) Botrychium multifidum leathery grapefern Ophioglossaceae Forb/herb IA (T), IL (E), MD (E, X), NJ (E), NY (EV), OH (T) Botrychium multifidum var. intermedium IN (X) Botrychium oneidense bluntlobe grapefern Ophioglossaceae Forb/herb KY (E), MD (E), MN (E), NY (E), TN (SC) Botrychium pallidum pale botrychium Ophioglossaceae Forb/herb MN (E) Botrychium paradoxum peculiar moonwort Ophioglossaceae Forb/herb WA (S) Botrychium pedunculosum stalked moonwort Ophioglossaceae Forb/herb WA (S) Botrychium pumicola Crater Lake grapefern Ophioglossaceae Forb/herb OR (T) Botrychium rugulosum ternate grapefern Ophioglossaceae Forb/herb MN (T), NY (E) Botrychium simplex little grapefern Ophioglossaceae Forb/herb CT (SC), IA (T), IL (E), IN (E), MD (E, X), NY (EV), OH (E), RI (SC), WA (S) Botrychium virginianum rattlesnake fern Ophioglossaceae Forb/herb NY (EV) Bourreria cassinifolia smooth strongbark Boraginaceae Tree, Shrub FL (E) Bourreria radula rough strongbark Boraginaceae Tree, Shrub FL (E) Bourreria succulenta bodywood Boraginaceae Tree, Shrub FL (E) Bouteloua curtipendula sideoats grama Poaceae Graminoid CT (E), KY (SC), MI (T), NJ (E), NY (E), PA (T) Bouteloua gracilis blue grama Poaceae Graminoid IL (E) Bouteloua hirsuta hairy grama Poaceae Graminoid AR (E) Bouteloua rigidiseta grama Poaceae Graminoid AR (E) Boykinia aconitifolia Allegheny brookfoam Saxifragaceae Forb/herb KY (T) Brachyelytrum aristosum northern shorthusk Poaceae Graminoid TN () Brachyelytrum erectum var. septentrionale TN (SC) Brassia caudata cricket orchid Orchidaceae Forb/herb FL (E) Brickellia cordifolia Flyr's brickellbush Asteraceae Subshrub, FL (E) Forb/herb Brickellia eupatorioides var. eupatorioides false boneset Asteraceae Subshrub, NJ () Forb/herb Kuhnia eupatorioides NJ (E) Brickellia eupatorioides var. floridana false boneset Asteraceae Subshrub, FL () Forb/herb Brickellia mosieri FL (E) Brodiaea coronaria ssp. rosea Indian Valley brodiaea Liliaceae Forb/herb CA (E) Brodiaea filifolia threadleaf brodiaea Liliaceae Forb/herb Threatened CA (E) Brodiaea insignis Kaweah brodiaea Liliaceae Forb/herb CA (E) Brodiaea pallida Chinese Camp brodiaea Liliaceae Forb/herb Threatened CA (E) Bromus ciliatus fringed brome Poaceae Graminoid MD (E, X) Bromus inermis ssp. pumpellianus var. pumpellianus Pumpelly's brome Poaceae Graminoid MI () Bromus pumpellianus MI (T) Bromus kalmii arctic brome Poaceae Graminoid MD (E), ME (PX), NH (E) Bromus latiglumis earlyleaf brome Poaceae Graminoid MD (E) Bromus nottowayanus Nottoway Valley brome Poaceae Graminoid MD (E, X) Bromus pubescens hairy woodland brome Poaceae Graminoid ME (PX), NH (T) Buchnera americana American bluehearts Scrophulariaceae Forb/herb IN (E), MD (E, X), MI (PREX), NY (E), OH (T), PA (X) Buckleya distichophylla piratebush Shrub NC (E), TN (T), VA (E) Bulbophyllum pachyrachis rat-tail orchid Orchidaceae Forb/herb FL (E) Bulbostylis ciliatifolia var. coarctata capillary hairsedge Cyperaceae Graminoid TN (E, PX) Burmannia flava Fahkahatchee bluethread Burmanniaceae Forb/herb FL (E) Bursera fagaroides fragrant bursera Burseraceae Tree, Shrub AZ (SR) Byrsonima lucida Long Key locustberry Malpighiaceae Tree, Shrub FL (T) Cabomba caroliniana Carolina fanwort Cabombaceae Forb/herb IN (X), KY (T) Caesalpinia major Hawai'i pearls Fabaceae Shrub, Vine FL (E) Caesalpinia pauciflora fewflower holdback Fabaceae Vine, Shrub FL (E) Cakile edentula American searocket Brassicaceae Forb/herb IL (T), PA (R) Calamagrostis cainii Cain's reedgrass Poaceae Graminoid NC (E), TN (E) Calamagrostis canadensis var. macouniana Macoun's reedgrass Poaceae Graminoid KY (E) Calamagrostis coarctata Nuttall's reedgrass Poaceae Graminoid ME () Calamagrostis cinnoides ME (SC) Calamagrostis foliosa leafy reedgrass Poaceae Graminoid CA (R) Calamagrostis perplexa wood reedgrass Poaceae Graminoid NY (E) Calamagrostis pickeringii Pickering's reedgrass Poaceae Graminoid MA (E), ME (T), NH (T), NJ (E) Calamagrostis porteri Porter's reedgrass Poaceae Graminoid MD (E), TN (E) Calamagrostis porteri ssp. insperata Porter's reedgrass Poaceae Graminoid AR (E), IN (T), KY (E), OH (E) Calamagrostis insperata IL (E) Calamagrostis porteri ssp. porteri Porter's reedgrass Poaceae Graminoid KY (T), NY (E) Calamagrostis stricta slimstem reedgrass Poaceae Graminoid MI (T) Calamagrostis stricta ssp. inexpansa northern reedgrass Poaceae Graminoid CT (SC), ME (E), NH (E), NY (T), VT (E) Calamagrostis lacustris MI (T), NH (T) Calamagrostis stricta ssp. stricta slimstem reedgrass Poaceae Graminoid ME (T), NY (E) Calamovilfa arcuata Cumberland sandreed Poaceae Graminoid TN (E) Calamovilfa curtissii Florida sandreed Poaceae Graminoid FL (T) Calamovilfa longifolia var. magna prairie sandreed Poaceae Graminoid WI (T) Calla palustris water arum Araceae Forb/herb IL (E), IN (E), MD (E) Callicarpa americana American beautyberry Verbenaceae Shrub MD (E, X) Callirhoe alcaeoides light poppymallow Forb/herb IA (T), KY (H) Callirhoe papaver woodland poppymallow Malvaceae Forb/herb FL (E) Callirhoe scabriuscula Texas poppymallow Malvaceae Forb/herb Endangered TX (E) Callirhoe triangulata clustered poppymallow Malvaceae Forb/herb IA (E), IN (X) Callitriche hermaphroditica northern water-starwort Callitrichaceae Forb/herb NY (E) Callitriche heterophylla twoheaded water-starwort Callitrichaceae Forb/herb MI (T), WI (T) Callitriche palustris vernal water-starwort Callitrichaceae Forb/herb OH () Callitriche verna OH (T) Callitriche terrestris terrestrial water-starwort Callitrichaceae Forb/herb NY (T) incense cedar Cupressaceae Tree NV (CY) ambiguus doubting mariposa lily Liliaceae Forb/herb AZ (SR) Calochortus aureus golden mariposa lily Liliaceae Forb/herb AZ (SR) Cox's mariposa lily Liliaceae Forb/herb OR (E) Calochortus dunnii Dunn's mariposa lily Liliaceae Forb/herb CA (R) Calochortus flexuosus winding mariposa lily Liliaceae Vine, Forb/herb AZ (SR) Calochortus gunnisonii Gunnison's mariposa lily Liliaceae Forb/herb AZ (SR) Calochortus howellii Howell's mariposa lily Liliaceae Forb/herb OR (T) Calochortus indecorus Sexton Mountain mariposa lily Liliaceae Forb/herb OR (E) Calochortus kennedyi var. kennedyi desert mariposa lily Liliaceae Forb/herb, Vine AZ (SR) Calochortus kennedyi var. munzii desert mariposa lily Liliaceae Forb/herb, Vine AZ (SR) Calochortus longebarbatus var. longebarbatus longbeard mariposa lily Liliaceae Forb/herb WA (S) Calochortus macrocarpus var. maculosus Nez Perce mariposa lily Liliaceae Forb/herb WA (S) Calochortus nitidus broadfruit mariposa lily Liliaceae Forb/herb WA (T) Calochortus persistens Siskiyou mariposa lily Liliaceae Forb/herb CA (R) Calochortus tiburonensis Tiburon mariposa lily Liliaceae Forb/herb Threatened CA (T) Calochortus umpquaensis Umpqua mariposa lily Liliaceae Forb/herb OR (E) Calopogon multiflorus manyflower grasspink Orchidaceae Forb/herb FL (E), NC (E) Calopogon tuberosus tuberous grasspink Orchidaceae Forb/herb IL (E), KY (E), MD (E), NY (EV), RI (SC) Caltha natans floating marsh marigold Ranunculaceae Forb/herb MN (E), WI (E) Caltha palustris yellow marsh marigold Ranunculaceae Forb/herb TN (E) Calycanthus floridus eastern sweetshrub Calycanthaceae Shrub FL (E) Calycanthus floridus var. glaucus eastern sweetshrub Calycanthaceae Shrub KY (T) Calycanthus fertilis OH (PRX) Calycocarpum lyonii cupseed Menispermaceae Vine IN (T) Calydorea coelestina Bartram's ixia Forb/herb FL () Sphenostigma coelestinum FL (E) Calylophus serrulatus yellow sundrops Subshrub, KY (H) Forb/herb Calypso bulbosa fairy slipper Orchidaceae Forb/herb MI (T), NH (E), NY (E), VT (T), WI (T) Calypso bulbosa var. americana fairy slipper Orchidaceae Forb/herb AZ (SR) Calyptranthes pallens pale lidflower Myrtaceae Tree, Shrub FL (T) Calyptranthes zuzygium myrtle of the river Myrtaceae Tree, Shrub FL (E) Calystegia catesbeiana Catesby's false bindweed Convolvulaceae Forb/herb, Vine FL (E) Calystegia sepium ssp. erratica hedge false bindweed Convolvulaceae Vine, Forb/herb NJ (E) Calystegia spithamaea low false bindweed Convolvulaceae Vine, Forb/herb CT (SC), MA (E), ME (T), NJ (E), VT (T) Calystegia spithamaea ssp. spithamaea low false bindweed Convolvulaceae Vine, Forb/herb NH () Convolvulus spithamaeus NH (T) Calystegia stebbinsii Stebbins' false bindweed Convolvulaceae Vine, Forb/herb Endangered CA (E) Camassia angusta prairie camas Liliaceae Forb/herb IL (E), IN (E) Camassia scilloides Atlantic camas Liliaceae Forb/herb MI (T), NC (T), PA (E), WI (E) Camissonia exilis Cottonwood Springs suncup Onagraceae Forb/herb AZ (SR) Camissonia pygmaea dwarf suncup Onagraceae Forb/herb WA (T) Camissonia scapoidea Paiute suncup Onagraceae Forb/herb WA (S) Campanula aparinoides marsh bellflower Forb/herb TN (T) Campanula divaricata small bonny bellflower Campanulaceae Forb/herb MD (E, X) Campanula lasiocarpa mountain harebell Campanulaceae Forb/herb WA (S) Campanula robinsiae Robins' bellflower Campanulaceae Forb/herb Endangered FL (E) Campanula rotundifolia bluebell bellflower Campanulaceae Forb/herb NY (EV), OH (E) Campylocentrum pachyrrhizum leafless bentspur orchid Orchidaceae Forb/herb FL (E) Campyloneurum angustifolium narrow strapfern Polypodiaceae Forb/herb FL (E) Campyloneurum costatum tailed strapfern Polypodiaceae Forb/herb FL (E) Canadanthus modestus giant mountain aster Asteraceae Forb/herb MI () Aster modestus MI (T) Canella winterana wild cinnamon Canellaceae Tree, Shrub FL (E) Cardamine bellidifolia alpine bittercress Brassicaceae Forb/herb ME (E), NH (E) Cardamine bulbosa bulbous bittercress Brassicaceae Forb/herb NH (E) Cardamine clematitis small mountain bittercress Brassicaceae Forb/herb TN (T) Cardamine concatenata cutleaf toothwort Brassicaceae Forb/herb ME (E) Dentaria laciniata NH (E) Cardamine dissecta forkleaf toothwort Brassicaceae Forb/herb IN () Dentaria multifida IN (E) Cardamine douglassii limestone bittercress Brassicaceae Forb/herb CT (SC), MA (E) Cardamine flagellifera Blue Ridge bittercress Brassicaceae Forb/herb TN (T) Cardamine longii Long's bittercress Brassicaceae Forb/herb CT (SC), MA (E), MD (E), ME (T), NH (T), NJ (E), NY (T) Cardamine maxima large toothwort Brassicaceae Forb/herb ME (PX), NJ (E) Dentaria maxima MI (T) Cardamine micranthera streambank bittercress Brassicaceae Forb/herb Endangered NC (E) Cardamine pratensis var. pratensis cuckoo Brassicaceae Forb/herb IL (), MA (), NH (), OH () Cardamine pratensis var. palustris IL (E), MA (T), NH (E), OH (E) Cardamine rotundifolia American bittercress Brassicaceae Forb/herb NJ (E), NY (E), TN (SC) Carex abscondita thicket sedge Cyperaceae Graminoid NY (T) Carex adusta lesser brown sedge Cyperaceae Graminoid ME (E), PA (X) Carex ×aestivaliformis sedge Cyperaceae Graminoid TN (E) Carex aestivalis summer sedge Cyperaceae Graminoid CT (SC), KY (E), MD (E) Carex aggregata glomerate sedge Cyperaceae Graminoid NY (E) Carex alata broadwing sedge Cyperaceae Graminoid CT (E), IL (E), KY (T), PA (T), RI (SC) Carex albicans whitetinge sedge Cyperaceae Graminoid RI (SC) Carex albicans var. australis stellate sedge Cyperaceae Graminoid IL () Carex physorhyncha IL (E) Carex albolutescens greenwhite sedge Cyperaceae Graminoid MI (T), OH (T) Carex albursina white bear sedge Cyperaceae Graminoid NJ (E) Carex alopecoidea foxtail sedge Cyperaceae Graminoid CT (SC), IN (E), MA (T), ME (PX), NJ (E), OH (E), TN (E, PX) Carex amphibola eastern narrowleaf sedge Cyperaceae Graminoid NJ (E), NY (E) Carex anthoxanthea grassyslope arctic sedge Cyperaceae Graminoid WA (S) Carex appalachica Appalachian sedge Cyperaceae Graminoid KY (T) Carex aquatilis water sedge Cyperaceae Graminoid NJ (E), PA (T) Carex aquatilis var. aquatilis water sedge Cyperaceae Graminoid CT () Carex aquatilis var. altior CT (SC) Carex arcta northern cluster sedge Cyperaceae Graminoid NY (E), VT (E) Carex arctata drooping woodland sedge Cyperaceae Graminoid IN (E), NJ (E), OH (E) Carex argyrantha hay sedge Cyperaceae Graminoid TN (T) Carex arkansana sedge Cyperaceae Graminoid IL (E) Carex assiniboinensis Assiniboia sedge Cyperaceae Graminoid MI (T) Carex atherodes wheat sedge Cyperaceae Graminoid IN (E), ME (E), NY (E), PA (E) Carex atlantica ssp. atlantica prickly bog sedge Cyperaceae Graminoid IN (T) Carex atlantica ssp. capillacea prickly bog sedge Cyperaceae Graminoid IN (E), KY (E) Carex atratiformis scrabrous black sedge Cyperaceae Graminoid ME (SC), MI (T), NY (E), VT (T) Carex atrosquama lesser blackscale sedge Cyperaceae Graminoid WA (S) Carex aurea golden sedge Cyperaceae Graminoid IL (E), IN (R), NH (T), PA (E) Carex austrocaroliniana tarheel sedge Cyperaceae Graminoid KY (SC) Carex backii Back's sedge Cyperaceae Graminoid CT (E), MA (E), ME (E), NJ (E), NY (T), PA (X) Carex baileyi Bailey's sedge Cyperaceae Graminoid CT (SC), MA (E), ME (SC), NH (T) Carex baltzellii Baltzell's sedge Cyperaceae Graminoid FL (T), GA (E) Carex barrattii Barratt's sedge Cyperaceae Graminoid CT (E), NC (E), NY (E), PA (X), TN (E) Carex bebbii Bebb's sedge Cyperaceae Graminoid IN (T), NH (T), PA (E) Carex bicknellii Bicknell's sedge Cyperaceae Graminoid ME (PX), NY (T), OH (T), PA (E) Carex bigelowii Bigelow's sedge Cyperaceae Graminoid ME (SC), NY (T) Carex biltmoreana stiff sedge Cyperaceae Graminoid GA (T) Carex bromoides ssp. brome-like sedge Cyperaceae Graminoid TN () Carex bromoides var. montana TN (T) Carex brunnescens brownish sedge Cyperaceae Graminoid IL (E), IN (E), NJ (E), OH (T) Carex bullata button sedge Cyperaceae Graminoid NH (E), NY (E), PA (E) Carex bushii Bush's sedge Cyperaceae Graminoid CT (SC), IN (E), MA (E), ME (PX), NJ (E), OH (E) Carex buxbaumii Buxbaum's sedge Cyperaceae Graminoid CT (E), KY (H), MD (T), NH (E), NY (T), PA (R), RI (SC), TN (SC), VT (E), WA (S) Carex canescens ssp. disjuncta silvery sedge Cyperaceae Graminoid IL () Carex canescens var. disjuncta IL (E) Carex capillaris hair-like sedge Cyperaceae Graminoid ME (T), NH (T), NY (E), VT (T), WA (S) Carex capitata ssp. arctogena capitate sedge Cyperaceae Graminoid NH (T) Carex careyana Carey's sedge Cyperaceae Graminoid MD (E), MN (T), PA (E), WI (T) Carex caroliniana Carolina sedge Cyperaceae Graminoid NY (E) Carex castanea chestnut sedge Cyperaceae Graminoid CT (E), MA (E), NH (E) Carex cephaloidea thinleaf sedge Cyperaceae Graminoid OH (E) Carex sparganioides var. cephaloidea IN (T) Carex chapmanii Chapman's sedge Cyperaceae Graminoid FL (T), TN (T) Carex chordorrhiza creeping sedge Cyperaceae Graminoid IA (E), IL (E), IN (E), MA (E), NY (T), PA (X), VT (E), WA (S) Carex circinata coiled sedge Cyperaceae Graminoid WA (S) Carex collinsii Collins' sedge Cyperaceae Graminoid CT (SC), NY (E), PA (T), RI (H) Carex communis fibrousroot sedge Cyperaceae Graminoid IL (T) Carex comosa longhair sedge Cyperaceae Graminoid KY (H), TN (T), WA (S) Carex concinna low northern sedge Cyperaceae Graminoid WI (T) Carex conjuncta soft fox sedge Cyperaceae Graminoid MD (E), MI (T), MN (T), NY (E) Carex conoidea openfield sedge Cyperaceae Graminoid IN (E), MD (E), NC (T), OH (T) Carex katahdinensis MN (T) Carex crawei Crawe's sedge Cyperaceae Graminoid CT (T), IN (T), KY (SC), ME (E), NJ (E), NY (T) Carex crawfordii Crawford's sedge Cyperaceae Graminoid CT (SC), IL (E), PA (E) Carex crebriflora coastal plain sedge Cyperaceae Graminoid KY (T) Carex crinita var. brevicrinis fringed sedge Cyperaceae Graminoid PA (E) Carex crus-corvi ravenfoot sedge Cyperaceae Graminoid MI (T), OH (T), WI (E) Carex cryptolepis northeastern sedge Cyperaceae Graminoid IL (E), PA (E) Carex cumulata clustered sedge Cyperaceae Graminoid CT (E), IN (E), NH (T), NJ (E), NY (T), RI (SC) Carex dasycarpa sandywoods sedge Cyperaceae Graminoid GA (R) Carex davisii Davis' sedge Cyperaceae Graminoid CT (E), MA (E), MD (E, X), MN (T), NY (T), TN (SC) Carex debilis var. rudgei white edge sedge Cyperaceae Graminoid IN (T) Carex decomposita cypressknee sedge Cyperaceae Graminoid IL (E), IN (T), KY (T), MD (E, X), MI (PREX), NY (E), OH (E) Carex densa dense sedge Cyperaceae Graminoid WA (S) Carex deweyana Dewey sedge Cyperaceae Graminoid NJ (E), OH (PRX) Carex diandra lesser panicled sedge Cyperaceae Graminoid MD (E), NH (E), PA (T) Carex disperma softleaf sedge Cyperaceae Graminoid IL (E), IN (E), OH (E), PA (R) Carex duriuscula needleleaf sedge Cyperaceae Graminoid WA () Carex eleocharis WA (S) Carex eburnea bristleleaf sedge Cyperaceae Graminoid IN (R), MD (E), ME (E), NH (E), PA (E) Carex echinata star sedge Cyperaceae Graminoid IL (E), IN (E), OH (E) Carex echinata ssp. echinata star sedge Cyperaceae Graminoid TN (SC) Carex emoryi Emory's sedge Cyperaceae Graminoid NY (E) Carex exilis coastal sedge Cyperaceae Graminoid CT (E), MD (E), NC (T), NH (T), RI (SC), WI (T) Carex festucacea fescue sedge Cyperaceae Graminoid MN (T) Carex flava yellow sedge Cyperaceae Graminoid IN (T), PA (T), WA (S) Carex folliculata northern long sedge Cyperaceae Graminoid IN (T) Carex formosa handsome sedge Cyperaceae Graminoid CT (T), MA (T), MN (E), NJ (E), NY (T), OH (PRX), PA (E), WI (T) Carex frankii Frank's sedge Cyperaceae Graminoid NY (E) Carex garberi elk sedge Cyperaceae Graminoid IL (E), IN (T), ME (SC), MN (T), NY (E), OH (E), PA (E), VT (T), WI (T) Carex garberi var. bifaria NH (E) Carex geyeri Geyer's sedge Cyperaceae Graminoid PA (E) Carex gigantea giant sedge Cyperaceae Graminoid IL (E), IN (E), KY (T) Carex glaucescens southern waxy sedge Cyperaceae Graminoid MD (E) Carex glaucodea blue sedge Cyperaceae Graminoid MA (E) Carex flaccosperma var. glaucodea NH (E), NY (E) Carex gracilescens slender looseflower sedge Cyperaceae Graminoid MA (E) Carex granularis limestone meadow sedge Cyperaceae Graminoid NH () Carex granularis var. haleana NH (E) Carex gravida heavy sedge Cyperaceae Graminoid IN (E), MI (PREX), TN (SC) Carex grayi Gray's sedge Cyperaceae Graminoid MA (T) Carex grisea inflated narrow-leaf sedge Cyperaceae Graminoid ME (SC) Carex gynocrates northern bog sedge Cyperaceae Graminoid ME (SC), NY (E) Carex dioica ssp. gynocrates WA (S) Carex haydenii Hayden's sedge Cyperaceae Graminoid MI (PREX), NJ (E), NY (E), OH (PRX) Carex heleonastes Hudson Bay sedge Cyperaceae Graminoid MI (E) Carex heteroneura different-nerve sedge Cyperaceae Graminoid WA (S) Carex hirsutella fuzzy wuzzy sedge Cyperaceae Graminoid CT (SC), NH (E)

Carex hirtifolia pubescent sedge Cyperaceae Graminoid TN (SC) Carex hitchcockiana Hitchcock's sedge Cyperaceae Graminoid CT (SC), MA (SC), MD (E), NY (T), TN (T) Carex hormathodes marsh straw sedge Cyperaceae Graminoid NY (T) Carex houghtoniana Houghton's sedge Cyperaceae Graminoid NY (T) Carex hyalina tissue sedge Cyperaceae Graminoid TN (SC) Carex hyalinolepis shoreline sedge Cyperaceae Graminoid PA (X) Carex hystericina bottlebrush sedge Cyperaceae Graminoid KY (H), MD (E), WA (S) Carex intumescens greater bladder sedge Cyperaceae Graminoid IL (T) Carex jamesii James' sedge Cyperaceae Graminoid MN (T), NJ (E), NY (T) Carex joorii cypress swamp sedge Cyperaceae Graminoid KY (E), NJ (E) Carex juniperorum juniper sedge Cyperaceae Graminoid KY (E), OH (T) Carex lacustris hairy sedge Cyperaceae Graminoid MD (T), TN (T) Carex laevivaginata smoothsheath sedge Cyperaceae Graminoid ME (SC), MN (T) Carex lasiocarpa woollyfruit sedge Cyperaceae Graminoid PA (R) Carex latebracteata Waterfall's sedge Cyperaceae Graminoid AR (T) Carex laxiculmis spreading sedge Cyperaceae Graminoid ME (E), MN (T) Carex laxiflora var. serrulata broad looseflower sedge Cyperaceae Graminoid NY (E) Carex lemmonii Lemmon's sedge Cyperaceae Graminoid Endangered CA (E) Carex albida Endangered CA (E) Carex lenticularis lakeshore sedge Cyperaceae Graminoid MA (T), WI (T) Carex leptonervia nerveless woodland sedge Cyperaceae Graminoid IN (E), KY (E), MD (E), NJ (E) Carex limosa mud sedge Cyperaceae Graminoid CT (E), IN (E), NJ (E), OH (E), PA (T), RI (H) Carex livida livid sedge Cyperaceae Graminoid ME (SC), VT (T) Carex livida var. radicaulis livid sedge Cyperaceae Graminoid MA (E), NY (E) Carex longii Long's sedge Cyperaceae Graminoid OH (E) Carex louisianica sedge Cyperaceae Graminoid NJ (E), OH (E) Carex lucorum Blue Ridge sedge Cyperaceae Graminoid IL (E), OH (E) Carex lupuliformis false hop sedge Cyperaceae Graminoid CT (E), IN (R), MA (E), MI (T), NJ (E), NY (R), OH (T), WI (E) Carex lutea sulphur sedge Cyperaceae Graminoid Endangered NC (E) Carex macloviana thickhead sedge Cyperaceae Graminoid ME (PX) Carex macrochaeta longawn sedge Cyperaceae Graminoid WA (S) Carex magellanica ssp. irrigua boreal bog sedge Cyperaceae Graminoid WA (S) Carex paupercula CT (E), PA (R) Carex manhartii Manhart's sedge Cyperaceae Graminoid GA (T), TN (E) Carex meadii Mead's sedge Cyperaceae Graminoid NY (E), PA (E) Carex merritt-fernaldii Fernald's sedge Cyperaceae Graminoid NY (T), OH (E) Carex mesochorea midland sedge Cyperaceae Graminoid MA (E), NY (E), OH (T) Carex michauxiana Michaux's sedge Cyperaceae Graminoid MA (E), WI (T) Carex microdonta littletooth sedge Cyperaceae Graminoid FL (E) Carex misera wretched sedge Cyperaceae Graminoid GA (T), TN (T) Carex mitchelliana Mitchell's sedge Cyperaceae Graminoid NY (T), PA (E), RI (SC) Carex molesta troublesome sedge Cyperaceae Graminoid CT (SC), NY (T) Carex muehlenbergii Muhlenberg's sedge Cyperaceae Graminoid ME (T), VT (T) Carex muskingumensis Muskingum sedge Cyperaceae Graminoid TN (E, PX) Carex nigra smooth black sedge Cyperaceae Graminoid MI (E), NY (E) Carex nigromarginata black edge sedge Cyperaceae Graminoid CT (SC), IL (E), NY (E) Carex norvegica Norway sedge Cyperaceae Graminoid ME (E), WA (S) Carex norvegica ssp. inferalpina closedhead sedge Cyperaceae Graminoid MI (), WI () Carex media MI (T), WI (E) Carex novae-angliae New England sedge Cyperaceae Graminoid CT (SC), MI (T) Carex obtusata obtuse sedge Cyperaceae Graminoid WA (S) Carex oligocarpa richwoods sedge Cyperaceae Graminoid CT (E), MI (T), NJ (E), VT (E) Carex oligosperma fewseed sedge Cyperaceae Graminoid CT (SC), IL (E), MA (E), NC (E), OH (T), PA (T) Carex opaca Bicknell's sedge Cyperaceae Graminoid AR () Carex bicknellii var. opaca AR (E) Carex oronensis Orono sedge Cyperaceae Graminoid ME (T) Carex ouachitana Ouachita Mountain sedge Cyperaceae Graminoid TN (SC) Carex oxylepis sharpscale sedge Cyperaceae Graminoid IL (T) Carex oxylepis var. pubescens sharpscale sedge Cyperaceae Graminoid TN (SC) Carex pallescens pale sedge Cyperaceae Graminoid MN (E), OH (T), TN (SC) Carex pauciflora fewflower sedge Cyperaceae Graminoid CT (SC), MA (E), PA (E), WA (S) Carex peckii Peck's sedge Cyperaceae Graminoid NJ (E), OH (PRX) Carex pedunculata longstalk sedge Cyperaceae Graminoid IN (R), MD (E), RI (T) Carex pellita woolly sedge Cyperaceae Graminoid KY (), TN () Carex lanuginosa KY (E), TN (E, PX) Carex ×physocarpoides sedge Cyperaceae Graminoid Carex saxatilis var. major WA (S) Carex planispicata flat-spiked sedge Cyperaceae Graminoid NH () Carex amphibola var. rigida NH (T) Carex plantaginea plantainleaf sedge Cyperaceae Graminoid MN (E), NJ (E) Carex platyphylla broadleaf sedge Cyperaceae Graminoid MI (T) Carex pluriflora manyflower sedge Cyperaceae Graminoid WA (S) Carex polymorpha variable sedge Cyperaceae Graminoid CT (E), MA (E), MD (E, X), ME (E), NH (T), NJ (E), PA (T), RI (E), VA (E) Carex prairea prairie sedge Cyperaceae Graminoid CT (T), ME (T), PA (T) Carex prasina drooping sedge Cyperaceae Graminoid IL (T), WI (T) Carex praticola meadow sedge Cyperaceae Graminoid ME (PX) Carex projecta necklace sedge Cyperaceae Graminoid OH (T) Carex proposita Great Smoky Mountain sedge Cyperaceae Graminoid WA (S) Carex pseudocyperus cypress-like sedge Cyperaceae Graminoid CT (E), IN (E), NJ (E), OH (E), PA (E) Carex purpurifera purple sedge Cyperaceae Graminoid GA (T), OH (E) Carex rariflora looseflower alpine sedge Cyperaceae Graminoid ME (PX) Carex recta estuary sedge Cyperaceae Graminoid MA (E), ME (T) Carex reniformis kidneyshape sedge Cyperaceae Graminoid IL (E), KY (E), TN (SC) Carex retroflexa reflexed sedge Cyperaceae Graminoid NH (T), NY (E) Carex retrorsa knotsheath sedge Cyperaceae Graminoid IN (E), OH (E), PA (E) Carex richardsonii Richardson's sedge Cyperaceae Graminoid IN (E), OH (PRX), PA (E), VT (E) Carex roanensis Roan Mountain sedge Cyperaceae Graminoid KY (E), TN (E) Carex rossii Ross' sedge Cyperaceae Graminoid MI (T) Carex rostrata beaked sedge Cyperaceae Graminoid TN (T), WA (S) Carex ruthii Ruth's sedge Cyperaceae Graminoid TN (T) Carex sartwellii Sartwell's sedge Cyperaceae Graminoid NY (T), PA (X) Carex saxatilis rock sedge Cyperaceae Graminoid ME (E) Carex scabrata eastern rough sedge Cyperaceae Graminoid IN (E) Carex schweinitzii Schweinitz's sedge Cyperaceae Graminoid CT (E), MA (E), NC (E), NY (T), PA (E), RI (H), WI (E) Carex scirpoidea northern singlespike sedge Cyperaceae Graminoid ME (T), MI (T), NH (T), NY (E), WA (S) Carex seorsa weak stellate sedge Cyperaceae Graminoid IN (R), KY (SC), MI (T), NH (E), NY (T) Carex shortiana Short's sedge Cyperaceae Graminoid MD (E), NY (E) Carex siccata dryspike sedge Cyperaceae Graminoid ME (T), NJ (E), OH (E), VT (E) Carex aenea NC (E), PA (X) Carex foenea CT (SC), TN (T), VT (E), WA (S) Carex silicea beach sedge Cyperaceae Graminoid MD (E), ME (SC) Carex socialis low woodland sedge Cyperaceae Graminoid IN (R) Carex sparganioides bur-reed sedge Cyperaceae Graminoid ME (E), NH (E), RI (H) Carex specicola Navajo sedge Cyperaceae Graminoid Carex specuicola Threatened AZ (HS) Carex sprengelii Sprengel's sedge Cyperaceae Graminoid ME (SC), OH (T) Carex squarrosa squarrose sedge Cyperaceae Graminoid CT (SC) Carex ×stenolepis sedge Cyperaceae Graminoid ME (E) Carex sterilis dioecious sedge Cyperaceae Graminoid CT (SC), MA (T), ME (T), MN (T), PA (E), RI (H), TN (E, PX) Carex stipata var. maxima stalkgrain sedge Cyperaceae Graminoid KY (SC) Carex straminea eastern straw sedge Cyperaceae Graminoid IN (T), KY (T), MI (E), NY (E) Carex striata Walter's sedge Cyperaceae Graminoid MA (E) Carex striata var. brevis Walter's sedge Cyperaceae Graminoid RI (E) Carex striatula lined sedge Cyperaceae Graminoid IL (E), NY (E), OH (E) Carex styloflexa bent sedge Cyperaceae Graminoid NY (E), OH (PRX) Carex stylosa variegated sedge Cyperaceae Graminoid WA (S) Carex sychnocephala manyhead sedge Cyperaceae Graminoid NY (E), WA (S) Carex tenera quill sedge Cyperaceae Graminoid MD (E, X) Carex tenuiflora sparseflower sedge Cyperaceae Graminoid ME (SC), NY (E), OH (PRX), WA (S) Carex tetanica rigid sedge Cyperaceae Graminoid CT (SC), KY (E), MA (SC), MD (E, X), PA (T) Carex tincta tinged sedge Cyperaceae Graminoid NY (E) Carex tompkinsii Thompkins' sedge Cyperaceae Graminoid CA (R) Carex tonsa var. rugosperma parachute sedge Cyperaceae Graminoid KY () Carex rugosperma KY (T) Carex ×trichina sedge Cyperaceae Graminoid ME (PX) Carex trichocarpa hairyfruit sedge Cyperaceae Graminoid CT (SC), MA (T) Carex trisperma threeseeded sedge Cyperaceae Graminoid IL (E) Carex tuckermanii Tuckerman's sedge Cyperaceae Graminoid CT (SC), IL (E), MA (E), MD (E), NJ (E) Carex typhina cattail sedge Cyperaceae Graminoid CT (SC), MA (T), ME (PX), MI (T), NY (T), PA (E) Carex umbellata parasol sedge Cyperaceae Graminoid NH (E) Carex vaginata sheathed sedge Cyperaceae Graminoid ME (SC), NY (E), VT (E) Carex vallicola valley sedge Cyperaceae Graminoid WA (S) Carex venusta darkgreen sedge Cyperaceae Graminoid MD (T) Carex venusta var. minor darkgreen sedge Cyperaceae Graminoid NY (E) Carex vesicaria blister sedge Cyperaceae Graminoid MD (T) Carex vestita velvet sedge Cyperaceae Graminoid MD (E), ME (E), TN (E, PX) Carex viridula little green sedge Cyperaceae Graminoid CT (E), IL (T), PA (E) Carex wiegandii Wiegand's sedge Cyperaceae Graminoid MA (E), ME (SC), MI (T), NH (T), NY (E), PA (T) Carex willdenowii Willdenow's sedge Cyperaceae Graminoid CT (SC), IL (T), NY (T) Carex woodii pretty sedge Cyperaceae Graminoid CT (SC), IL (T) Carex xerantica whitescale sedge Cyperaceae Graminoid WA (S) Carnegiea gigantea Cactaceae Tree AZ () Carnegia gigantea AZ (HS, SR) Carpenteria californica tree anemone Hydrangeaceae Shrub CA (T) Carya aquatica water hickory Juglandaceae Tree KY (T) Carya cordiformis bitternut hickory Juglandaceae Tree ME (E) Carya laciniosa shellbark hickory Juglandaceae Tree MD (E), NY (T) Carya myristiciformis nutmeg hickory Juglandaceae Tree NC (T) Carya pallida sand hickory Juglandaceae Tree AR (T), IL (E), IN (T)

Carya texana black hickory Juglandaceae Tree IN (E) Cassiope lycopodioides clubmoss mountain heather Ericaceae Subshrub, Shrub WA (S) Castanea dentata American chestnut Fagaceae Tree KY (E), ME (SC), MI (E), TN (SC) Castanea pumila chinquapin Fagaceae Tree, Shrub KY (T), NJ (E) Castela emoryi crucifixion thorn Simaroubaceae Tree, Shrub AZ (SR) Castilleja affinis ssp. neglecta Tiburon Indian paintbrush Scrophulariaceae Subshrub, Endangered CA (T) Forb/herb Castilleja campestris ssp. succulenta succulent owl's- Scrophulariaceae Forb/herb Threatened CA (E) Castilleja coccinea scarlet Indian paintbrush Scrophulariaceae Forb/herb CT (E), KY (E), MD (E), ME (PX), NY (E), RI (H) Castilleja cryptantha obscure Indian paintbrush Scrophulariaceae Forb/herb WA (S) Castilleja grisea San Clemente Island Indian paintbrush Scrophulariaceae Subshrub, Endangered CA (E) Forb/herb Castilleja levisecta golden Indian paintbrush Scrophulariaceae Forb/herb Threatened OR (E), WA (E) Castilleja miniata ssp. miniata giant red Indian paintbrush Scrophulariaceae Forb/herb, CA () Subshrub Castilleja uliginosa CA (E) Castilleja pruinosa frosted Indian paintbrush Scrophulariaceae Subshrub, CA () Forb/herb Castilleja gleasoni CA (R) Castilleja salsuginosa Monte Neva Indian paintbrush Scrophulariaceae Forb/herb NV (FP) Castilleja septentrionalis Labrador Indian paintbrush Scrophulariaceae Forb/herb ME (SC), MI (T), MN (E), NH (T), VT (T) Castilleja sessiliflora downy paintedcup Scrophulariaceae Subshrub, IL (E) Forb/herb Castilleja sulphurea sulphur Indian paintbrush Scrophulariaceae Subshrub, AZ () Forb/herb Castilleja mogollonica AZ (SR) Catabrosa aquatica water whorlgrass Poaceae Graminoid WI (E) Catalpa speciosa northern catalpa Bignoniaceae Tree IN (R) Catesbaea parviflora smallflower lilythorn Rubiaceae Shrub FL (E) Catopsis berteroniana powdery strap airplant Bromeliaceae Forb/herb FL (E) Catopsis floribunda Florida strap airplant Bromeliaceae Forb/herb FL (E) Catopsis nutans FL (E) Caulophyllum giganteum giant blue cohosh Berberidaceae Forb/herb TN (T) Caulophyllum thalictroides blue cohosh Berberidaceae Forb/herb RI (T) Ceanothus americanus tea Rhamnaceae Subshrub, Shrub ME (T) Ceanothus hearstiorum Hearst Ranch buckbrush Rhamnaceae Subshrub, Shrub CA (R) Ceanothus herbaceus Jersey tea Rhamnaceae Shrub IL (E), IN (X), KY (T), NY (E), OH (E), VT (E) Ceanothus maritimus maritime ceanothus Rhamnaceae Shrub CA (R) Ceanothus masonii Mason's ceanothus Rhamnaceae Subshrub, Shrub CA (R) Ceanothus ophiochilus Vail Lake ceanothus Rhamnaceae Shrub Threatened CA (E) Ceanothus roderickii Pine Hill buckbrush Rhamnaceae Shrub Endangered CA (R) Ceanothus sanguineus redstem ceanothus Rhamnaceae Shrub MI (T) Celastrus scandens American bittersweet Celastraceae Vine NY (EV) Celosia nitida West Indian cock's comb Amaranthaceae Forb/herb, FL (E) Subshrub Celtis ehrenbergiana spiny hackberry Ulmaceae Shrub, Tree FL () Celtis pallida FL (E) Celtis iguanaea iguana hackberry Ulmaceae Tree, Shrub, Vine FL (E) Celtis occidentalis common hackberry Ulmaceae Tree, Shrub NH (T) Cenchrus longispinus mat sandbur Poaceae Graminoid ME (T), NH (T) Cenchrus tribuloides sanddune sandbur Poaceae Graminoid NY (T) Centaurium muehlenbergii Muhlenberg's centaury Gentianaceae Forb/herb WA (PX) Centaurium namatophilum springloving centaury Gentianaceae Forb/herb Threatened NV (FP) Centaurium namophilum Threatened NV (FP) Centella erecta erect centella Apiaceae Forb/herb MD (E) Centrosema arenicola pineland butterfly Fabaceae Vine, Forb/herb FL (E) Centrosema virginianum spurred butterfly pea Fabaceae Vine, Forb/herb NJ (E) Cerastium arvense ssp. velutinum var. velutinum field chickweed Caryophyllaceae Forb/herb TN () Cerastium velutinum TN (E) Cerastium arvense ssp. velutinum var. villosum field chickweed Caryophyllaceae Forb/herb PA () Cerastium arvense var. villosissimum PA (E) Cerastium nutans nodding chickweed Caryophyllaceae Forb/herb MA (E) Ceratiola ericoides sand heath Empetraceae Subshrub, Shrub, GA (T) Forb/herb Ceratophyllum echinatum spineless hornwort Ceratophyllaceae Forb/herb MD (E), ME (SC), NJ (E), NY (T), TN (SC) Cercis canadensis eastern redbud Fabaceae Tree, Shrub CT (SC), NJ (E) Cercis canadensis var. texensis Texas redbud Fabaceae Tree, Shrub AZ () Cercis occidentalis AZ (SR) Cercocarpus traskiae Catalina Island mountain mahogany Rosaceae Tree, Shrub Endangered CA (E) Chaenactis thompsonii Thompson's pincushion Asteraceae Forb/herb WA (S) Chaerophyllum procumbens spreading chervil Apiaceae Forb/herb NY (E) Chaerophyllum procumbens var. shortii Short's spreading chervil Apiaceae Forb/herb IN (E) Chamaecrista fasciculata var. macrosperma partridge pea Fabaceae Forb/herb MD (E) Chamaecrista lineata var. keyensis narrowpod sensitive pea Fabaceae Subshrub, FL () Forb/herb Cassia keyensis FL (E) Chamaecrista nictitans ssp. nictitans var. nictitans sensitive partridge pea Fabaceae Subshrub, NH () Forb/herb Cassia nictitans NH (E) Chamaecyparis thyoides Atlantic white cedar Cupressaceae Tree GA (R), ME (SC), NY (R), PA (X) Chamaedaphne calyculata leatherleaf Ericaceae Shrub IL (T), MD (T) Chamaelirium luteum fairywand Liliaceae Forb/herb CT (E), IN (E), MA (E), NY (T) Chamaerhodos erecta ssp. nuttallii Nuttall's little Rosaceae Forb/herb MI () Chamaerhodos nuttallii var. keweenawensis MI (E) Chamaesyce cumulicola coastal dune sandmat Euphorbiaceae Forb/herb FL (E) Chamaesyce deltoidea wedge sandmat Euphorbiaceae Subshrub, FL (E) Forb/herb Chamaesyce garberi Garber's sandmat Euphorbiaceae Subshrub, Threatened FL (E) Forb/herb Chamaesyce pergamena sandmat Euphorbiaceae Forb/herb FL (T) Chamaesyce polygonifolia seaside sandmat Euphorbiaceae Forb/herb IL (E), PA (T) Chamaesyce porteriana Porter's sandmat Euphorbiaceae Subshrub, FL (E) Forb/herb Chamaesyce serpens matted sandmat Euphorbiaceae Forb/herb IN (), OH () Euphorbia serpens IN (X), OH (E) Chamerion angustifolium ssp. angustifolium fireweed Onagraceae Forb/herb IN (), OH (), TN () Epilobium angustifolium IN (E), OH (E), TN (SC) Chaptalia albicans white sunbonnets Asteraceae Forb/herb FL (T) Chasmanthium latifolium Indian woodoats Poaceae Graminoid MI (T) Chasmanthium laxum slender woodoats Poaceae Graminoid NY (E), PA (E) Cheilanthes alabamensis Alabama lipfern Pteridaceae Forb/herb KY (E) Cheilanthes feei slender lipfern Pteridaceae Forb/herb KY (E), WA (S) Cheilanthes lanosa hairy lipfern Pteridaceae Forb/herb CT (E), IN (R), MN (E), NY (E) Cheilanthes microphylla southern lipfern Pteridaceae Forb/herb FL (E) Cheiroglossa palmata hand fern Ophioglossaceae Forb/herb FL () Ophioglossum palmatum FL (E) Chelone glabra white turtlehead Scrophulariaceae Forb/herb NY (EV) Chelone obliqua red turtlehead Scrophulariaceae Forb/herb MD (T), MI (E) Chelone obliqua var. obliqua red turtlehead Scrophulariaceae Forb/herb KY (E) Chelone obliqua var. speciosa red turtlehead Scrophulariaceae Forb/herb AR (E), KY (SC) Chenopodium album var. missouriense lambsquarters Chenopodiaceae Forb/herb NY (E) Chenopodium berlandieri pitseed goosefoot Chenopodiaceae Forb/herb ME (SC) Chenopodium berlandieri var. boscianum pitseed goosefoot Chenopodiaceae Forb/herb NH () Chenopodium boscianum NH (E) Chenopodium berlandieri var. macrocalycium pitseed goosefoot Chenopodiaceae Forb/herb NY (E) Chenopodium capitatum blite goosefoot Chenopodiaceae Forb/herb OH (PRX) Chenopodium foggii Fogg's goosefoot Chenopodiaceae Forb/herb MA (E), PA (E) Chenopodium leptophyllum narrowleaf goosefoot Chenopodiaceae Forb/herb OH (PRX), RI (SC) Chenopodium rubrum red goosefoot Chenopodiaceae Forb/herb ME (T), NH (T), NJ (E), NY (T) Chenopodium simplex mapleleaf goosefoot Chenopodiaceae Forb/herb MD () Chenopodium gigantospermum MD (E) Chenopodium standleyanum Standley's goosefoot Chenopodiaceae Forb/herb MD (E)

Chilopsis linearis ssp. arcuata desert willow Bignoniaceae Tree, Shrub AZ () Chilopsis linearis var. arcuata AZ (SA) Chilopsis linearis ssp. linearis desert willow Bignoniaceae Tree, Shrub AZ () Chilopsis linearis var. glutinosa AZ (SA) Chimaphila maculata striped prince's pine Pyrolaceae Subshrub IL (E), ME (E), NY (EV) Chimaphila umbellata pipsissewa Pyrolaceae Subshrub IA (T), IL (E), NY (EV), OH (T) Chimaphila umbellata ssp. cisatlantica pipsissewa Pyrolaceae Subshrub IN (T) Chionanthus pygmaeus pygmy fringetree Oleaceae Subshrub, Shrub Endangered FL (E) Chionanthus virginicus white fringetree Oleaceae Tree, Shrub OH (T) Chlorogalum purpureum var. reductum Camatta Canyon amole Liliaceae Forb/herb CA (R) Chorizanthe howellii Mendocino spineflower Polygonaceae Forb/herb Endangered CA (T) Chorizanthe orcuttiana San Diego spineflower Polygonaceae Forb/herb Endangered CA (E) Chorizanthe valida Sonoma spineflower Polygonaceae Forb/herb Endangered CA (E) Chromolaena frustrata Cape Sable thoroughwort Asteraceae Forb/herb, FL () Subshrub Eupatorium frustratum FL (E) virginianum green and gold Asteraceae Forb/herb KY (E), OH (T), PA (E), TN (T) Chrysolepis chrysophylla giant chinquapin Fagaceae Tree, Shrub WA (S) Chrysoma pauciflosculosa woody goldenrod Asteraceae Subshrub, Shrub NC (E) Chrysophyllum oliviforme satinleaf Sapotaceae Tree, Shrub FL (T) Chrysopsis floridana Florida goldenaster Asteraceae Forb/herb Endangered FL (E) Chrysopsis godfreyi Godfrey's goldenaster Asteraceae Forb/herb FL (E) Chrysopsis gossypina ssp. cruiseana cottony goldenaster Asteraceae Forb/herb FL () Chrysopsis cruiseana FL (E) Chrysopsis mariana goldenaster Asteraceae Forb/herb PA (E), RI (T) Chrysosplenium alternifolium var. sibiricum Iowa golden saxifrage Saxifragaceae Forb/herb IA (), MN () Chrysosplenium iowense IA (T), MN (E) Chrysosplenium americanum American golden saxifrage Saxifragaceae Forb/herb IN (T), KY (E) Chrysosplenium tetrandrum northern golden saxifrage Saxifragaceae Forb/herb WA (S) Cicuta bulbifera bulblet-bearing water hemlock Apiaceae Forb/herb MD (E), WA (S) Cienfuegosia yucatanensis Yucatan flymallow Malvaceae Subshrub, FL (E) Forb/herb Cinna latifolia drooping woodreed Poaceae Graminoid MD (T), NJ (E), OH (E) Circaea alpina small enchanter's nightshade Onagraceae Forb/herb IL (E), IN (X), KY (SC), RI (SC) Cirsium carolinianum soft thistle Asteraceae Forb/herb IN (R), OH (T) Cirsium ciliolatum Ashland thistle Asteraceae Forb/herb CA (E) Cirsium fontinale var. fontinale fountain thistle Asteraceae Forb/herb Endangered CA (E) Cirsium fontinale var. obispoense Chorro Creek Bog thistle Asteraceae Forb/herb Endangered CA (E) Cirsium hillii Hill's thistle Asteraceae Forb/herb IL (T), IN (E), WI (T) Cirsium horridulum yellow thistle Asteraceae Forb/herb CT (E), NH (E), PA (E), RI (T) Cirsium loncholepis la graciosa thistle Asteraceae Forb/herb Endangered CA (T) Cirsium muticum swamp thistle Asteraceae Forb/herb AR (T) Cirsium parryi Parry's thistle Asteraceae Forb/herb AZ (SR) Cirsium pitcheri sand dune thistle Asteraceae Forb/herb Threatened IL (T), IN (T), MI (T), WI (T) Cirsium rhothophilum surf thistle Asteraceae Forb/herb CA (T) Cirsium vinaceum Sacramento Mountain thistle Asteraceae Forb/herb Threatened NM (E) Cirsium virginense virgin thistle Asteraceae Forb/herb AZ (SR) Cirsium virginianum Virginia thistle Asteraceae Forb/herb NJ (E) Cissampelos pareira velvetleaf Menispermaceae Shrub, Vine FL (E) Cistanthe rosea rosy pussypaws Portulacaceae Forb/herb WA () Calyptridium roseum WA (S) Cladium mariscoides smooth sawgrass Cyperaceae Graminoid PA (E) Cladrastis kentukea yellowwood Fabaceae Tree IL (), IN () Cladrastis lutea IL (E), IN (T) Clarkia franciscana Presidio clarkia Onagraceae Forb/herb Endangered CA (E) Clarkia imbricata Vine Hill clarkia Onagraceae Forb/herb Endangered CA (E) Clarkia lingulata Merced clarkia Onagraceae Forb/herb CA (E) Clarkia speciosa ssp. immaculata Pismo clarki Onagraceae Forb/herb Endangered CA (R) Clarkia springvillensis Springville clarkia Onagraceae Forb/herb Threatened CA (E) Claytonia lanceolata var. pacifica Pacific springbeauty Portulacaceae Forb/herb WA (S) Claytonia virginica Virginia springbeauty Portulacaceae Forb/herb MA (E), RI (H) Claytonia virginica var. hammondiae Hammond's claytonia Portulacaceae Forb/herb NJ (E) Cleistes divaricata rosebud orchid Orchidaceae Forb/herb FL (T), MD (E), NJ (E) Clematis crispa swamp leather flower Ranunculaceae Vine IL (E), KY (T) Clematis glaucophylla whiteleaf leather flower Ranunculaceae Vine TN (E) Clematis hirsutissima var. arizonica Arizona clematis Ranunculaceae Subshrub, AZ (HS) Forb/herb Clematis occidentalis western blue virginsbower Ranunculaceae Vine IL (E), MA (SC), MD (E), ME (SC), OH (PRX), RI (E) Clematis ochroleuca curlyheads Ranunculaceae Subshrub, MD (E, X) Forb/herb Clematis pitcheri bluebill Ranunculaceae Vine IN (R) Clematis socialis Alabama leather flower Ranunculaceae Vine Endangered GA (E) Clematis viorna vasevine Ranunculaceae Vine IL (E), PA (E) Cleome multicaulis slender spiderflower Capparaceae Forb/herb AZ (SR), NM (E) Clethra acuminata mountain sweetpepperbush Clethraceae Tree, Shrub PA (E) Clethra alnifolia coastal sweetpepperbush Clethraceae Shrub ME (SC), TN (T) Clinopodium arkansanum limestone calamint Lamiaceae Forb/herb IN (), OH () Calamintha arkansana OH (T) Satureja glabella var. angustifolia IN (E) Clinopodium ashei Ashe's calamint Lamiaceae Forb/herb, FL (), GA () Subshrub Calamintha ashei FL (T), GA (T) Clinopodium dentatum Florida calamint Lamiaceae Subshrub FL () Calamintha dentata FL (T) Clinopodium georgianum Georgia calamint Lamiaceae Shrub FL () Calamintha georgiana FL (E) Clinopodium vulgare wild basil Lamiaceae Forb/herb IN () Satureja vulgaris var. neogaea IN (E) Clintonia borealis bluebead Liliaceae Forb/herb IN (E), MD (T), OH (E), TN (SC) Clintonia umbellulata white clintonia Liliaceae Forb/herb NY (EV), OH (T) Clitoria fragrans sweetscented pigeonwings Fabaceae Forb/herb Threatened FL (E) Clitoria mariana Atlantic pigeonwings Fabaceae Vine, Forb/herb NJ (E), PA (E) Coccothrinax argentata Florida silver palm Arecaceae Tree, Shrub FL (T) Cochlearia groenlandica Danish scurvygrass Brassicaceae Forb/herb WA () Cochlearia officinalis ssp. arctica WA (S) Coelorachis rugosa wrinkled jointtail grass Poaceae Graminoid MD (E), NJ (E) Coelorachis tuberculosa bumpy jointtail grass Poaceae Graminoid FL (T) Collinsia parviflora maiden blue eyed Mary Scrophulariaceae Forb/herb MI (T) Collinsia sparsiflora var. bruceae spinster's blue eyed Mary Scrophulariaceae Forb/herb WA (S) Collinsia verna spring blue eyed Mary Scrophulariaceae Forb/herb NY (E), TN (E) Collinsia violacea violet blue eyed Mary Scrophulariaceae Forb/herb IL (E) Collinsonia canadensis richweed Lamiaceae Forb/herb WI (E) Collinsonia verticillata stoneroot Lamiaceae Forb/herb KY (E), OH (E) Collomia macrocalyx bristleflower collomia Polemoniaceae Forb/herb WA (S) Colubrina arborescens greenheart Rhamnaceae Tree, Shrub FL (E) Colubrina cubensis Cuban nakedwood Rhamnaceae Tree, Shrub FL (E) Colubrina elliptica soldierwood Rhamnaceae Tree, Shrub FL (E) Comarum palustre purple marshlocks Rosaceae Forb/herb NJ () Potentilla palustris NJ (E) Commelina erecta whitemouth dayflower Commelinaceae Forb/herb IA (T), MI (PREX), NJ (E), PA (X) Commelina virginica Virginia dayflower Commelinaceae Forb/herb PA (X) Comptonia peregrina sweet fern Myricaceae Subshrub, Shrub IL (E), KY (E), OH (T), TN (E) Conioselinum chinense eastern hemlockparsley Apiaceae Forb/herb IL (E), IN (E), MA (SC), NC (E), NJ (E), PA (E), WI (E) Conopholis americana American cancer- Forb/herb NH (T), NY (EV), RI (SC) Conradina canescens false rosemary Lamiaceae Shrub FL () Conradina brevifolia Endangered FL (E) Conradina etonia Etoniah rosemary Lamiaceae Shrub Endangered FL (E) Conradina glabra Apalachicola false rosemary Lamiaceae Shrub Endangered FL (E) Conradina grandiflora largeflower false rosemary Lamiaceae Shrub FL (T) Conradina verticillata Cumberland false rosemary Lamiaceae Shrub Threatened KY (E), TN (T) corallicola semaphore pricklypear Cactaceae Shrub FL () Opuntia corallicola FL (E) Convallaria majuscula American lily-of-the-valley Liliaceae Forb/herb KY () Convallaria montana KY (E) Conyza canadensis var. pusilla Canadian horseweed Asteraceae Forb/herb IN (X) Conyza ramosissima dwarf horseweed Asteraceae Forb/herb OH (T) Coptis aspleniifolia fernleaf goldthread Ranunculaceae Forb/herb WA (S) Coptis trifolia threeleaf goldthread Ranunculaceae Forb/herb MD (E), WA (S) Corallorhiza maculata summer coralroot Orchidaceae Forb/herb RI (SC) Corallorrhiza maculata AZ (SR), IA (T), IL (T), KY (E), NY (EV), TN (T) Corallorhiza odontorhiza autumn coralroot Orchidaceae Forb/herb FL (E) Corallorrhiza odontorhiza MA (SC), ME (E), NH (E), NY (EV), RI (E), VT (T) Corallorhiza striata hooded coralroot Orchidaceae Forb/herb AZ (), NY () Corallorrhiza striata AZ (SR), NY (E) Corallorhiza trifida yellow coralroot Orchidaceae Forb/herb RI (SC) Corallorrhiza trifida CT (T), MD (E), OH (E) Corallorrhiza trifida var. verna IN (X) Corallorhiza wisteriana spring coralroot Orchidaceae Forb/herb AZ (), MD (), PA () Corallorrhiza wisteriana AZ (SR), MD (E), PA (E) Cordia globosa curaciao bush Boraginaceae Shrub FL (E) Cordylanthus maritimus ssp. maritimus saltmarsh bird's-beak Scrophulariaceae Forb/herb Endangered CA (E) Cordylanthus maritimus ssp. palustris Pt. Reyes bird's-beak Scrophulariaceae Forb/herb OR (E) Cordylanthus mollis ssp. mollis soft bird's-beak Scrophulariaceae Forb/herb Endangered CA (R) Cordylanthus nidularius Mt. Diablo bird's-beak Scrophulariaceae Forb/herb CA (R) Cordylanthus palmatus palmbract bird's-beak Scrophulariaceae Forb/herb Endangered CA (E) Cordylanthus rigidus ssp. littoralis seaside bird's beak Scrophulariaceae Forb/herb CA (E) Cordylanthus tenuis ssp. capillaris Pennell's bird's beak Scrophulariaceae Forb/herb Endangered CA (R) Corema conradii broom crowberry Empetraceae Subshrub, Shrub MA (SC), NJ (E), NY (E) delphiniifolia larkspurleaf tickseed Asteraceae Forb/herb TN (E) Coreopsis integrifolia fringeleaf tickseed Asteraceae Forb/herb FL (E) Coreopsis latifolia broadleaf tickseed Asteraceae Forb/herb TN (E) Coreopsis palmata stiff tickseed Asteraceae Forb/herb MI (T) Coreopsis pubescens star tickseed Asteraceae Forb/herb KY (SC) Coreopsis rosea pink tickseed Asteraceae Forb/herb MD (E), NY (R), PA (X), RI (SC) Coreopsis tripteris tall tickseed Asteraceae Forb/herb MD (E) Cornus alternifolia alternateleaf dogwood Cornaceae Tree, Shrub FL (E) Cornus amomum silky dogwood Cornaceae Shrub IN (E) Cornus canadensis bunchberry dogwood Cornaceae Subshrub, Shrub, IA (T), IL (E), Forb/herb IN (E), MD (E), OH (T) Cornus drummondii roughleaf dogwood Cornaceae Tree, Shrub NY (E) flowering dogwood Cornaceae Tree, Shrub ME (E), NY (EV), VT (T) Cornus obliqua silky dogwood Cornaceae Shrub NJ () Cornus amomum var. schuetzeana NJ (E) Cornus rugosa roundleaf dogwood Cornaceae Tree, Shrub IN (R), MD (E), RI (SC) Corydalis aurea scrambled eggs Fumariaceae Forb/herb IA (T), IL (E), NY (T), PA (E), VT (T) Corydalis caseana ssp. aquae-gelidae coldwater fumewort Fumariaceae Forb/herb WA () Corydalis aquae-gelidae WA (T) Corydalis curvisiliqua curvepod fumewort Fumariaceae Forb/herb IA (E) Corydalis flavula yellow fumewort Fumariaceae Forb/herb CT (T), MI (T)

Corydalis micrantha ssp. australis smallflower fumewort Fumariaceae Forb/herb IL () Corydalis halei IL (E) Corydalis sempervirens rock harlequin Fumariaceae Forb/herb IA (T), IL (E), IN (E), KY (SC), RI (SC), TN (E) Corylus cornuta beaked hazelnut Betulaceae Tree, Shrub OH (PRX) Corylus cornuta var. cornuta beaked hazelnut Betulaceae Tree, Shrub IL () Corylus rostrata IL (E) Coryphantha ramillosa whiskerbush Cactaceae Shrub Threatened TX (T) Coryphantha recurvata Santa Cruz beehive cactus Cactaceae Shrub AZ (HS, SR) Coryphantha robustispina ssp. robustispina long-tubercle beehive cactus Cactaceae Shrub AZ () Coryphantha scheeri var. robustispina Endangered AZ (HS) Coryphantha robustispina ssp. scheeri Scheer's beehive cactus Cactaceae Shrub NM () Coryphantha scheeri var. scheeri NM (E) Coryphantha robustispina ssp. uncinata Scheer's beehive cactus Cactaceae Shrub AZ (), NM () Coryphantha scheeri var. uncinata NM (E) Coryphantha scheeri var. valida AZ (SR) Cotinus obovatus American smoketree Tree, Shrub TN (SC) Cranichis muscosa cypress-knee helmet orchid Orchidaceae Forb/herb FL (E) Crassula aquatica water pygmyweed Crassulaceae Forb/herb CT (E), MA (T), MD (E, X), ME (SC), MN (T), NY (E), PA (X) Tillaea aquatica NH (E) Crassula connata sand pygmyweed Crassulaceae Forb/herb WA (S) arborea Montgomery hawthorn Rosaceae Tree, Shrub IN (E) Crataegus berberifolia barberry hawthorn Rosaceae Tree, Shrub NY (E) Crataegus brainerdii Brainerd's hawthorn Rosaceae Tree, Shrub OH (PRX) Crataegus calpodendron pear hawthorn Rosaceae Tree, Shrub NJ (E) Crataegus chrysocarpa fireberry hawthorn Rosaceae Tree, Shrub IN (E) Crataegus compacta clustered hawthorn Rosaceae Tree, Shrub NY (E) Crataegus douglasii black hawthorn Rosaceae Tree, Shrub MN (T) Crataegus grandis grand hawthorn Rosaceae Tree, Shrub IN (E) Crataegus harbisonii Harbison's hawthorn Rosaceae Tree, Shrub TN (E) Crataegus intricata Copenhagen hawthorn Rosaceae Tree, Shrub IN (R) Crataegus biltmoreana IN (E) Crataegus kelloggii Kellogg's hawthorn Rosaceae Tree, Shrub IN (E) Crataegus mollis downy hawthorn Rosaceae Tree, Shrub NY (E) Crataegus pedicellata scarlet hawthorn Rosaceae Tree, Shrub IN (T) Crataegus phaenopyrum hawthorn Rosaceae Tree, Shrub FL (E) Crataegus prona hawthorn Rosaceae Tree, Shrub IN (E) Crataegus succulenta fleshy hawthorn Rosaceae Tree, Shrub IN (R), NJ (E) Crataegus bicknellii MA (E) Crataegus uniflora dwarf hawthorn Rosaceae Tree, Shrub NY (E), OH (E) Crataegus viridis green hawthorn Rosaceae Tree, Shrub IN (T) Croomia pauciflora croomia Stemonaceae Forb/herb FL (E), GA (T) Crossopetalum ilicifolium Christmasberry Celastraceae Shrub FL (T) Crossopetalum rhacoma maidenberry Celastraceae Tree, Shrub FL (T) Crotalaria avonensis Avon Park rattlebox Fabaceae Forb/herb Endangered FL (E) Crotalaria purshii Pursh's rattlebox Fabaceae Forb/herb TN (E, PX) Crotalaria rotundifolia rabbitbells Fabaceae Forb/herb MD (E) Crotalaria sagittalis arrowhead rattlebox Fabaceae Subshrub, NH (E), NY (E), Forb/herb RI (T), VT (T) Croton alabamensis Alabama croton Euphorbiaceae Subshrub, Shrub TN (E, PX) Croton glandulosus vente conmigo Euphorbiaceae Subshrub, OH (T) Forb/herb Croton humilis pepperbush Euphorbiaceae Shrub FL (E) Croton michauxii var. ellipticus Michaux's croton Euphorbiaceae Forb/herb Crotonopsis elliptica CT (SC), IN (E), PA (X) Croton wigginsii Wiggins' croton Euphorbiaceae Shrub, Subshrub CA (R) Cryptantha crassipes Terlingua Creek cryptantha Boraginaceae Subshrub, Endangered TX (E) Forb/herb Cryptantha flaccida weakstem cryptantha Boraginaceae Forb/herb WA () Cryptantha rostellata WA (S)

Cryptantha insolita Las Vegas cryptantha Boraginaceae Forb/herb NV (FP) Cryptantha leucophaea gray cryptantha Boraginaceae Forb/herb WA (S) Cryptantha roosiorum bristlecone cryptantha Boraginaceae Subshrub, CA (R) Forb/herb Cryptantha scoparia Pinyon Desert cryptantha Boraginaceae Forb/herb WA (S) Cryptantha spiculifera Snake River cryptantha Boraginaceae Subshrub, WA (S) Forb/herb Cryptogramma acrostichoides American rockbrake Pteridaceae Forb/herb MI (E) Cryptogramma stelleri fragile rockbrake Pteridaceae Forb/herb CT (E), MA (E), ME (T), NH (T), NJ (E), NY (EV), PA (E), WA (S) Cryptotaenia canadensis Canadian honewort Apiaceae Forb/herb FL (E), ME (PX), RI (SC) Ctenitis sloanei Florida lacefern Dryopteridaceae Forb/herb FL (E) Ctenitis submarginalis brownhair lacefern Dryopteridaceae Forb/herb FL (E) Ctenium floridanum Florida orangegrass Poaceae Graminoid FL (E) Cucurbita okeechobeensis Okeechobee gourd Cucurbitaceae Vine, Forb/herb Endangered FL (E) Cupania glabra Florida toadwood Sapindaceae Tree FL (E) Cuphea aspera tropical waxweed Lythraceae Forb/herb FL (E) Cuphea viscosissima blue waxweed Lythraceae Forb/herb CT (SC) Cuscuta cephalanthi buttonbush dodder Cuscutaceae Vine, Forb/herb NJ (E), NY (E) Cuscuta compacta compact dodder Cuscutaceae Vine, Forb/herb OH (PRX) Cuscuta coryli hazel dodder Cuscutaceae Vine, Forb/herb CT (SC), MD (E, X), OH (E), RI (H) Cuscuta cuspidata cusp dodder Cuscutaceae Vine, Forb/herb IN (X) Cuscuta denticulata desert dodder Cuscutaceae Vine, Forb/herb WA (S) Cuscuta glomerata rope dodder Cuscutaceae Vine, Forb/herb OH (T) Cuscuta harperi Harper's dodder Cuscutaceae Vine, Forb/herb GA (T) Cuscuta indecora bigseed alfalfa dodder Cuscutaceae Vine, Forb/herb NJ (E) Cuscuta obtusiflora var. glandulosa Peruvian dodder Cuscutaceae Vine, Forb/herb NY (E) Cuscuta pentagona fiveangled dodder Cuscutaceae Vine, Forb/herb NH (E), OH (E) Cuscuta polygonorum smartweed dodder Cuscutaceae Vine, Forb/herb MD (E), NY (E) Cuscuta rostrata beaked dodder Cuscutaceae Vine, Forb/herb MD (E) Cusickiella douglasii alkali cusickiella Brassicaceae Forb/herb WA (T) Cyclopogon elatus tall ladies'-tresses Orchidaceae Forb/herb FL () Spiranthes elata FL (E) Cylindropuntia acanthocarpa var. acanthocarpa buckhorn cholla Cactaceae Shrub AZ () Opuntia acanthocarpa var. acanthocarpa AZ (SR) Cylindropuntia acanthocarpa var. coloradensis Colorado buckhorn cholla Cactaceae Shrub AZ (), NV () Opuntia acanthocarpa var. coloradensis AZ (SR), NV (CY) Cylindropuntia acanthocarpa var. major buckhorn cholla Cactaceae Shrub AZ () Opuntia acanthocarpa var. major AZ (SR) Cylindropuntia acanthocarpa var. thornberi Thornber's buckhorn cholla Cactaceae Shrub AZ () Opuntia acanthocarpa var. thornberi AZ (SR) Cylindropuntia arbuscula Arizona pencil cholla Cactaceae Shrub AZ () Opuntia arbuscula AZ (SR) Cylindropuntia bigelovii teddybear cholla Cactaceae Shrub, Subshrub AZ (), NV () Opuntia bigelovii AZ (SR), NV (CY) Cylindropuntia echinocarpa Wiggins' cholla Cactaceae Shrub AZ (), NV () Opuntia echinocarpa AZ (SR), NV (CY) Opuntia wigginsii AZ (SR) Cylindropuntia fulgida var. fulgida jumping cholla Cactaceae Shrub, Tree AZ () Opuntia fulgida var. fulgida AZ (SR) Cylindropuntia fulgida var. mamillata jumping cholla Cactaceae Shrub, Tree AZ () Opuntia fulgida var. mamillata AZ (SR) Cylindropuntia imbricata var. imbricata tree cholla Cactaceae Shrub, Tree AZ () Opuntia imbricata AZ (SR) Cylindropuntia ×kelvinensis Kelvin pricklypear Cactaceae Shrub Opuntia ×kelvinensis AZ (SR) Cylindropuntia leptocaulis Christmas cactus Cactaceae Shrub AZ () Opuntia leptocaulis AZ (SR) Cylindropuntia ×multigeniculata Blue Diamond cholla Cactaceae Shrub AZ (), NV () Opuntia whipplei var. multigeniculata AZ (SR), NV (CY, FP) Cylindropuntia ramosissima branched pencil cholla Cactaceae Shrub AZ (), NV () Opuntia ramosissima AZ (SR), NV (CY) Cylindropuntia spinosior walkingstick cactus Cactaceae Shrub AZ () Opuntia spinosior AZ (SR) Cylindropuntia ×tetracantha Tucson pricklypear Cactaceae Shrub AZ () Opuntia kleiniae var. tetracantha AZ (SR) Cylindropuntia versicolor staghorn cholla Cactaceae Shrub AZ () Opuntia versicolor AZ (SR) Cylindropuntia ×vivipara cholla Cactaceae Shrub Opuntia ×vivipara AZ (SR) Cylindropuntia whipplei Whipple cholla Cactaceae Shrub AZ (), NV () Opuntia whipplei AZ (SR), NV (CY) Cymophyllus fraserianus Fraser's cymophyllus Cyperaceae Graminoid GA (T), KY (E), MD (E), TN (SC) Cymophyllus fraseri PA (E) Cynanchum blodgettii Blodgett's swallow-wort Asclepiadaceae Vine, Forb/herb FL (T) Cynanchum laeve honeyvine Asclepiadaceae Vine, Forb/herb PA (E) Cynoglossum virginianum wild comfrey Boraginaceae Forb/herb CT (SC), FL (E), ME (E) Cynoglossum virginianum var. boreale wild comfrey Boraginaceae Forb/herb NJ (E), NY (E), OH (PRX), VT (T) Cynoglossum boreale NH (E), PA (X) Cynoglossum virginianum var. virginianum wild comfrey Boraginaceae Forb/herb NY (E) Cynosciadium digitatum finger dogshade Apiaceae Forb/herb IL (E) Cyperus acuminatus tapertip flatsedge Cyperaceae Graminoid IN (E), MI (PREX), MN (T), OH (E) Cyperus bipartitus slender flatsedge Cyperaceae Graminoid WA (S) Cyperus dentatus toothed flatsedge Cyperaceae Graminoid IN (E), MD (E, X), TN (SC) Cyperus diandrus umbrella flatsedge Cyperaceae Graminoid PA (E), VT (E) Cyperus echinatus globe flatsedge Cyperaceae Graminoid NY (E) Cyperus erythrorhizos redroot flatsedge Cyperaceae Graminoid ME (T) Cyperus flavescens yellow flatsedge Cyperaceae Graminoid NY (E) Cyperus floridanus Florida flatsedge Cyperaceae Graminoid FL (E) Cyperus fuligineus limestone flatsedge Cyperaceae Graminoid FL (E) Cyperus grayi Gray's flatsedge Cyperaceae Graminoid NH (E) Cyperus grayoides Illinois flatsedge Cyperaceae Graminoid IL (T) Cyperus houghtonii Houghton's flatsedge Cyperaceae Graminoid IN (R), MA (E), ME (PX), NH (T), OH (PRX), PA (E), VT (T) Cyperus hystricinus bristly flatsedge Cyperaceae Graminoid NJ (E) Cyperus lancastriensis manyflower flatsedge Cyperaceae Graminoid IL (E), NJ (E), OH (E) Cyperus lupulinus ssp. lupulinus Great Plains flatsedge Cyperaceae Graminoid NY (T) Cyperus odoratus fragrant flatsedge Cyperaceae Graminoid RI (SC) Cyperus engelmannii MA (T), PA (R), TN (SC) Cyperus plukenetii Plukenet's flatsedge Cyperaceae Graminoid KY (H), MD (E, X), NJ (E), TN (SC) Cyperus polystachyos manyspike flatsedge Cyperaceae Graminoid NJ (E), PA (X) Cyperus polystachyos var. texensis Texan flatsedge Cyperaceae Graminoid NY (E) Cyperus pseudovegetus marsh flatsedge Cyperaceae Graminoid IN (R), NJ (E) Cyperus refractus reflexed flatsedge Cyperaceae Graminoid NJ (E), OH (E), PA (E) Cyperus retrofractus rough flatsedge Cyperaceae Graminoid NJ (E) Cyperus dipsaciformis OH (E) Cyperus retrorsus pine barren flatsedge Cyperaceae Graminoid NY (E), PA (X) Cyperus schweinitzii Schweinitz's flatsedge Cyperaceae Graminoid NY (R), PA (R) Cyperus squarrosus bearded flatsedge Cyperaceae Graminoid RI (E) Cyperus aristatus ME (PX), NH (T) moccasin flower Orchidaceae Forb/herb GA (U), IL (E), NY (EV), TN (CE, E) Cypripedium arietinum ram's head lady's slipper Orchidaceae Forb/herb CT (SC), MA (E), ME (E), MN (T), NH (E), NY (T), VT (T), WI (T) Cypripedium candidum white lady's slipper Orchidaceae Forb/herb IL (T), IN (R), KY (E), MD (E), MI (T), NJ (E), NY (E), OH (E), PA (X), WI (T)

Cypripedium fasciculatum clustered lady's slipper Orchidaceae Forb/herb WA (S) Cypripedium kentuckiense Kentucky lady's slipper Orchidaceae Forb/herb KY (SC), TN (E) Cypripedium parviflorum lesser yellow lady's slipper Orchidaceae Forb/herb CT (SC), IL (E), KY (T), NH (E), NY (E), PA (E), WA (E) Cypripedium parviflorum var. makasin greater yellow lady's slipper Orchidaceae Forb/herb MA (E), NY (EV) Cypripedium parviflorum var. parviflorum lesser yellow lady's slipper Orchidaceae Forb/herb GA (), IN (), OH (), RI () Cypripedium calceolus var. parviflorum GA (U), IN (R), OH (E), RI (E) Cypripedium parviflorum var. pubescens greater yellow lady's slipper Orchidaceae Forb/herb NY (EV) Cypripedium calceolus var. pubescens AZ (HS), GA (U), NM (E), RI (E) Cypripedium pubescens NH (T), PA (V) showy lady's slipper Orchidaceae Forb/herb AR (E), CT (E), IA (T), IL (E), KY (H), MA (SC), MD (E, X), ME (T), NH (E), NJ (E), NY (EV), OH (T), PA (T), TN (E) Cyrtopodium punctatum cowhorn orchid Orchidaceae Forb/herb FL (E) Cystopteris bulbifera bulblet bladderfern Dryopteridaceae Forb/herb NY (EV) Cystopteris fragilis brittle bladderfern Dryopteridaceae Forb/herb NY (EV), OH (PRX) Cystopteris laurentiana St. Lawrence bladderfern Dryopteridaceae Forb/herb IL (E), PA (E) Cystopteris protrusa lowland bladderfern Dryopteridaceae Forb/herb NY (E) Cystopteris tennesseensis Tennessee bladderfern Dryopteridaceae Forb/herb NC (E, SC) Cystopteris tenuis upland brittle bladderfern Dryopteridaceae Forb/herb NY (EV) Dactylorhiza viridis longbract frog orchid Orchidaceae Forb/herb AZ (), CT (), IN (), KY (), MD (), NY (), OH (), RI (), TN () Coeloglossum viride AZ (SR), MD (E), NY (EV), OH (E) Coeloglossum viride var. virescens CT (SC), IN (T), KY (H), RI (T), TN (E) Dalbergia brownei Brown's Indian rosewood Fabaceae Vine, Shrub FL (E) Dalea candida white prairie clover Fabaceae Subshrub, TN (E) Forb/herb Dalea carthagenensis Cartagena prairie clover Fabaceae Shrub FL (E) Dalea foliosa leafy prairie clover Fabaceae Forb/herb Endangered IL (E), TN (E) Dalea phleoides var. microphylla slimspike prairie clover Fabaceae Subshrub, AR (T) Forb/herb Dalea purpurea purple prairie clover Fabaceae Subshrub, KY (SC), Forb/herb MI (PREX), OH (PRX), TN (E) Dalea tentaculoides Gentry's indigobush Fabaceae Subshrub AZ (HS) Dalea villosa silky prairie clover Fabaceae Subshrub, IA (E) Forb/herb Dalea villosa var. grisea silky prairie clover Fabaceae Subshrub, AR (E) Forb/herb Dalibarda repens robin runaway Rosaceae Forb/herb CT (E), MI (T), NC (E), NJ (E), OH (T), RI (E) Damasonium californicum California damsonium Alismataceae Forb/herb WA (S) Danthonia compressa flattened oatgrass Poaceae Graminoid MI (E) Danthonia epilis Carolina oatgrass Poaceae Graminoid TN (SC) Dasiphora fruticosa shrubby cinquefoil Rosaceae Shrub Potentilla fruticosa IA (T), PA (E) Dasiphora fruticosa ssp. floribunda shrubby cinquefoil Rosaceae Shrub IA (), PA () Dasistoma macrophylla mullein foxglove Scrophulariaceae Forb/herb MI (T) Dasylirion wheeleri common sotol Liliaceae Subshrub, Shrub AZ (SR) Decodon verticillatus swamp loosestrife Lythraceae Subshrub, Shrub IA (E) Dedeckera eurekensis July gold Polygonaceae Shrub CA (R) Deeringothamnus pulchellus royal false pawpaw Annonaceae Subshrub Endangered FL (E)

Deeringothamnus rugelii Rugel's false pawpaw Annonaceae Subshrub Endangered FL (E) arida Red Rock tarweed Asteraceae Forb/herb CA () arida CA (R) Deinandra conjugens Otay tarweed Asteraceae Forb/herb Threatened Hemizonia conjugens CA (E) Deinandra increscens ssp. villosa Gaviota tarplant Asteraceae Forb/herb Endangered Hemizonia increscens ssp. villosa CA (E) Deinandra minthornii Santa Susana tarweed Asteraceae Shrub CA () Hemizonia minthornii CA (R) Deinandra mohavensis Mojave tarweed Asteraceae Forb/herb CA () Hemizonia mohavensis CA (E) Delphinium bakeri Baker's delphinium Ranunculaceae Forb/herb Endangered CA (R) Delphinium carolinianum Carolina larkspur Ranunculaceae Forb/herb FL (E), KY (T) Delphinium exaltatum tall larkspur Ranunculaceae Forb/herb MD (E), NC (E, SC), PA (E), TN (E) Delphinium hesperium ssp. cuyamacae foothill larkspur Ranunculaceae Forb/herb CA (R) Delphinium luteum yellow larkspur Ranunculaceae Forb/herb Endangered CA (R) Delphinium nuttallii ssp. ochroleucum upland larkspur Ranunculaceae Forb/herb OR (), WA () Delphinium leucophaeum OR (E), WA (E) Delphinium ×pavonaceum peacock larkspur Ranunculaceae Forb/herb OR (E) Delphinium variegatum ssp. kinkiense royal larkspur Ranunculaceae Forb/herb Endangered CA (E) Delphinium viridescens Wenatchee larkspur Ranunculaceae Forb/herb WA (T) Dendrophylax lindenii palmpolly Orchidaceae Forb/herb FL () Polyrrhiza lindenii FL (E) Dennstaedtia bipinnata cuplet fern Dennstaedtiaceae Forb/herb FL (E) Dennstaedtia punctilobula eastern hayscented fern Dennstaedtiaceae Forb/herb IL (E), MI (PREX) Deparia acrostichoides silver false spleenwort Dryopteridaceae Forb/herb NY (EV) Deschampsia cespitosa tufted hairgrass Poaceae Graminoid IN (R), MD (E) Deschampsia caespitosa CT (SC) Deschampsia cespitosa ssp. glauca KY (E), MA (E) Deschampsia flexuosa wavy hairgrass Poaceae Graminoid KY (T) Descurainia incana mountain tansymustard Brassicaceae Forb/herb ME (PX) Descurainia pinnata western tansymustard Brassicaceae Forb/herb OH (T) Descurainia pinnata ssp. brachycarpa western tansymustard Brassicaceae Forb/herb NY (E) Desmodium ciliare hairy small-leaf ticktrefoil Fabaceae Forb/herb NY (T), RI (T) Desmodium cuspidatum largebract ticktrefoil Fabaceae Forb/herb MA (T), VT (E) Desmodium glabellum Dillenius' ticktrefoil Fabaceae Forb/herb CT (SC) Desmodium humifusum eastern trailing ticktrefoil Fabaceae Forb/herb CT (SC), IN (E), MA (E), MD (E, X), NJ (E), NY (E) Desmodium illinoense Illinois ticktrefoil Fabaceae Forb/herb OH (PRX) Desmodium laevigatum smooth ticktrefoil Fabaceae Forb/herb NY (E) Desmodium lineatum sand ticktrefoil Fabaceae Forb/herb MD (E) Desmodium marilandicum smooth small-leaf ticktrefoil Fabaceae Forb/herb NH (E) Desmodium nuttallii Nuttall's ticktrefoil Fabaceae Subshrub, NY (E) Forb/herb Desmodium obtusum stiff ticktrefoil Fabaceae Forb/herb NY (E) Desmodium rigidum MD (E), NH (E) Desmodium ochroleucum cream ticktrefoil Fabaceae Forb/herb FL (E), MD (E), TN (E) Desmodium pauciflorum fewflower ticktrefoil Fabaceae Forb/herb MD (E), NJ (E), NY (E) Desmodium rotundifolium prostrate ticktrefoil Fabaceae Forb/herb NH (T), VT (T) Desmodium sessilifolium sessileleaf ticktrefoil Fabaceae Forb/herb CT (SC), MD (E, X), NJ (E), OH (E), PA (X), RI (T) Desmodium strictum pine barren ticktrefoil Fabaceae Forb/herb MD (E) Diamorpha smallii elf orpine Crassulaceae Forb/herb TN (E) Diapensia lapponica pincushion plant Diapensiaceae Subshrub ME (SC), NH (T), NY (T), VT (E) Diarrhena americana American beakgrain Poaceae Graminoid MD (E), MI (T), WI (E) Diarrhena obovata obovate beakgrain Poaceae Graminoid NY (E), PA (E) Dicentra canadensis squirrel corn Fumariaceae Forb/herb CT (T), ME (T), NH (T), NJ (E) Dicentra eximia turkey corn Fumariaceae Forb/herb MD (T), NJ (E), PA (E)

Dicerandra christmanii Lake Wales balm Lamiaceae Subshrub, Endangered FL (E) Forb/herb longspur balm Lamiaceae Forb/herb Endangered FL (E) Dicerandra frutescens scrub balm Lamiaceae Forb/herb Endangered FL (E) Dicerandra immaculata spotless balm Lamiaceae Forb/herb Endangered FL (E) Dicerandra ×thinicola balm Lamiaceae Subshrub, FL (E) Forb/herb Dichanthelium aciculare needleleaf rosette grass Poaceae Graminoid NJ (), TN () Panicum aciculare NJ (E), TN (E) Dichanthelium acuminatum var. fasciculatum western panicgrass Poaceae Graminoid IN (), TN () Panicum curtifolium TN (E) Panicum subvillosum IN (X) Dichanthelium acuminatum var. lindheimeri Lindheimer panicgrass Poaceae Graminoid OH () Panicum lindheimeri OH (E) Dichanthelium acuminatum var. thermale Geysers panicgrass Poaceae Graminoid CA () Dichanthelium lanuginosum var. thermale CA (E) Dichanthelium boreale northern panicgrass Poaceae Graminoid IA (E), KY (SC) Panicum bicknellii IN (E), OH (T) Panicum boreale IL (E), IN (R), MD (E, X), NJ (E), OH (T) Panicum calliphyllum OH (PRX) Dichanthelium commutatum variable panicgrass Poaceae Graminoid IL () Panicum joorii IL (E) Dichanthelium dichotomum var. dichotomum cypress panicgrass Poaceae Graminoid FL (), IL (), IN (), MA (), OH (), PA () Dichanthelium dichotomum ssp. mattamuskeetense MA (E) Panicum annulum IN (E), PA (E) Panicum lucidum IN (E), PA (E) Panicum mattamuskeetense IN (X) Panicum nudicaule FL (T) Panicum yadkinense IL (E), IN (T), OH (E) Dichanthelium dichotomum var. ensifolium cypress panicgrass Poaceae Graminoid TN () Panicum ensifolium TN (SC) Dichanthelium hirstii Hirst's panicgrass Poaceae Graminoid GA (), NC (), NJ () Panicum hirstii GA (E), NC (E), NJ (E) Dichanthelium laxiflorum openflower rosette grass Poaceae Graminoid PA () Panicum laxiflorum PA (E) Dichanthelium leibergii Leiberg's panicum Poaceae Graminoid IN (), MI (), NY (), OH (), PA () Panicum leibergii IN (T), MI (T), NY (E), OH (T), PA (X) Dichanthelium leucothrix rough panicgrass Poaceae Graminoid TN () Panicum acuminatum var. leucothrix TN (SC) Dichanthelium linearifolium slimleaf panicgrass Poaceae Graminoid IA (T) Panicum perlongum OH (E) Dichanthelium meridionale matting rosette grass Poaceae Graminoid OH () Panicum meridionale OH (T) Dichanthelium oligosanthes var. oligosanthes Heller's rosette grass Poaceae Graminoid NY () Panicum oligosanthes NY (E) Dichanthelium oligosanthes var. scribnerianum Scribner's rosette grass Poaceae Graminoid NY (), PA () Panicum scoparium NY (E), PA (E) Dichanthelium ovale var. addisonii Addison's rosette grass Poaceae Graminoid IN (), OH (), PA () Panicum commonsianum OH (E), PA (X) Panicum commonsianum var. addisonii IN (R) Dichanthelium ravenelii Ravenel's rosette grass Poaceae Graminoid IL () Panicum ravenelii IL (E) Dichanthelium sabulorum var. patulum hemlock rosette grass Poaceae Graminoid PA () Panicum commonsianum var. euchlamydeum PA (E) Dichanthelium sabulorum var. thinium hemlock rosette grass Poaceae Graminoid IL (), IN () Panicum columbianum IL (E), IN (R) Dichanthelium scabriusculum woolly rosette grass Poaceae Graminoid MA (T) Panicum scabriusculum CT (E), MD (E), NY (E) Dichanthelium scoparium velvet panicum Poaceae Graminoid IN () Panicum scoparium IN (E) Dichanthelium sphaerocarpon var. isophyllum roundseed panicgrass Poaceae Graminoid MI () Panicum polyanthes MI (E) Dichanthelium sphaerocarpon var. sphaerocarpon roundseed panicgrass Poaceae Graminoid CT (), NH () Panicum sphaerocarpon CT (SC), NH (E) Dichanthelium spretum Eaton's rosette grass Poaceae Graminoid OH (), PA (), TN () Panicum acuminatum var. densiflorum TN (E) Panicum spretum OH (E), PA (E) Dichanthelium villosissimum var. praecocius whitehair rosette grass Poaceae Graminoid OH () Panicum praecocius OH (E) Dichanthelium villosissimum var. villosissimum whitehair rosette grass Poaceae Graminoid MA (), OH () Dichanthelium ovale ssp. pseudopubescens MA (SC) Panicum villosissimum OH (PRX) Dichanthelium wilcoxianum fall rosette grass Poaceae Graminoid IN () Panicum wilcoxianum IN (R) Dichanthelium wrightianum Wright's rosette grass Poaceae Graminoid MA (SC) Panicum wrightianum MD (E), NY (E), RI (SC) Dichanthelium xanthophysum slender rosette grass Poaceae Graminoid CT (), NJ (), PA () Panicum xanthophysum CT (SC), NJ (E), PA (E) Dichelostemma capitatum ssp. pauciflorum bluedicks Liliaceae Forb/herb AZ () Dichelostemma pulchellum var. pauciflorum AZ (SR) Dicliptera brachiata branched foldwing Acanthaceae Forb/herb IN (E) Didiplis diandra waterpurslane Lythraceae Forb/herb IN (R), KY (SC), TN (T) Diervilla lonicera northern bush honeysuckle Caprifoliaceae Shrub IN (R), TN (T) Diervilla rivularis mountain bush honeysuckle Caprifoliaceae Shrub TN () Diervilla sessilifolia var. rivularis TN (T) Digitaria cognata fall witchgrass Poaceae Graminoid PA (T) Digitaria dolichophylla Caribbean crabgrass Poaceae Graminoid FL (T) Digitaria filiformis slender crabgrass Poaceae Graminoid MI (PREX), NY (T), OH (PRX) Digitaria pauciflora twospike crabgrass Poaceae Graminoid FL (E) Digitaria villosa shaggy crabgrass Poaceae Graminoid MD (E, X) Dioclea multiflora Boykin's clusterpea Fabaceae Vine IL () Galactia mohlenbrockii IL (E) Diodia virginiana Virginia buttonweed Rubiaceae Subshrub, IN (T), NJ (E) Forb/herb Dionaea muscipula Venus flytrap Droseraceae Forb/herb NC (SC) Diospyros virginiana common persimmon Ebenaceae Tree CT (SC), NY (T) Diplazium pycnocarpon glade fern Dryopteridaceae Forb/herb CT (E), MD (T), MN (T), NH (E), NY (EV) Athyrium pycnocarpon NJ (E) Dirca palustris eastern leatherwood Thymelaeaceae Shrub FL (E), MD (T) Distichlis spicata saltgrass Poaceae Graminoid PA (X) Dithyrea maritima beach shieldpod Brassicaceae Forb/herb CA (T) Dodecahema leptoceras slenderhorn spineflower Polygonaceae Forb/herb Endangered CA (E) Dodecatheon alpinum ssp. majus alpine shootingstar Primulaceae Forb/herb AZ (SR) Dodecatheon amethystinum jeweled shootingstar Primulaceae Forb/herb IA (T), PA (T) Dodecatheon austrofrigidum tundra shootingstar Primulaceae Forb/herb WA (T) Dodecatheon dentatum ssp. ellisiae Ellis' shootingstar Primulaceae Forb/herb AZ (SR) Dodecatheon frenchii French's shootingstar Primulaceae Forb/herb AR (T), IN (R), KY (SC) Dodecatheon meadia pride of Primulaceae Forb/herb FL (E), MI (E), MN (E), PA (E) Dodecatheon pulchellum darkthroat shootingstar Primulaceae Forb/herb AZ (SR) Dodonaea viscosa Florida hopbush Sapindaceae Tree, Shrub FL () Dodonaea elaeagnoides FL (E) Doellingeria infirma cornel-leaf whitetop Asteraceae Forb/herb MA (E) Aster infirmus RI (H) Downingia concolor var. brevior maroonspot calicoflower Campanulaceae Forb/herb CA (E) Draba aprica openground draba Brassicaceae Forb/herb AR (T), GA (E) Draba arabisans rock draba Brassicaceae Forb/herb ME (T), NY (T) Draba aurea golden draba Brassicaceae Forb/herb WA (S) Draba brachycarpa shortpod draba Brassicaceae Forb/herb OH (E) Draba breweri var. cana cushion draba Brassicaceae Forb/herb ME (), MI (), NH (), VT (), WA (), WI () Draba cana ME (E), MI (T), VT (T), WA (S) Draba lanceolata NH (E), WI (E) Draba cuneifolia wedgeleaf draba Brassicaceae Forb/herb IL (E), KY (E), OH (T), TN (SC) Draba glabella smooth draba Brassicaceae Forb/herb MI (E), NY (E), VT (T) Draba incana twisted draba Brassicaceae Forb/herb MI (T) Draba juvenilis longstalk draba Brassicaceae Forb/herb WA () Draba longipes WA (S) Draba nemorosa woodland draba Brassicaceae Forb/herb MI (PREX) Draba norvegica Norwegian draba Brassicaceae Forb/herb MN (E) Draba ramosissima branched draba Brassicaceae Forb/herb TN (SC) Draba reptans Carolina draba Brassicaceae Forb/herb CT (SC), MI (T), NJ (E), NY (T), OH (T), PA (X), RI (H) Dracocephalum parviflorum American dragonhead Lamiaceae Forb/herb NY (E), VT (T) Drosera anglica English sundew Droseraceae Forb/herb ME (E), WI (T) Drosera brevifolia dwarf sundew Droseraceae Forb/herb KY (E), TN (T) Drosera capillaris pink sundew Droseraceae Forb/herb MD (E), TN (T) Drosera filiformis threadleaf sundew Droseraceae Forb/herb CT (SC), FL (E), NY (R), RI (H) Drosera intermedia spoonleaf sundew Droseraceae Forb/herb FL (T), IL (T), IN (R), KY (H), NY (EV), OH (E) Drosera linearis slenderleaf sundew Droseraceae Forb/herb ME (E), WI (T) Drosera rotundifolia roundleaf sundew Droseraceae Forb/herb IA (E), IL (E), NY (EV), TN (T) Dryas drummondii Drummond's mountain-avens Rosaceae Subshrub, Shrub, WA (S) Forb/herb Dryopteris ×australis woodfern Dryopteridaceae Forb/herb TN (SC) Dryopteris campyloptera mountain woodfern Dryopteridaceae Forb/herb CT (E), MD (E), NY (EV), PA (E) Dryopteris carthusiana spinulose woodfern Dryopteridaceae Forb/herb AR (T), KY (SC), NY (EV), TN (T) Dryopteris celsa log fern Dryopteridaceae Forb/herb IL (E), IN (X), MD (T), MI (T), NY (E), OH (E), PA (E) Dryopteris clintoniana Clinton's woodfern Dryopteridaceae Forb/herb IN (X), NY (EV), OH (E), PA (T) Dryopteris cristata crested woodfern Dryopteridaceae Forb/herb NY (EV), TN (T), WA (S) Dryopteris filix-mas male fern Dryopteridaceae Forb/herb ME (E), VT (T) Dryopteris fragrans fragrant woodfern Dryopteridaceae Forb/herb ME (SC), NH (T), NY (E) Dryopteris goldieana Goldie's woodfern Dryopteridaceae Forb/herb CT (SC), ME (SC), NH (T), NY (EV) Dryopteris intermedia intermediate woodfern Dryopteridaceae Forb/herb IA (T), NY (EV) Dryopteris ludoviciana southern woodfern Dryopteridaceae Forb/herb KY (H) Dryopteris marginalis marginal woodfern Dryopteridaceae Forb/herb IA (T), MN (T), NY (EV) Drypetes diversifolia milkbark Euphorbiaceae Tree, Shrub FL (E) Drypetes lateriflora guiana plum Euphorbiaceae Tree, Shrub FL (T) Dudleya blochmaniae ssp. brevifolia shortleaf liveforever Crassulaceae Forb/herb CA (E) Dudleya collomiae Gila County liveforever Crassulaceae Forb/herb AZ () Dudleya saxosa ssp. collomiae AZ (SR) Dudleya cymosa ssp. marcescens marcescent dudleya Crassulaceae Forb/herb Threatened CA (R) Dudleya nesiotica Santa Cruz Island liveforever Crassulaceae Forb/herb Threatened CA (R) Dudleya pulverulenta ssp. arizonica chalk dudleya Crassulaceae Forb/herb AZ (SR) Dudleya stolonifera Laguna Beach liveforever Crassulaceae Forb/herb Threatened CA (R)

Dudleya traskiae Santa Barbara Island liveforever Crassulaceae Forb/herb Endangered CA (E) Eatonella nivea white false tickhead Asteraceae Forb/herb WA (T) Echeandia flavescens Torrey's craglily Liliaceae Forb/herb AZ (SR) Echinacea laevigata smooth purple coneflower Asteraceae Forb/herb Endangered GA (E), NC (E, SC), PA (X) Echinacea pallida pale purple coneflower Asteraceae Forb/herb TN (T), WI (T) Echinacea paradoxa Bush's purple coneflower Asteraceae Forb/herb AR (T) Echinacea purpurea eastern purple coneflower Asteraceae Forb/herb FL (E), MI (PREX) Echinacea sanguinea sanguine purple coneflower Asteraceae Forb/herb AR (T) Echinacea simulata wavyleaf purple coneflower Asteraceae Forb/herb TN (T) Tennessee purple coneflower Asteraceae Forb/herb Endangered TN (E) Echinocactus horizonthalonius devilshead Cactaceae Shrub AZ (SR) Echinocactus horizonthalonius var. nicholii Nichol's echinocactus Cactaceae Shrub Endangered AZ (HS) Echinocactus polycephalus var. polycephalus cottontop cactus Cactaceae Shrub AZ (SR), NV (CY) Echinocactus polycephalus var. xeranthemoides cottontop cactus Cactaceae Shrub AZ (SR), NV (CY) Echinocereus bonkerae pinkflower hedgehog cactus Cactaceae Shrub AZ () Echinocereus fasciculatus var. bonkerae AZ (SR) Echinocereus boyce-thompsonii Boyce Thompson hedgehog cactus Cactaceae Shrub AZ () Echinocereus fasciculatus var. boyce-thompsonii AZ (SR) Echinocereus fendleri var. boyce-thompsonii AZ (SR) Echinocereus chisoensis Chisos Mountain hedgehog cactus Cactaceae Shrub Threatened TX (T) Echinocereus coccineus var. arizonicus Arizona hedgehog cactus Cactaceae Shrub AZ () Echinocereus triglochidiatus var. arizonicus Endangered AZ (HS) Echinocereus triglochidiatus var. neomexicanus AZ (SR) Echinocereus coccineus var. coccineus scarlet hedgehog cactus Cactaceae Shrub AZ () Echinocereus triglochidiatus var. melanacanthus AZ (SR) Echinocereus dasyacanthus spiny hedgehog cactus Cactaceae Shrub AZ () Echinocereus pectinatus var. neomexicanus AZ (SR) Echinocereus engelmannii Engelmann's hedgehog cactus Cactaceae Shrub NV (CY) Echinocereus engelmannii var. acicularis Engelmann's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus engelmannii var. armatus Engelmann's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus engelmannii var. chrysocentrus Engelmann's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus engelmannii var. engelmannii Engelmann's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus engelmannii var. variegatus Engelmann's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus fasciculatus pinkflower hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus fendleri ssp. fendleri pinkflower hedgehog cactus Cactaceae Shrub AZ (), NM () Echinocereus fendleri var. fendleri AZ (SR) Echinocereus fendleri var. kuenzleri Endangered NM (E) Echinocereus fendleri ssp. rectispinus pinkflower hedgehog cactus Cactaceae Shrub AZ () Echinocereus fendleri var. rectispinus AZ (SR) Echinocereus ledingii Leding's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus mojavensis Mojave kingcup cactus Cactaceae Shrub AZ () Echinocereus triglochidiatus var. mojavensis AZ (SR) Echinocereus nicholii Nichol's hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus polyacanthus Mojave mound cactus Cactaceae Shrub AZ (SR) Echinocereus pseudopectinatus devilthorn Cactaceae Shrub AZ (SR) Echinocereus reichenbachii ssp. fitchii Fitch's hedgehog cactus Cactaceae Shrub TX () Echinocereus reichenbachii var. albertii Endangered TX (E) Echinocereus rigidissimus rainbow hedgehog cactus Cactaceae Shrub AZ (SR) Echinocereus ×roetteri Lloyd's hedgehog cactus Cactaceae Shrub NM () Echinocereus ×lloydii NM (E) Echinocereus triglochidiatus kingcup cactus Cactaceae Shrub NV (CY) Echinocereus triglochidiatus var. triglochidiatus kingcup cactus Cactaceae Shrub AZ (SR) Echinocereus triglochidiatus var. gonacanthus AZ (SR) Echinocereus viridiflorus var. davisii Davis' hedgehog cactus Cactaceae Shrub Endangered TX (E) Echinochloa walteri coast cockspur grass Poaceae Graminoid PA (E) Echinodorus berteroi upright burhead Alismataceae Forb/herb IN (X), KY (T) Echinodorus rostratus OH (E), TN (SC) Echinodorus cordifolius creeping burhead Alismataceae Forb/herb IN (X), MD (E) Echinodorus floridanus Florida burhead Alismataceae Forb/herb FL (E) Echinodorus tenellus mudbabies Alismataceae Forb/herb IL (E), MI (E) Echinodorus parvulus IN (E), KY (E) Echinodorus tenellus var. parvulus CT (E) Echinomastus erectocentrus redspine fishhook cactus Cactaceae Shrub AZ (SR) Echinomastus erectocentrus var. acunensis AZ (HS) Echinomastus intertextus white fishhook cactus Cactaceae Shrub AZ (SR) Echinomastus johnsonii Johnson's fishhook cactus Cactaceae Shrub AZ (SR) Neolloydia johnsonii NV (CY) Echinomastus mariposensis Lloyd's fishhook cactus Cactaceae Shrub Threatened Neolloydia mariposensis TX (T) Eclipta prostrata false daisy Asteraceae Forb/herb NY (E) Elatine americana American waterwort Elatinaceae Forb/herb MA (E), NY (E), PA (E) Elatine triandra var. americana RI (SC) Elatine minima small waterwort Elatinaceae Forb/herb MD (E), PA (R) Elatine triandra threestamen waterwort Elatinaceae Forb/herb OH (PRX) Eleocharis albida white spikerush Cyperaceae Graminoid MD (E) Eleocharis atropurpurea purple spikerush Cyperaceae Graminoid MI (E), WA (PX) Eleocharis brittonii Britton's spikerush Cyperaceae Graminoid NJ (E) Eleocharis compressa flatstem spikerush Cyperaceae Graminoid MD (E), MI (T), NJ (E), PA (E) Eleocharis diandra Wright's spikerush Cyperaceae Graminoid MA (E) Eleocharis elliptica elliptic spikerush Cyperaceae Graminoid PA (E) Eleocharis engelmannii Engelmann's spikerush Cyperaceae Graminoid ME (PX), NY (E), OH (E) Eleocharis equisetoides jointed spikesedge Cyperaceae Graminoid CT (E), IN (E), MD (E), NJ (E), NY (T), RI (SC), TN (E) Eleocharis fallax creeping spikerush Cyperaceae Graminoid NY (E), RI (H) Eleocharis geniculata Canada spikesedge Cyperaceae Graminoid IN (T) Eleocharis caribaea MI (T), OH (E), PA (E) Eleocharis halophila saltmarsh spikerush Cyperaceae Graminoid MD (E), NC (T), NH (T), NY (T) Eleocharis intermedia matted spikerush Cyperaceae Graminoid MA (T), MD (E), PA (T), TN (SC) Eleocharis lanceolata daggerleaf spikerush Cyperaceae Graminoid TN (SC) Eleocharis melanocarpa blackfruit spikerush Cyperaceae Graminoid IN (T), MD (E), NJ (E), RI (E) Eleocharis microcarpa smallfruit spikerush Cyperaceae Graminoid IN (E), MI (E) Eleocharis microcarpa var. filiculmis CT (SC), MA (E) Eleocharis minima small spikerush Cyperaceae Graminoid NJ (E) Eleocharis nitida quill spikerush Cyperaceae Graminoid MI (E), MN (T), WI (E) Eleocharis obtusa blunt spikerush Cyperaceae Graminoid PA () Eleocharis obtusa var. peasei PA (E) Eleocharis olivacea bright green spikerush Cyperaceae Graminoid IL (E), KY (SC), MN (T), OH (T), PA (R) Eleocharis parvula dwarf spikerush Cyperaceae Graminoid MI (T), NH (T), OH (E), PA (E) Eleocharis quadrangulata squarestem spikerush Cyperaceae Graminoid NY (E), PA (E), WI (E) Eleocharis quadrangulata var. crassior CT (E) Eleocharis quinqueflora fewflower spikerush Cyperaceae Graminoid MA (E), ME (E) Eleocharis pauciflora IL (E), NJ (E), OH (T), VT (T) Eleocharis pauciflora var. fernaldii NH (E), PA (E) Eleocharis radicans rooted spikerush Cyperaceae Graminoid MI (PREX) Eleocharis robbinsii Robbins' spikerush Cyperaceae Graminoid IN (R), MD (E), PA (T) Eleocharis rostellata beaked spikerush Cyperaceae Graminoid FL (E), IL (T), ME (PX), MN (T), PA (E), RI (SC), WA (S), WI (T) Eleocharis tenuis var. pseudoptera slender spikerush Cyperaceae Graminoid NY () Eleocharis elliptica var. pseudoptera NY (E) Eleocharis tenuis var. verrucosa slender spikerush Cyperaceae Graminoid NJ (E), PA (E) Eleocharis tortilis twisted spikerush Cyperaceae Graminoid NJ (E), TN (SC) Eleocharis tricostata three-angle spikerush Cyperaceae Graminoid MA (E), MD (E, X), MI (T), NY (E), PA (X), RI (E) Eleocharis tuberculosa cone-cup spikerush Cyperaceae Graminoid ME (E), NH (E), NY (T), PA (X) Eleocharis wolfii Wolf's spikerush Cyperaceae Graminoid IN (R), MN (E), OH (E), TN (SC) Elephantopus carolinianus Carolina elephantsfoot Asteraceae Forb/herb NJ (E), PA (E) Elephantopus tomentosus devil's grandmother Asteraceae Forb/herb MD (E) georgiaplume Ericaceae Tree, Shrub GA (T) Ellisia nyctelea Aunt Lucy Hydrophyllaceae Forb/herb NJ (E), PA (T) Elodea nuttallii western waterweed Forb/herb KY (T), TN (SC) Elodea schweinitzii Schweinitz's waterweed Hydrocharitaceae Forb/herb PA (X) Eltroplectris calcarata longclaw orchid Orchidaceae Forb/herb FL (E) Elymus hystrix eastern bottlebrush grass Poaceae Graminoid ME (T) Elymus lanceolatus ssp. psammophilus Great Lakes wheatgrass Poaceae Graminoid WI (T) Elymus svensonii Svenson's wildrye Poaceae Graminoid KY (SC), TN (E) Elymus trachycaulus slender wheatgrass Poaceae Graminoid NJ (E), OH (T) Elymus trachycaulus ssp. subsecundus slender wheatgrass Poaceae Graminoid CT (SC) Elymus trachycaulus ssp. trachycaulus slender wheatgrass Poaceae Graminoid MD () Agropyron trachycaulum MD (E, X) Elymus villosus hairy wildrye Poaceae Graminoid MA (E), RI (SC) Elymus wiegandii Wiegand's wildrye Poaceae Graminoid CT (SC) Empetrum eamesii purple crowberry Empetraceae Subshrub, Shrub MN (E) Empetrum eamesii ssp. atropurpureum purple crowberry Empetraceae Subshrub, Shrub NY (E) Empetrum atropurpureum NH (T) Empetrum nigrum black crowberry Empetraceae Subshrub, Shrub MI (T), MN (E) Empetrum nigrum ssp. hermaphroditum black crowberry Empetraceae Subshrub, Shrub NY (R) Enceliopsis nudicaulis var. corrugata nakedstem sunray Asteraceae Subshrub, Threatened NV (FP) Forb/herb Encyclia tampensis Tampa butterfly orchid Orchidaceae Forb/herb FL (CE) Enemion biternatum eastern false rue anemone Ranunculaceae Forb/herb FL () Isopyrum biternatum FL (E) Epidendrum acunae Acuna's star orchid Orchidaceae Forb/herb FL (E) Epidendrum amphistomum big-mouth star orchid Orchidaceae Forb/herb FL () Epidendrum anceps FL (E) Epidendrum boricuarum fleshy star orchid Orchidaceae Forb/herb FL () Epidendrum difforme FL (E) Epidendrum magnoliae var. magnoliae green orchid Orchidaceae Forb/herb FL (), GA () Epidendrum conopseum FL (CE), GA (U) Epidendrum nocturnum night scented orchid Orchidaceae Forb/herb FL (E) Epidendrum rigidum stiff flower star orchid Orchidaceae Forb/herb FL (E) Epidendrum strobiliferum big cypress star orchid Orchidaceae Forb/herb FL (E) trailing arbutus Ericaceae Subshrub, Shrub FL (E), NY (EV) Epilobium anagallidifolium pimpernel willowherb Onagraceae Forb/herb ME (E) Epilobium ciliatum fringed willowherb Onagraceae Forb/herb IN (E), MD (E), NH (T), TN (SC) Epilobium ciliatum ssp. glandulosum fringed willowherb Onagraceae Forb/herb NY (E) Epilobium hornemannii Hornemann's willowherb Onagraceae Forb/herb ME (E), NH (T), NY (E) Epilobium leptophyllum bog willowherb Onagraceae Forb/herb TN (T) Epilobium palustre marsh willowherb Onagraceae Forb/herb RI (T) Epilobium strictum downy willowherb Onagraceae Forb/herb IL (T), MD (E), OH (T), PA (E) Epipactis gigantea stream orchid Orchidaceae Forb/herb AZ (SR) Epithelantha micromeris pingpong-ball cactus Cactaceae Shrub AZ (SR) Equisetum ×ferrissii Equisetaceae Forb/herb PA (E) Equisetum fluviatile water horsetail Equisetaceae Forb/herb MD (E), RI (SC) Equisetum hyemale var. affine scouringrush horsetail Equisetaceae Forb/herb RI () Equisetum hyemale ssp. affine RI (SC) Equisetum laevigatum smooth horsetail Equisetaceae Forb/herb NY (E) Equisetum palustre marsh horsetail Equisetaceae Forb/herb CT (SC), NH (T), NY (T), VT (T) Equisetum pratense meadow horsetail Equisetaceae Forb/herb CT (SC), IL (T), NH (T), NJ (E), NY (T) Equisetum scirpoides dwarf scouringrush Equisetaceae Forb/herb CT (E), IL (E), MA (SC) Equisetum sylvaticum woodland horsetail Equisetaceae Forb/herb IA (T), IL (E), MD (E), RI (SC) Equisetum telmateia giant horsetail Equisetaceae Forb/herb MI (PREX) Equisetum variegatum variegated scouringrush Equisetaceae Forb/herb IN (E), ME (SC), NJ (E), OH (T), PA (E) Eragrostis capillaris lace grass Poaceae Graminoid ME (E) Eragrostis frankii sandbar lovegrass Poaceae Graminoid MA (SC) Eragrostis hypnoides teal lovegrass Poaceae Graminoid ME (PX) Eragrostis pectinacea var. tracyi Sanibel Island lovegrass Poaceae Graminoid FL () Eragrostis tracyi FL (E) Eragrostis refracta coastal lovegrass Poaceae Graminoid MD (T) Erechtites hieraciifolius var. megalocarpus American burnweed Asteraceae Forb/herb NY (E) Eremocrinum albomarginatum lonely lily Liliaceae Forb/herb AZ (SR) Eriastrum brandegeeae Brandegee's woollystar Polemoniaceae Forb/herb CA () Eriastrum tracyi CA (R) Eriastrum densifolium ssp. sanctorum giant woollystar Polemoniaceae Forb/herb, Endangered CA (E) Subshrub Erigenia bulbosa harbinger of spring Apiaceae Forb/herb NY (E), PA (T), WI (E) Erigeron acris ssp. debilis bitter fleabane Asteraceae Forb/herb ME () Trimorpha acris ME (PX) Erigeron aliceae Alice Eastwood's fleabane Asteraceae Subshrub, WA (S) Forb/herb Erigeron basalticus basalt fleabane Asteraceae Forb/herb WA (T) Erigeron decumbens var. decumbens Willamette fleabane Asteraceae Forb/herb Endangered OR (E) Erigeron elatus swamp boreal-daisy Asteraceae Forb/herb WA () Trimorpha elata WA (S) Erigeron hessii Hess' fleabane Asteraceae Subshrub, NM (E) Forb/herb Erigeron howellii Howell's fleabane Asteraceae Forb/herb WA (T) Erigeron hyssopifolius hyssopleaf fleabane Asteraceae Forb/herb ME (SC), MI (T), NY (E) Erigeron kuschei Chiricahua fleabane Asteraceae Forb/herb AZ (SR) Erigeron lemmonii Lemmon's fleabane Asteraceae Forb/herb AZ (HS) Erigeron oreganus gorge fleabane Asteraceae Forb/herb WA (T) Erigeron peregrinus ssp. peregrinus var. thompsonii subalpine fleabane Asteraceae Forb/herb WA (S) Erigeron piperianus Piper's fleabane Asteraceae Forb/herb WA (S) Erigeron piscaticus Fish Creek fleabane Asteraceae Forb/herb AZ (SR) Erigeron rhizomatus fleabane Asteraceae Forb/herb Threatened NM (E) Erigeron salishii Star Peak fleabane Asteraceae Forb/herb WA (S) Eriocaulon aquaticum sevenangle pipewort Eriocaulaceae Forb/herb MD (E) Eriocaulon septangulare IN (E), OH (E) Eriocaulon decangulare tenangle pipewort Eriocaulaceae Forb/herb PA (X), TN (E) Eriocaulon koernickianum gulf pipewort Eriocaulaceae Forb/herb AR (E) Eriocaulon lineare narrow pipewort Eriocaulaceae Forb/herb NC (E) Eriocaulon nigrobracteatum blackbract pipewort Eriocaulaceae Forb/herb FL (E) Eriocaulon parkeri estuary pipewort Eriocaulaceae Forb/herb CT (T), MA (E), MD (T), ME (SC), PA (X) Eriodictyon altissimum Indian Knob mountainbalm Hydrophyllaceae Shrub Endangered CA (E) Eriodictyon capitatum Lompoc yerba santa Hydrophyllaceae Subshrub, Shrub Endangered CA (R) Eriogonum alpinum Trinity buckwheat Polygonaceae Subshrub, CA (E) Forb/herb Eriogonum apricum var. apricum Ione buckwheat Polygonaceae Forb/herb CA (E) Eriogonum apricum var. prostratum Irish Hill buckwheat Polygonaceae Forb/herb CA (R) Eriogonum argophyllum Sulphur Hot Springs buckwheat Polygonaceae Forb/herb NV (FP) Eriogonum butterworthianum Butterworth's buckwheat Polygonaceae Subshrub, Shrub, CA (R) Forb/herb Eriogonum capillare San Carlos buckwheat Polygonaceae Forb/herb AZ (SR)

Eriogonum chrysops buckwheat Polygonaceae Subshrub, OR (T) Forb/herb Eriogonum codium basalt desert buckwheat Polygonaceae Forb/herb WA (E) Eriogonum crocatum Conejo buckwheat Polygonaceae Subshrub, Shrub CA (R) Eriogonum crosbyae Crosby's buckwheat Polygonaceae Forb/herb OR (T) Eriogonum giganteum var. compactum Santa Barbara Island buckwheat Polygonaceae Subshrub, Shrub CA (R) Eriogonum grande var. timorum San Nicolas Island buckwheat Polygonaceae Subshrub, Shrub CA (E) Eriogonum gypsophilum Seven River Hills buckwheat Polygonaceae Subshrub, Threatened NM (E) Forb/herb Eriogonum heermannii var. apachense Apache buckwheat Polygonaceae Subshrub, Shrub AZ () Eriogonum apachense AZ (SR) Eriogonum kelloggii Red Mountain buckwheat Polygonaceae Subshrub, CA (E) Forb/herb Eriogonum longifolium var. gnaphalifolium longleaf buckwheat Polygonaceae Forb/herb Threatened Eriogonum floridanum FL (E) Eriogonum longifolium var. harperi Harper's buckwheat Polygonaceae Forb/herb TN (E) Eriogonum maculatum spotted buckwheat Polygonaceae Forb/herb WA (PX) Eriogonum mortonianum Fredonia buckwheat Polygonaceae Subshrub AZ (SR) Eriogonum ovalifolium var. williamsiae Williams' buckwheat Polygonaceae Subshrub, Endangered NV (FP) Forb/herb Eriogonum ripleyi Fraziers Well buckwheat Polygonaceae Subshrub, AZ (SR) Forb/herb Eriogonum thompsoniae var. atwoodii Atwood's buckwheat Polygonaceae Subshrub, AZ (SR) Forb/herb Eriogonum thornei Thorne's buckwheat Polygonaceae Forb/herb, CA () Subshrub Eriogonum ericifolium var. thornei CA (E) Eriogonum twisselmannii Twisselmann's buckwheat Polygonaceae Subshrub, CA (R) Forb/herb Eriogonum viscidulum sticky buckwheat Polygonaceae Forb/herb NV (FP) Eriophorum angustifolium tall cottongrass Cyperaceae Graminoid IN (R), NH (E) Eriophorum angustifolium ssp. angustifolium tall cottongrass Cyperaceae Graminoid NY () Eriophorum angustifolium ssp. scabriusculum NY (E) Eriophorum gracile slender cottongrass Cyperaceae Graminoid IA (T), IN (T), MA (T), NJ (E), OH (PRX), PA (E), RI (T) Eriophorum tenellum fewnerved cottongrass Cyperaceae Graminoid NJ (E), PA (E) Eriophorum vaginatum var. spissum tussock cottongrass Cyperaceae Graminoid CT (E), NJ (E), RI (H) Eriophorum spissum IN (X) Eriophorum virginicum tawny cottongrass Cyperaceae Graminoid IL (E), KY (E), TN (T) Eriophorum viridicarinatum thinleaf cottonsedge Cyperaceae Graminoid IN (R), PA (T), RI (SC), WA (S) Eriophyllum congdonii Congdon's woolly sunflower Asteraceae Forb/herb CA (R) Eriophyllum latilobum San Mateo woolly sunflower Asteraceae Subshrub, Endangered CA (E) Forb/herb Erithalis fruticosa blacktorch Rubiaceae Tree, Shrub FL (T) Eritrichium nanum var. elongatum arctic alpine forget-me-not Boraginaceae Forb/herb WA (S) Ernodea cokeri one-nerved ernodea Rubiaceae Shrub FL (E) Errazurizia rotundata roundleaf dunebroom Fabaceae Subshrub, Shrub AZ (SR) Eryngium aquaticum rattlesnakemaster Apiaceae Forb/herb PA (X) Eryngium aristulatum var. parishii Parish's eryngo Apiaceae Forb/herb Endangered CA (E) Eryngium articulatum beethistle Apiaceae Forb/herb WA (PX) Eryngium constancei Loch Lomond eryngo Apiaceae Forb/herb Endangered CA (E) Eryngium cuneifolium wedgeleaf eryngo Apiaceae Forb/herb Endangered FL (E) Eryngium integrifolium blueflower eryngo Apiaceae Forb/herb KY (E) Eryngium petiolatum rushleaf eryngo Apiaceae Forb/herb WA (T) Eryngium prostratum creeping eryngo Apiaceae Forb/herb IL (E) Eryngium racemosum delta eryngo Apiaceae Forb/herb CA (E) Eryngium yuccifolium button eryngo Apiaceae Forb/herb MD (E, X), MI (T), OH (T) sanddune wallflower Brassicaceae Forb/herb, IN (T), TN (E) Subshrub Erysimum capitatum var. angustatum Contra Costa wallflower Brassicaceae Forb/herb Endangered CA (E) Erysimum capitatum var. capitatum sanddune wallflower Brassicaceae Forb/herb OH () Erysimum arkansanum OH (E) Erysimum menziesii Menzies' wallflower Brassicaceae Forb/herb Endangered CA (E) Erysimum teretifolium Santa Cruz wallflower Brassicaceae Forb/herb Endangered CA (E) Erythronium albidum white fawnlily Liliaceae Forb/herb MD (T) Erythronium americanum dogtooth violet Liliaceae Forb/herb IA (T) Erythronium elegans Coast Range fawnlily Liliaceae Forb/herb OR (T) Erythronium mesochoreum midland fawnlily Liliaceae Forb/herb IL (T) Erythronium propullans fawnlily Liliaceae Forb/herb Endangered MN (E) Erythronium revolutum mahogany fawnlily Liliaceae Forb/herb WA (S) Erythronium rostratum yellow troutlily Liliaceae Forb/herb KY (SC), OH (E), TN (SC) Erythronium umbilicatum dimpled troutlily Liliaceae Forb/herb FL (E) Escobaria alversonii cushion foxtail cactus Cactaceae Shrub AZ () Coryphantha vivipara var. alversonii AZ (SR) Escobaria duncanii Duncan's foxtail cactus Cactaceae Shrub NM (E) Escobaria minima Nellie cory cactus Cactaceae Shrub TX () Coryphantha minima Endangered TX (E) Escobaria missouriensis Missouri foxtail cactus Cactaceae Shrub AZ () Coryphantha missouriensis AZ (SR) Escobaria orcuttii var. orcuttii Orcutt's foxtail cactus Cactaceae Shrub AZ () Coryphantha strobiliformis var. orcuttii AZ (SR) Escobaria organensis Organ Mountain foxtail cactus Cactaceae Shrub NM (E) Escobaria robbinsiorum Cochise foxtail cactus Cactaceae Shrub AZ () Coryphantha robbinsiorum Threatened AZ (HS) Escobaria sneedii var. leei Sneed's pincushion cactus Cactaceae Shrub NM (E) Escobaria sneedii var. sneedii Sneed's pincushion cactus Cactaceae Shrub NM (E) Coryphantha sneedii Endangered TX (E) Escobaria tuberculosa whitecolumn foxtail cactus Cactaceae Shrub AZ () Escobaria tuberculosa var. tuberculosa whitecolumn foxtail cactus Cactaceae Shrub Coryphantha strobiliformis AZ (SR) Escobaria villardii Sacramento Mountain foxtail cactus Cactaceae Shrub NM (E) Escobaria vivipara spinystar Cactaceae Shrub MN (E) Escobaria vivipara var. arizonica Arizona spinystar Cactaceae Shrub NV (CY) Coryphantha vivipara var. arizonica AZ (SR) Escobaria vivipara var. bisbeeana Bisbee spinystar Cactaceae Shrub AZ () Coryphantha vivipara var. bisbeeana AZ (SR) Escobaria vivipara var. deserti desert spinystar Cactaceae Shrub NV (CY) Coryphantha vivipara var. deserti AZ (SR) Escobaria vivipara var. rosea spinystar Cactaceae Shrub NV (CY) Coryphantha vivipara var. rosea AZ (SR) Escobaria vivipara var. vivipara spinystar Cactaceae Shrub AZ () Coryphantha missouriensis var. marstonii AZ (SR) Eubotrys racemosus swamp doghobble Ericaceae Shrub PA (), TN () Leucothoe racemosa PA (T), TN (T) Eubotrys recurvus redtwig doghobble Ericaceae Shrub KY () Leucothoe recurva KY (E) Eucephalus vialis wayside aster Asteraceae Forb/herb OR () Aster vialis OR (T) Eugenia confusa redberry stopper Myrtaceae Tree, Shrub FL (E) Eugenia rhombea red stopper Myrtaceae Tree, Shrub FL (E) Euonymus americanus bursting-heart Celastraceae Forb/herb, IL (), NY () Subshrub Euonymus americana IL (E), NY (E) Euonymus atropurpureus burningbush Celastraceae Shrub, Tree FL (E) Euonymus obovatus running strawberry bush Celastraceae Shrub, Subshrub, NY (), TN () Vine Euonymus obovata NY (EV), TN (SC) Euonymus occidentalis western burning bush Celastraceae Shrub, Tree WA (S) Eupatorium album white thoroughwort Asteraceae Forb/herb CT (E), IN (E), OH (T), PA (X) Eupatorium album var. subvenosum white thoroughwort Asteraceae Forb/herb NY (T) Eupatorium capillifolium dogfennel Asteraceae Forb/herb NJ (E) Eupatorium hyssopifolium hyssopleaf thoroughwort Asteraceae Forb/herb OH (E) Eupatorium hyssopifolium var. laciniatum hyssopleaf thoroughwort Asteraceae Forb/herb NY (T) Eupatorium leucolepis justiceweed Asteraceae Forb/herb MD (T), PA (X), TN (E) Eupatorium leucolepis var. leucolepis justiceweed Asteraceae Forb/herb NY (E) Eupatorium novae-angliae New England justiceweed Asteraceae Forb/herb MA (E), RI (E) Eupatorium leucolepis var. novae-angliae MA (E), RI (E) Eupatorium perfoliatum var. colpophilum common boneset Asteraceae Forb/herb ME (PX) Eupatorium resinosum pine barren thoroughwort Asteraceae Forb/herb NC (SC, T), NJ (E) Eupatorium rotundifolium roundleaf thoroughwort Asteraceae Forb/herb ME (PX) Eupatorium rotundifolium var. ovatum roundleaf thoroughwort Asteraceae Forb/herb NY (E) Eupatorium pubescens NH (E) Eupatorium rotundifolium var. rotundifolium roundleaf thoroughwort Asteraceae Forb/herb NY (E) Eupatorium semiserratum smallflower thoroughwort Asteraceae Forb/herb KY (E) Eupatorium serotinum lateflowering thoroughwort Asteraceae Forb/herb NY (E) Eupatorium sessilifolium upland boneset Asteraceae Forb/herb MI (T), MN (T), NH (E), VT (E) Euphorbia commutata tinted woodland spurge Euphorbiaceae Forb/herb FL (E), MI (T) Euphorbia ipecacuanhae American ipecac Euphorbiaceae Forb/herb NY (E), PA (E) Euphorbia macropus Huachuca Mountain spurge Euphorbiaceae Forb/herb AZ () Euphorbia plummerae AZ (SR) Euphorbia mercurialina mercury spurge Euphorbiaceae Forb/herb KY (T) Euphorbia pinetorum pineland spurge Euphorbiaceae Forb/herb FL () Poinsettia pinetorum FL (E) Euphorbia purpurea Darlington's glade spurge Euphorbiaceae Forb/herb MD (E), NJ (E), OH (E), PA (E) Euphorbia spathulata warty spurge Euphorbiaceae Forb/herb IL (E) Euphorbia obtusata IN (X), MD (E), PA (E) Euphorbia telephioides telephus spurge Euphorbiaceae Forb/herb Threatened FL (E) Euphrasia hudsoniana Hudson Bay eyebright Scrophulariaceae Forb/herb MI (T) Euphrasia nemorosa common eyebright Scrophulariaceae Forb/herb MI (T) Euphrasia oakesii Oakes' eyebright Scrophulariaceae Forb/herb ME (E), NH (E) Eurybia furcata forked aster Asteraceae Forb/herb AR (), IA (), IL (), IN (), MI (), WI () Aster furcatus AR (T), IA (T), IL (T), IN (R), MI (T), WI (T) Eurybia hemispherica southern prairie aster Asteraceae Forb/herb FL (), KY () Aster hemisphericus FL (E), KY (E) Eurybia macrophylla bigleaf aster Asteraceae Forb/herb IA (), RI () Aster macrophyllus IA (E), RI (SC) Eurybia merita subalpine aster Asteraceae Forb/herb WA () Aster sibiricus var. meritus WA (S) Eurybia radula low rough aster Asteraceae Forb/herb CT (), KY (), MD (), NJ (), NY () Aster radula CT (E), KY (E), MD (E), NJ (E), NY (E) Eurybia saxicastellii rockcastle aster Asteraceae Forb/herb KY (), TN () Aster saxicastellii KY (T), TN (E) Eurybia schreberi Schreber's aster Asteraceae Forb/herb IA (), IN (), ME (), TN () Aster schreberi IA (E), IN (E), ME (PX), TN (SC) Eurybia spectabilis eastern showy aster Asteraceae Forb/herb CT (), MD (), NY (), PA () Aster spectabilis CT (T), MD (E), NY (T), PA (E) Eurybia spinulosa Apalachicola aster Asteraceae Forb/herb FL () Aster spinulosus FL (E) Eurybia surculosa creeping aster Asteraceae Forb/herb OH () Aster surculosus OH (PRX) Euthamia caroliniana slender goldentop Asteraceae Forb/herb ME (), PA () Euthamia tenuifolia ME (T), PA (T) Euthamia gymnospermoides Texas goldentop Asteraceae Forb/herb OH () Euthamia remota OH (T) Eutrochium dubium coastal plain joe pye weed Asteraceae Forb/herb Eupatorium dubium ME (T) Eutrochium fistulosum trumpetweed Asteraceae Forb/herb Eupatorium fistulosum ME (SC), MI (T), NH (E) Eutrochium maculatum spotted joe pye weed Asteraceae Forb/herb Eupatorium maculatum KY (H), MD (E, X) Eutrochium steelei Steele's eupatorium Asteraceae Forb/herb KY (E), TN (SC) Eupatorium steelei KY (E), TN (SC) Evolvulus grisebachii Grisebach's dwarf morning-glory Convolvulaceae Forb/herb FL (E) Evolvulus nuttallianus shaggy dwarf morning-glory Convolvulaceae Subshrub, TN (SC) Forb/herb

Evolvulus sericeus silver dwarf morning-glory Convolvulaceae Forb/herb AR (T) Evolvulus sericeus var. sericeus silver dwarf morning-glory Convolvulaceae Forb/herb GA (E) Exostema caribaeum Caribbean princewood Rubiaceae Tree, Shrub FL (E) Ferocactus cylindraceus var. cylindraceus California barrel cactus Cactaceae Shrub AZ (SR) Ferocactus cylindraceus var. lecontei Leconte's barrel cactus Cactaceae Shrub AZ (SR), NV (CY) Ferocactus eastwoodiae California barrel cactus Cactaceae Shrub AZ () Ferocactus cylindraceus var. eastwoodiae AZ (SR) Ferocactus emoryi Emory's barrel cactus Cactaceae Shrub AZ (SR) Ferocactus wislizeni candy barrelcactus Cactaceae Tree, Shrub AZ (SR) Festuca altaica Altai fescue Poaceae Graminoid MI () Festuca scabrella MI (T) Festuca occidentalis western fescue Poaceae Graminoid WI (T) Festuca paradoxa clustered fescue Poaceae Graminoid IN (E), MD (E, X), PA (E), TN (SC) Festuca rubra ssp. rubra red fescue Poaceae Graminoid ME (), NH () Festuca prolifera ME (E) Festuca rubra var. prolifera NH (E) Festuca saximontana Rocky Mountain fescue Poaceae Graminoid NY (E) Filipendula occidentalis queen of the Rosaceae Forb/herb WA (T) Filipendula rubra queen of the prairie Rosaceae Forb/herb IA (T), IL (E), MD (E), MI (T), NC (E), NJ (E) Fimbristylis annua annual fimbry Cyperaceae Graminoid PA (T) Fimbristylis autumnalis slender fimbry Cyperaceae Graminoid ME (T), VT (E) Fimbristylis castanea marsh fimbry Cyperaceae Graminoid NY (T) Fimbristylis perpusilla Harper's fimbry Cyperaceae Graminoid GA (E), MD (E), NC (T), TN (E), VA (E) Fimbristylis puberula hairy fimbry Cyperaceae Graminoid IN (E), KY (T), MI (PREX), PA (X), TN (T), WI (E) Fimbristylis puberula var. interior hairy fimbry Cyperaceae Graminoid MN (E) Fimbristylis vahlii Vahl's fimbry Cyperaceae Graminoid IL (E) Flaveria macdougalii Mcdougall's yellowtops Asteraceae Forb/herb AZ (SR) Fleischmannia incarnata pink thoroughwort Asteraceae Forb/herb IL (), IN () Eupatorium incarnatum IL (T), IN (T) Floerkea proserpinacoides false mermaidweed Limnanthaceae Forb/herb CT (E), IA (E), MN (T) Forestiera godfreyi Godfrey's swampprivet Oleaceae Shrub FL (E) Forestiera ligustrina upland swampprivet Oleaceae Shrub KY (T) Fothergilla gardenii dwarf witchalder Hamamelidaceae Shrub FL (E), GA (T) Fothergilla major mountain witchalder Hamamelidaceae Shrub TN (T) Fouquieria splendens ocotillo Fouquieriaceae Shrub AZ (SR) Fragaria vesca ssp. americana woodland strawberry Rosaceae Forb/herb IN () Fragaria vesca var. americana IN (X) Frankenia johnstonii Johnston's seaheath Frankeniaceae Subshrub, Shrub Endangered TX (E) caroliniensis American columbo Gentianaceae Forb/herb NY (T), PA (E) Frasera gypsicola Sunnyside frasera Gentianaceae Forb/herb NV (FP) nigra black ash Oleaceae Tree RI (SC) Fraxinus profunda pumpkin ash Oleaceae Tree MI (T), NJ (E), PA (E) Fraxinus quadrangulata blue ash Oleaceae Tree IA (T), WI (T) Fremontodendron californicum California flannelbush Sterculiaceae Tree, Shrub AZ (SR) Fremontodendron decumbens Pine Hill flannelbush Sterculiaceae Shrub CA (R) Fremontodendron mexicanum Mexican flannelbush Sterculiaceae Tree, Shrub Endangered CA (R) Fritillaria atropurpurea spotted fritillary Liliaceae Forb/herb AZ (SR) Fritillaria camschatcensis Kamchatka fritillary Liliaceae Forb/herb WA (S) Fritillaria gentneri Gentner's fritillary Liliaceae Forb/herb Endangered OR (E) Fritillaria grayana Gray's fritillary Liliaceae Forb/herb CA () Fritillaria roderickii CA (E) Fritillaria striata striped abobe lily Liliaceae Forb/herb CA (T) Froelichia floridana plains snakecotton Amaranthaceae Forb/herb OH (E) Fuirena pumila dwarf umbrella-sedge Cyperaceae Graminoid IN (T), NY (R), RI (E), WI (E) Fuirena squarrosa hairy umbrella-sedge Cyperaceae Graminoid MI (T), TN (SC) Galactia regularis eastern milkpea Fabaceae Forb/herb, Vine PA (X) Galactia smallii Small's milkpea Fabaceae Vine, Forb/herb Endangered FL (E) Galactia volubilis downy milkpea Fabaceae Vine, Forb/herb NJ (E), OH (T), PA (X) Galeandra bicarinata hooded orchid Orchidaceae Forb/herb FL () Galeandra beyrichii FL (E) Galearis spectabilis showy orchid Orchidaceae Forb/herb ME (E), MI (T), NH (T), NY (EV), RI (E) Galium angustifolium ssp. borregoense Borrego bedstraw Rubiaceae Forb/herb, CA (R) Subshrub Galium asprellum rough bedstraw Rubiaceae Forb/herb TN (SC) Galium boreale northern bedstraw Rubiaceae Subshrub, MA (E), MD (E) Forb/herb Galium brevipes limestone swamp bedstraw Rubiaceae Forb/herb ME (SC) Galium buxifolium box bedstraw Rubiaceae Subshrub Endangered CA (R) Galium californicum ssp. sierrae El Dorado bedstraw Rubiaceae Forb/herb, Endangered CA (R) Subshrub Galium catalinense ssp. acrispum Santa Clemente Island bedstraw Rubiaceae Subshrub, CA (E) Forb/herb Galium concinnum shining bedstraw Rubiaceae Forb/herb NY (E) Galium hispidulum coastal bedstraw Rubiaceae Forb/herb MD (E), NJ (E) Galium kamtschaticum boreal bedstraw Rubiaceae Forb/herb ME (SC), MI (T), NY (E), WA (S) Galium labradoricum northern bog bedstraw Rubiaceae Forb/herb CT (SC), IA (E), IL (T), MA (T), ME (SC), NH (E), NJ (E), OH (E), PA (E), VT (T) Galium lanceolatum lanceleaf wild licorice Rubiaceae Forb/herb IL (E) Galium obtusum bluntleaf bedstraw Rubiaceae Forb/herb ME (PX) Galium obtusum ssp. obtusum bluntleaf bedstraw Rubiaceae Forb/herb NH (E) Galium palustre common marsh bedstraw Rubiaceae Forb/herb OH (E), TN (SC) Galium pilosum hairy bedstraw Rubiaceae Forb/herb NH (E) Galium trifidum threepetal bedstraw Rubiaceae Vine, Forb/herb NJ (E) Galium virgatum southwestern bedstraw Rubiaceae Forb/herb IL (E) Gamochaeta purpurea spoonleaf purple everlasting Asteraceae Forb/herb MA (E), ME (PX) Gnaphalium purpureum CT (SC), NY (E), RI (H) Garberia heterophylla garberia Asteraceae Shrub FL (T) Gaultheria hispidula creeping snowberry Ericaceae Subshrub, Shrub CT (T), MD (E), NJ (E), OH (PRX), PA (R), RI (T), WA (S) Gaultheria procumbens eastern teaberry Ericaceae Subshrub, Shrub IL (E) Gaura filipes slenderstalk beeblossom Onagraceae Forb/herb IN (T) Gaylussacia baccata black huckleberry Ericaceae Shrub IA (T) Gaylussacia brachycera box huckleberry Ericaceae Subshrub, Shrub MD (E), PA (E) Gaylussacia dumosa dwarf huckleberry Ericaceae Subshrub, Shrub PA (E), TN (T) Gaylussacia dumosa var. bigeloviana CT (T), NH (T), NY (E), RI (SC) evening trumpetflower Loganiaceae Vine, Shrub TN (SC) Gentiana alba plain gentian Gentianaceae Forb/herb IN (R), OH (T), PA (X), WI (T) Gentiana flavida KY (E), MI (E) Gentiana andrewsii closed bottle gentian Gentianaceae Forb/herb MA (T), MD (T), NH (T), NY (EV), RI (H), VT (T) Gentiana austromontana Appalachian gentian Gentianaceae Forb/herb TN (SC) Gentiana catesbaei Elliott's gentian Gentianaceae Forb/herb PA (X) Gentiana clausa bottle gentian Gentianaceae Forb/herb NY (EV) Gentiana decora showy gentian Gentianaceae Forb/herb KY (SC) Gentiana douglasiana swamp gentian Gentianaceae Forb/herb WA (S) Gentiana glauca pale gentian Gentianaceae Forb/herb WA (S) Gentiana linearis narrowleaf gentian Gentianaceae Forb/herb MI (T), NJ (E), NY (EV), TN (T) Gentiana pennelliana wiregrass gentian Gentianaceae Forb/herb FL (E) Gentiana puberulenta downy gentian Gentianaceae Forb/herb IN (T), KY (E), MD (E, X), MI (E), OH (E), TN (E) Gentiana rubricaulis closed gentian Gentianaceae Forb/herb ME (PX) Gentiana saponaria harvestbells Gentianaceae Forb/herb MI (PREX), NY (E), OH (E), PA (E) Gentiana villosa striped gentian Gentianaceae Forb/herb IN (E), MD (E), OH (E), PA (E) Gentianella amarella autumn dwarf gentian Gentianaceae Forb/herb ME (E), VT (T) Gentianella quinquefolia agueweed Gentianaceae Forb/herb MD (E), ME (PX), MI (T), NY (EV), VT (T) Gentianella quinquefolia ssp. quinquefolia agueweed Gentianaceae Forb/herb CT () Gentiana quinquefolia CT (E) Gentianella tenella Dane's dwarf gentian Gentianaceae Forb/herb WA (S) Gentianella wislizeni Chiricahua Mountain dwarf gentian Gentianaceae Forb/herb AZ (SR) Gentianopsis crinita greater fringed gentian Gentianaceae Forb/herb GA (T), MD (E), NC (E, SC), NY (EV), RI (T) Gentiana crinita NH (T) Gentianopsis virgata ssp. virgata lesser fringed gentian Gentianaceae Forb/herb NY (), PA () Gentianopsis procera NY (E), PA (X) Geocarpon minimum tinytim Caryophyllaceae Forb/herb Threatened AR (E), MO (E) Geocaulon lividum false toadflax Santalaceae Forb/herb ME (SC), NH (T), NY (E), WI (E) Geranium bicknellii Bicknell's cranesbill Geraniaceae Forb/herb CT (SC), IL (E), IN (E), OH (E), PA (E), RI (T) Geranium carolinianum var. carolinianum Carolina geranium Geraniaceae Forb/herb NH (E) Geranium carolinianum var. confertiflorum NH (E) Geranium carolinianum var. sphaerospermum Carolina geranium Geraniaceae Forb/herb NY (T) Geranium robertianum Robert geranium Geraniaceae Forb/herb IN (T), MD (E), RI (SC) Geum aleppicum yellow avens Rosaceae Forb/herb MD (E) Geum geniculatum bent avens Rosaceae Forb/herb NC (T), TN (E) Geum laciniatum rough avens Rosaceae Forb/herb RI (H), TN (SC) Geum peckii mountain avens Rosaceae Forb/herb NH (T) Geum radiatum Appalachian avens Rosaceae Forb/herb Endangered NC (E, SC), TN (E) Geum rivale purple avens Rosaceae Forb/herb IN (E), WA (S) Geum rossii var. depressum Ross' avens Rosaceae Forb/herb WA (S) Geum triflorum old man's whiskers Rosaceae Forb/herb MI (T), NY (T) Geum vernum spring avens Rosaceae Forb/herb NY (E) Geum virginianum cream avens Rosaceae Forb/herb NY (E) Gilia tenuiflora ssp. arenaria greater yellowthroat gilia Polemoniaceae Forb/herb Endangered CA (T) Gillenia stipulata American ipecac Rosaceae Forb/herb, MD () Subshrub Porteranthus stipulatus MD (E, X) Gillenia trifoliata Bowman's root Rosaceae Forb/herb, MI (T) Subshrub specularioides common bluecup Campanulaceae Forb/herb WA (S) Glandularia canadensis rose mock vervain Verbenaceae Forb/herb KY (T) Glandularia maritima coastal mock vervain Verbenaceae Forb/herb FL () Verbena maritima FL (E) Glandularia tampensis Tampa mock vervain Verbenaceae Forb/herb FL () Verbena tampensis FL (E) Glaux maritima sea milkwort Primulaceae Forb/herb MD (E, X), MN (E), NJ (E), RI (H) Gleditsia aquatica water locust Fabaceae Tree, Shrub IN (E), KY (SC) Glyceria acutiflora creeping mannagrass Poaceae Graminoid IN (E), KY (T), MD (E), ME (E), MI (PREX), NH (E), OH (E), TN (SC), VT (E) Glyceria arkansana Arkansas mannagrass Poaceae Graminoid IL (E) Glyceria borealis small floating mannagrass Poaceae Graminoid IN (E), NJ (E), OH (PRX), PA (T) Glyceria grandis American mannagrass Poaceae Graminoid IN (X), MD (E), NJ (E), TN (E, PX) Glyceria laxa limp mannagrass Poaceae Graminoid TN (SC) Glyceria nubigena Great Smoky Mountain mannagrass Poaceae Graminoid NC (T), TN (T) Glyceria obtusa Atlantic mannagrass Poaceae Graminoid PA (E) Goodyera oblongifolia western rattlesnake plantain Orchidaceae Forb/herb AZ (SR), ME (E) Goodyera pubescens downy rattlesnake plantain Orchidaceae Forb/herb FL (E), NY (EV) Goodyera repens lesser rattlesnake plantain Orchidaceae Forb/herb AZ (SR), MA (E), MD (E, X), NY (EV), TN (SC) Goodyera repens var. ophioides CT (SC) Goodyera tesselata checkered rattlesnake plantain Orchidaceae Forb/herb MD (E, X), NJ (E), NY (EV), OH (PRX), PA (T) Gossypium hirsutum upland cotton Malvaceae Tree, Subshrub, FL (E) Shrub Govenia floridana tropical govenia Orchidaceae Forb/herb FL () Govenia utriculata FL (E) Grammitis nimbata West Indian dwarf polypody Grammitidaceae Forb/herb NC (E) Graptopetalum bartramii Patagonia Mountain leatherpetal Crassulaceae Forb/herb AZ (SR) Graptopetalum rusbyi San Francisco River leatherpetal Crassulaceae Forb/herb AZ (SR) Gratiola aurea golden hedgehyssop Scrophulariaceae Forb/herb MI (T), PA (E) Gratiola floridana Florida hedgehyssop Scrophulariaceae Forb/herb TN (E) Gratiola heterosepala Boggs Lake hedgehyssop Scrophulariaceae Forb/herb CA (E), OR (T) Gratiola pilosa shaggy hedgehyssop Scrophulariaceae Forb/herb KY (T) Gratiola ramosa branched hedgehyssop Scrophulariaceae Forb/herb MD (E, X) Gratiola virginiana roundfruit hedgehyssop Scrophulariaceae Forb/herb MI (T), RI (SC) Gratiola viscidula Short's hedgehyssop Scrophulariaceae Forb/herb KY (SC), MD (E) Grindelia fraxinopratensis Ash Meadows gumweed Asteraceae Forb/herb Threatened NV (FP) Grusonia clavata club cholla Cactaceae Shrub AZ () Opuntia clavata AZ (SR) Grusonia kunzei devil's cholla Cactaceae Shrub AZ () Opuntia kunzei AZ (SR) Grusonia parishii matted cholla Cactaceae Shrub AZ (), NV () Opuntia emoryi AZ (SR) Opuntia parishii AZ (SR), NV (CY) Grusonia pulchella sagebrush cholla Cactaceae Shrub AZ (), NV () Opuntia pulchella AZ (SR), NV (CY) Guaiacum sanctum holywood Zygophyllaceae Tree, Shrub FL (E) Guillenia lasiophylla California mustard Brassicaceae Forb/herb CA () Caulanthus stenocarpus CA (E) Guzmania monostachia West Indian tufted airplant Bromeliaceae Forb/herb FL (E) Gyminda latifolia West Indian false box Celastraceae Tree, Shrub FL (E) Gymnocarpium appalachianum Appalachian oakfern Dryopteridaceae Forb/herb NC (E), OH (PRX), PA (E) Gymnocarpium dryopteris western oakfern Dryopteridaceae Forb/herb IA (T), IL (E), MD (E), NY (EV), OH (T), RI (T) Gymnocarpium ×heterosporum blackspore oakfern Dryopteridaceae Forb/herb PA () Gymnocarpium heterosporum PA (X) Gymnocarpium jessoense Asian oakfern Dryopteridaceae Forb/herb MI (E) Gymnocarpium robertianum scented oakfern Dryopteridaceae Forb/herb IL (E), MI (T) Gymnocladus dioicus Kentucky coffeetree Fabaceae Tree NY (E) Gymnopogon ambiguus bearded skeletongrass Poaceae Graminoid IN (X), KY (SC), OH (PRX), PA (X) Gymnopogon brevifolius shortleaf skeletongrass Poaceae Graminoid KY (E), MD (E), NJ (E), TN (SC) Habenaria distans hammock bog orchid Orchidaceae Forb/herb FL (E) cinerea gray stickseed Boraginaceae Forb/herb WA (S) Hackelia cronquistii Cronquist's stickseed Boraginaceae Forb/herb OR (T) Hackelia deflexa nodding stickseed Boraginaceae Forb/herb ME (E), OH (PRX) Hackelia deflexa var. americana American stickseed Boraginaceae Forb/herb NH (E), NY (E), VT (T) Hackelia americana IL (E) Hackelia diffusa var. diffusa spreading stickseed Boraginaceae Forb/herb WA (S) Hackelia hispida var. disjuncta rough stickseed Boraginaceae Forb/herb WA (S) Hackelia hispida var. hispida showy stickseed Boraginaceae Forb/herb WA (S) Hackelia venusta lesser showy stickseed Boraginaceae Forb/herb Endangered WA (E) Hackelia virginiana beggarslice Boraginaceae Forb/herb NH (T) Halenia deflexa American spurred gentian Gentianaceae Forb/herb MA (E), NH (E), NY (E) Halesia carolina Carolina silverbell Styracaceae Tree, Shrub IL (E), OH (PRX) Halesia diptera two-wing silverbell Styracaceae Tree, Shrub AR (E) Halesia tetraptera mountain silverbell Styracaceae Tree KY (T) Harperocallis flava Harper's beauty Liliaceae Forb/herb Endangered FL (E) Harrimanella hypnoides mossplant Ericaceae Subshrub, Shrub ME (T) Cassiope hypnoides NH (T) Harrisia eriophora fragrant applecactus Cactaceae Shrub FL (E) Hartwrightia floridana Florida hartwrightia Asteraceae Forb/herb FL (T), GA (T) Hasteola robertiorum hammockherb Asteraceae Forb/herb FL (E) Hasteola suaveolens false Indian plantain Asteraceae Forb/herb MD (E) Cacalia suaveolens CT (E), IA (T), MN (E), NY (E), RI (H) Synosma suaveolens TN (T) Hastingsia bracteosa var. bracteosa largeflower rushlily Liliaceae Forb/herb OR (T) Hedeoma diffusa spreading false pennyroyal Lamiaceae Forb/herb AZ (SR) Hedeoma hispida rough false pennyroyal Lamiaceae Forb/herb KY (T), NY (T), OH (T) Hedeoma pulegioides American false pennyroyal Lamiaceae Forb/herb RI (SC) Hedeoma todsenii Todsen's false pennyroyal Lamiaceae Subshrub, Endangered NM (E) Forb/herb Hedysarum alpinum alpine sweetvetch Fabaceae Forb/herb ME (SC), MI (E) Helenium brevifolium shortleaf sneezeweed Asteraceae Forb/herb NC (E), TN (E) Helenium vernale savannah sneezeweed Asteraceae Forb/herb NC (E) Helenium virginicum Virginia sneezeweed Asteraceae Forb/herb Threatened VA (E) Helianthemum bicknellii hoary frostweed Cistaceae Subshrub, KY (T), MD (E), Forb/herb OH (T), PA (E), TN (E, PX), VT (T) Helianthemum canadense longbranch frostweed Cistaceae Subshrub, KY (E), TN (E, PX) Forb/herb Helianthemum dumosum bushy frostweed Cistaceae Forb/herb CT (SC), MA (SC), NY (T), RI (E) Helianthemum propinquum low frostweed Cistaceae Forb/herb CT (E), RI (SC), TN (SC) Helianthus angustifolius swamp sunflower Asteraceae Forb/herb IL (T), NY (T), PA (X) Helianthus carnosus lakeside sunflower Asteraceae Forb/herb FL (E) Helianthus divaricatus woodland sunflower Asteraceae Forb/herb RI (SC) Helianthus eggertii Eggert's sunflower Asteraceae Forb/herb KY (T), TN (T) Helianthus giganteus giant sunflower Asteraceae Forb/herb IL (E) Helianthus glaucophyllus whiteleaf sunflower Asteraceae Forb/herb TN (T) Helianthus laevigatus smooth sunflower Asteraceae Forb/herb MD (E) Helianthus microcephalus small woodland sunflower Asteraceae Forb/herb MD (E), MI (PREX) Helianthus mollis ashy sunflower Asteraceae Forb/herb MI (T), OH (T) Helianthus niveus ssp. tephrodes Algodones sunflower Asteraceae Subshrub, CA (E) Forb/herb Helianthus occidentalis fewleaf sunflower Asteraceae Forb/herb MD (T) Helianthus paradoxus paradox sunflower Asteraceae Forb/herb Threatened NM (E), TX (T) Helianthus schweinitzii Schweinitz's sunflower Asteraceae Forb/herb Endangered NC (E) Helianthus silphioides rosinweed sunflower Asteraceae Forb/herb KY (E) Helianthus strumosus paleleaf woodland sunflower Asteraceae Forb/herb VT (T) Helianthus verticillatus whorled sunflower Asteraceae Forb/herb TN (E) Heliotropium fruticosum Key West heliotrope Boraginaceae Forb/herb FL (E) Heliotropium tenellum pasture heliotrope Boraginaceae Forb/herb IL (E), IN (T) Helonias bullata swamppink Liliaceae Forb/herb Threatened GA (T), MD (E), NC (SC, T), NJ (E), VA (E) Hepatica nobilis hepatica Ranunculaceae Forb/herb FL (E) Hepatica nobilis var. acuta sharplobe hepatica Ranunculaceae Forb/herb ME (PX) Hepatica acutiloba CT (T) Hepatica nobilis var. obtusa roundlobe hepatica Ranunculaceae Forb/herb RI () Hepatica americana RI (SC) Heracleum maximum common cowparsnip Apiaceae Forb/herb TN (SC) Heracleum lanatum KY (E) Hesperocallis undulata desert lily Liliaceae Forb/herb AZ (SR) Hesperocyparis abramsiana Santa Cruz cypress Cupressaceae Tree Cupressus abramsiana Endangered CA (E) Hesperocyparis arizonica Arizona cypress Cupressaceae Tree Cupressus arizonica NV (CY) Hesperolinon congestum Marin dwarf-flax Linaceae Forb/herb Threatened CA (T) Hesperolinon didymocarpum Lake County dwarf-flax Linaceae Forb/herb CA (E) Hesperostipa comata ssp. comata needle and thread Poaceae Graminoid IN () Stipa comata IN (X) Hesperostipa spartea porcupinegrass Poaceae Graminoid OH () Stipa spartea OH (T) Hesperoyucca whipplei chaparral Agavaceae Forb/herb, Shrub, AZ () Subshrub Yucca whipplei var. whipplei AZ (SR) Heteranthera dubia grassleaf mudplantain Pontederiaceae Forb/herb KY (SC), NH (E) Zosterella dubia ME (T) Heteranthera limosa blue mudplantain Pontederiaceae Forb/herb KY (SC), MN (T), TN (T) Heteranthera multiflora bouquet mudplantain Pontederiaceae Forb/herb PA (E) Heteranthera reniformis kidneyleaf mudplantain Pontederiaceae Forb/herb CT (SC), IL (E), OH (E) Heterotheca subaxillaris camphorweed Asteraceae Forb/herb KY () Heterotheca subaxillaris var. latifolia KY (T) Heterotheca villosa var. villosa hairy false goldenaster Asteraceae Subshrub, IN () Forb/herb Chrysopsis villosa IN (T) Heuchera grossulariifolia var. tenuifolia gooseberryleaf alumroot Saxifragaceae Forb/herb WA (S) Heuchera longiflora longflower alumroot Saxifragaceae Forb/herb OH (PRX) Heuchera longiflora var. aceroides TN (SC) Heuchera villosa hairy alumroot Saxifragaceae Forb/herb MD (E, X), OH (T) Hexalectris nitida Glass Mountain crested coralroot Orchidaceae Forb/herb NM (E) Hexalectris spicata spiked crested coralroot Orchidaceae Forb/herb AZ (SR), FL (E), IL (E), IN (R), MD (E, X), NM (E), OH (T) Hexalectris warnockii Texas crested coralroot Orchidaceae Forb/herb AZ (HS) Hexastylis arifolia littlebrownjug Aristolochiaceae Forb/herb FL (T) Hexastylis contracta mountain heartleaf Aristolochiaceae Forb/herb KY (E), NC (E), TN (SC) Hexastylis heterophylla variableleaf heartleaf Aristolochiaceae Forb/herb KY (SC) Hexastylis naniflora dwarfflower heartleaf Aristolochiaceae Forb/herb Threatened NC (T) Hexastylis shuttleworthii var. harperi largeflower heartleaf Aristolochiaceae Forb/herb GA (U) Hexastylis virginica Virginia heartleaf Aristolochiaceae Forb/herb MD (E), TN (SC) Hibiscus lasiocarpos rosemallow Malvaceae Forb/herb, IN (E) Subshrub Hibiscus poeppigii Poeppig's rosemallow Malvaceae Forb/herb FL (E) Hieracium canadense Canadian hawkweed Asteraceae Forb/herb OH (T) Hieracium greenii Maryland hawkweed Asteraceae Forb/herb PA () Hieracium traillii PA (E) Hieracium gronovii queendevil Asteraceae Forb/herb ME (PX) Hieracium kalmii Kalm's hawkweed Asteraceae Forb/herb NJ (E) Hieracium longipilum hairy hawkweed Asteraceae Forb/herb KY (T), OH (PRX), TN (SC) Hieracium robinsonii Robinson's hawkweed Asteraceae Forb/herb ME (PX), NH (E) Hieracium scabrum rough hawkweed Asteraceae Forb/herb TN (T) Hieracium umbellatum narrowleaf hawkweed Asteraceae Forb/herb NH (E) Hieracium venosum rattlesnakeweed Asteraceae Forb/herb ME (E) Hierochloe odorata sweetgrass Poaceae Graminoid MD (E), NC (E), PA (E) Hippomane mancinella Euphorbiaceae Tree FL (E) Hippuris vulgaris common mare's-tail Hippuridaceae Forb/herb IN (X), ME (SC), NH (T), NY (E), VT (E) Hoffmannseggia tenella slender rushpea Fabaceae Subshrub, Endangered TX (E) Forb/herb Holmgrenanthe petrophila rocklady Scrophulariaceae Forb/herb CA () Maurandya petrophila CA (R) Holocarpha macradenia Santa Cruz tarplant Asteraceae Forb/herb Threatened CA (E) Honckenya peploides seaside sandplant Caryophyllaceae Forb/herb CT (SC), MD (E, X) Honckenya peploides ssp. robusta seaside sandplant Caryophyllaceae Forb/herb NH (E)

Honckenya peploides var. robusta RI (SC) Hordeum pusillum little barley Poaceae Graminoid PA (X) Hottonia inflata American featherfoil Primulaceae Forb/herb CT (SC), IN (T), MD (E), ME (T), NJ (E), NY (T), OH (PRX), PA (X), RI (SC), TN (SC) Houstonia longifolia longleaf summer bluet Rubiaceae Forb/herb CT (E), MA (E), ME (SC) Hedyotis longifolia RI (H) Houstonia purpurea var. calycosa Venus' pride Rubiaceae Forb/herb NY (E) Houstonia purpurea var. montana Venus' pride Rubiaceae Forb/herb NC (E) Hedyotis purpurea var. montana Endangered TN (E) Houstonia purpurea var. purpurea Venus' pride Rubiaceae Forb/herb NY (E) Houstonia serpyllifolia thymeleaf bluet Rubiaceae Forb/herb KY (E) Hedyotis michauxii PA (X) Howellia aquatilis water howellia Campanulaceae Forb/herb Threatened WA (T) Hudsonia ericoides pine barren goldenheather Cistaceae Subshrub, Shrub CT (E), NH (T), RI (SC) Hudsonia montana mountain goldenheather Cistaceae Subshrub, Shrub Threatened NC (E) Hudsonia tomentosa woolly beachheather Cistaceae Subshrub, Shrub CT (T), IA (E), IL (E), IN (T), NH (T), OH (PRX), VT (E) Huperzia appalachiana Appalachian clubmoss Lycopodiaceae Forb/herb, ME (SC), MI (E), Subshrub NY (T), TN (T) Huperzia dichotoma hanging clubmoss Lycopodiaceae Subshrub, FL () Forb/herb Lycopodium dichotomum FL (E) Huperzia lucidula shining clubmoss Lycopodiaceae Subshrub, NY (EV) Forb/herb Huperzia porophila rock clubmoss Lycopodiaceae Subshrub, MD (E, X), MN (T), Forb/herb PA (E) Lycopodium porophilum IA (T) Huperzia selago fir clubmoss Lycopodiaceae Subshrub, MA (E), ME (T), Forb/herb NY (E), PA (X) Huperzia selago var. selago fir clubmoss Lycopodiaceae Subshrub, CT () Forb/herb Lycopodium selago CT (SC) Hybanthus concolor eastern greenviolet Violaceae Forb/herb CT (SC), FL (E), IA (T), NJ (E) wild hydrangea Hydrangeaceae Shrub FL (E), NY (E) Hydrastis canadensis goldenseal Ranunculaceae Forb/herb CT (E), GA (E), MA (E), MD (T), MI (T), MN (E), NC (E, SC), NJ (E), NY (T), PA (V), TN (CE, SC), VT (E) Hydrocotyle americana American marshpennywort Apiaceae Forb/herb IN (E), KY (E), TN (E) Hydrocotyle ranunculoides floating marshpennywort Apiaceae Forb/herb IL (E), NJ (E), NY (E) Hydrocotyle umbellata manyflower marshpennywort Apiaceae Forb/herb CT (E), OH (E), PA (X) Hydrocotyle verticillata whorled marshpennywort Apiaceae Forb/herb CT (SC), MA (T), NY (E), RI (H) Hydrolea ovata ovate false fiddleleaf Hydrophyllaceae Forb/herb KY (E), TN (SC) Hydrolea uniflora oneflower false fiddleleaf Hydrophyllaceae Forb/herb IL (E), KY (SC) Hydrophyllum canadense bluntleaf waterleaf Hydrophyllaceae Forb/herb MA (E), NJ (E), VT (T) Hydrophyllum macrophyllum largeleaf waterleaf Hydrophyllaceae Forb/herb MD (T), PA (E) Hydrophyllum virginianum eastern waterleaf Hydrophyllaceae Forb/herb CT (SC), KY (SC), NH (T), TN (T) Hylotelephium telephioides Allegheny stonecrop Crassulaceae Forb/herb IN (), KY (), NY (), PA () Sedum telephioides IN (T), KY (T), NY (E), PA (R) Hymenocallis coronaria shoals spiderlily Liliaceae Forb/herb GA (E) Hymenocallis godfreyi Godfrey's spiderlily Liliaceae Forb/herb FL (E) Hymenocallis henryae Henry's spiderlily Liliaceae FL (E) Hymenoxys texana prairiedawn Asteraceae Forb/herb Endangered TX (E) Hypelate trifoliata inkwood Sapindaceae Tree, Shrub FL (E) adpressum creeping St. Johnswort Clusiaceae Forb/herb CT (SC), IL (E), IN (E), KY (H), MA (T), MD (E), NJ (E), NY (E), PA (X), RI (T), TN (T)

Hypericum ascyron great St. Johnswort Clusiaceae Forb/herb MA (E), ME (PX), VT (T) Hypericum pyramidatum CT (T), IN (E), MD (E, X), NH (T) northern St. Johnswort Clusiaceae Forb/herb IA (E), OH (T) lesser Canadian St. Johnswort Clusiaceae Forb/herb OH (E) Hypericum crux-andreae St. Peterswort Clusiaceae Subshrub, Shrub KY (T) Hypericum stans PA (X) highlands scrub St. Johnswort Clusiaceae Forb/herb Endangered FL (E) bushy St. Johnswort Clusiaceae Shrub NY (E), PA (T) coppery St. Johnswort Clusiaceae Forb/herb IN (T), MD (E), NY (E), OH (E), PA (X) straggling St. Johnswort Clusiaceae Forb/herb IN (R) Hypericum drummondii nits and lice Clusiaceae Forb/herb MD (E, X), PA (X) Arcadian St. Johnswort Clusiaceae Shrub, Subshrub FL (E) Hypericum ellipticum pale St. Johnswort Clusiaceae Forb/herb OH (T), TN (E) cedarglade St. Johnswort Clusiaceae Subshrub, Shrub IN (X) orangegrass Clusiaceae Forb/herb IA (E) Hypericum graveolens mountain St. Johnswort Clusiaceae Forb/herb TN (E) claspingleaf St. Johnswort Clusiaceae Forb/herb IN (E), MD (E), OH (E), PA (X) ssp. multicaule St. Andrew's cross Clusiaceae Subshrub, Shrub MA (E), NY (E) Kalm's St. Johnswort Clusiaceae Shrub IL (E), OH (T) Hypericum lissophloeus smoothbark St. Johnswort Clusiaceae Subshrub FL (E) large St. Johnswort Clusiaceae Forb/herb NJ (E), PA (T), WA (S) Hypericum mitchellianum Blue Ridge St. Johnswort Clusiaceae Forb/herb TN (T) Hypericum nudiflorum early St. Johnswort Clusiaceae Shrub, Subshrub KY (H) shrubby St. Johnswort Clusiaceae Shrub, Subshrub NJ (E), NY (T) Hypericum pseudomaculatum false spotted St. Johnswort Clusiaceae Forb/herb KY (H) roundseed St. Johnswort Clusiaceae Subshrub, MI (T), WI (T) Forb/herb Hypoxis hirsuta common goldstar Liliaceae Forb/herb ME (PX), NH (T) Ilex amelanchier sarvis holly Aquifoliaceae Tree, Shrub FL (T) Ilex collina longstalk holly Aquifoliaceae Tree, Shrub NC (T), VA (E) Nemopanthus collinus TN (SC) Ilex glabra inkberry Aquifoliaceae Shrub CT (T), ME (T), NY (EV), PA (X) Ilex krugiana tawnyberry holly Aquifoliaceae Tree, Shrub FL (T) Ilex laevigata smooth winterberry Aquifoliaceae Tree, Shrub ME (SC), NY (EV) Ilex montana mountain holly Aquifoliaceae Tree, Shrub MA (E), NJ (E), NY (EV) Ilex opaca American holly Aquifoliaceae Tree, Shrub NY (EV), PA (T) Ilex verticillata common winterberry Aquifoliaceae Tree, Shrub AR (T), IA (E), NY (EV) longisepala longsepal wild hollyhock Malvaceae Forb/herb WA (S) Iliamna rivularis var. rivularis streambank wild hollyhock Malvaceae Subshrub, IL (), IN (), VA () Forb/herb Iliamna corei Endangered VA (E) IL (E), IN (E) Illicium floridanum Florida anisetree Illiciaceae Tree, Shrub GA (E) Illicium parviflorum yellow anisetree Illiciaceae Tree, Shrub FL (E) Impatiens pallida pale touch-me-not Balsaminaceae Forb/herb ME (SC) Indigofera miniata coastal indigo Fabaceae Forb/herb AR () Indigofera miniata var. leptosepala AR (T) Indigofera oxycarpa Asian indigo Fabaceae Forb/herb FL () Indigofera keyensis FL (E) Iodanthus pinnatifidus purplerocket Brassicaceae Forb/herb MN (E), PA (E) Ionactis linariifolius flaxleaf whitetop aster Asteraceae Forb/herb IA () Aster linariifolius IA (T) Ionopsis utricularioides delicate violet orchid Orchidaceae Forb/herb FL (E) Ipomoea microdactyla calcareous morning-glory Convolvulaceae Vine FL (E) Ipomoea pandurata man of the earth Convolvulaceae Vine, Forb/herb MI (T), NY (E) Ipomoea tenuissima rockland morning-glory Convolvulaceae Vine, Forb/herb FL (E) Ipomopsis sancti-spiritus Holy Ghost ipomopsis Polemoniaceae Forb/herb Endangered NM (E) Iresine rhizomatosa Juda's bush Amaranthaceae Forb/herb IL (E), IN (R), MD (E) brevicaulis zigzag iris Iridaceae Forb/herb OH (E), TN (E) dwarf crested iris Iridaceae Forb/herb MD (E), PA (E) Iris fulva copper iris Iridaceae Forb/herb KY (E), TN (T) dwarf lake iris Iridaceae Forb/herb Threatened MI (T), WI (T) Iris prismatica slender blue iris Iridaceae Forb/herb MD (E), ME (T), NH (T), NY (T), PA (E), TN (T) Iris verna dwarf violet iris Iridaceae Forb/herb MD (E), OH (T), PA (E) Iris virginica Virginia iris Iridaceae Forb/herb PA (E) Iris virginica var. shrevei Shreve's iris Iridaceae Forb/herb NY (E) Isoetes acadiensis Acadian quillwort Isoetaceae Graminoid MA (E), ME (T) Isoetes appalachiana Appalachian quillwort Isoetaceae Graminoid FL (E) Isoetes boomii Boom's quillwort Isoetaceae Graminoid FL (E) Isoetes butleri limestone quillwort Isoetaceae Graminoid IL (E), KY (E) Isoetes engelmannii Appalachian quillwort Isoetaceae Graminoid IN (E), MI (E), OH (E), RI (SC), VT (T) Isoetes hyemalis evergreen quillwort Isoetaceae Graminoid FL (E) Isoetes lacustris lake quillwort Isoetaceae Graminoid MA (E), NJ (E), NY (R), TN (E) Isoetes macrospora big-spore quillwort Isoetaceae Graminoid NH (T) Isoetes melanopoda blackfoot quillwort Isoetaceae Graminoid IA (E), IN (E), KY (E), MN (E), NJ (E), TN (E) Isoetes melanospora blackspore quillwort Isoetaceae Graminoid Endangered GA (E) Isoetes nuttallii Nuttall's quillwort Isoetaceae Graminoid WA (S) Isoetes piedmontana Peidmont quillwort Isoetaceae Graminoid NC (T) Isoetes prototypus spike quillwort Isoetaceae Graminoid ME (T) Isoetes riparia shore quillwort Isoetaceae Graminoid ME (PX), NH (T), NY (E), RI (SC) Isoetes tegetiformans Merlin's grass Isoetaceae Graminoid Endangered GA (E) Isoetes tenella spiny-spore quillwort Isoetaceae Graminoid OH (), RI () Isoetes echinospora OH (PRX), RI (SC) Isoetes tuckermanii Tuckerman's quillwort Isoetaceae Graminoid NJ (E) Isotria medeoloides small whorled pogonia Orchidaceae Forb/herb Threatened CT (E), GA (T), IL (E), MA (E), MD (E, X), ME (E), MI (E), MO (E), NC (E), NH (E), NJ (E), NY (E), OH (E), PA (E), RI (E), TN (E), VA (E), VT (E) Isotria verticillata large whorled pogonia Orchidaceae Forb/herb FL (E), IL (E), ME (PX), MI (T), NH (E), NY (EV), VT (T) Itea virginica Virginia sweetspire Grossulariaceae Shrub IN (E), PA (X) Iva frutescens Jesuit's bark Asteraceae Subshrub, ME (E) Forb/herb Iva frutescens ssp. oraria Jesuit's bark Asteraceae Subshrub, NH (T) Forb/herb Ivesia callida Tahquitz mousetail Rosaceae Forb/herb CA (R) Ivesia kingii King's mousetail Rosaceae Forb/herb NV () Ivesia kingii var. eremica Threatened NV (FP) Ivesia rhypara var. rhypara grimy mousetail Rosaceae Forb/herb OR (E) Jacquemontia curtissii pineland clustervine Convolvulaceae Vine, Forb/herb FL (T) Jacquemontia havanensis Havana clustervine Convolvulaceae Vine FL (E) Jacquemontia pentanthos skyblue clustervine Convolvulaceae Vine, Forb/herb FL (E) Jacquemontia reclinata beach clustervine Convolvulaceae Vine, Forb/herb Endangered FL (E) Jacquinia keyensis joewood Theophrastaceae Tree, Shrub FL (T) Jeffersonia diphylla twinleaf Berberidaceae Forb/herb GA (E), IA (T), NJ (E), NY (T) cinerea butternut Juglandaceae Tree KY (SC), NY (EV), TN (T) Juncus alpinoarticulatus northern green rush Juncaceae Graminoid ME (T) Juncus alpinoarticulatus ssp. nodulosus northern green rush Juncaceae Graminoid IL (), PA () Juncus alpinus IL (E), PA (T) Juncus ambiguus seasice rush Juncaceae Graminoid NY (E) Juncus arcticus ssp. littoralis mountain rush Juncaceae Graminoid IN (), MD (), PA () Juncus balticus MD (E, X), PA (T) Juncus balticus var. littoralis IN (R) Juncus articulatus jointleaf rush Juncaceae Graminoid IN (E), KY (SC) Juncus biflorus bog rush Juncaceae Graminoid PA (T) Juncus marginatus var. biflorus NY (E) Juncus brachycarpus whiteroot rush Juncaceae Graminoid MI (T), NJ (E), NY (E), PA (E) Juncus brachycephalus smallhead rush Juncaceae Graminoid MD (E, X), PA (T), TN (SC) Juncus caesariensis New Jersey rush Juncaceae Graminoid MD (E), NC (E), NJ (E) Juncus coriaceus leathery rush Juncaceae Graminoid NJ (E) Juncus debilis weak rush Juncaceae Graminoid CT (SC), MA (E), NY (E), RI (T) Juncus dichotomus forked rush Juncaceae Graminoid PA (E) Juncus platyphyllus OH (E) Juncus diffusissimus slimpod rush Juncaceae Graminoid OH (E) Juncus dudleyi Dudley's rush Juncaceae Graminoid ME (SC) Juncus elliottii Elliott's rush Juncaceae Graminoid KY (H), NJ (E) Juncus ensifolius swordleaf rush Juncaceae Graminoid NY (E) Juncus filiformis thread rush Juncaceae Graminoid MA (E), PA (R) Juncus filipendulus ringseed rush Juncaceae Graminoid KY (T) Juncus greenei Greene's rush Juncaceae Graminoid OH (E), PA (X), VT (E) Juncus gymnocarpus rush Juncaceae Graminoid FL (E), PA (R), TN (SC) Juncus hemiendytus var. hemiendytus Herman's dwarf rush Juncaceae Graminoid WA (S) Juncus interior inland rush Juncaceae Graminoid OH (E) Juncus kelloggii Kellogg's dwarf rush Juncaceae Graminoid WA (T) Juncus longii Long's rush Juncaceae Graminoid MD (E) Juncus megacephalus bighead rush Juncaceae Graminoid MD (E, X) Juncus militaris bayonet rush Juncaceae Graminoid IN (X), MD (E, X), MI (T), PA (E), VT (E) Juncus pelocarpus brownfruit rush Juncaceae Graminoid IN (T), MD (E) Juncus scirpoides needlepod rush Juncaceae Graminoid IN (T), MI (T), NY (E), PA (E) Juncus secundus lopsided rush Juncaceae Graminoid IN (E), ME (SC), NH (E), OH (T), VT (E) Juncus stygius moor rush Juncaceae Graminoid ME (SC), MI (T), WI (E) Juncus stygius ssp. americanus moor rush Juncaceae Graminoid NY (E) Juncus subcaudatus woodland rush Juncaceae Graminoid NY (E) Juncus subtilis greater creeping rush Juncaceae Graminoid ME (T) Juncus tiehmii Nevada rush Juncaceae Graminoid WA (T) Juncus torreyi Torrey's rush Juncaceae Graminoid MD (E), ME (PX), NJ (E), PA (E), VT (E) Juncus trifidus highland rush Juncaceae Graminoid MD (E), NY (T), TN (E, PX) Juncus trifidus ssp. carolinianus NC (E) Juncus vaseyi Vasey's rush Juncaceae Graminoid IL (E), ME (E), MI (T) Juniperus californica California juniper Cupressaceae Tree, Shrub NV (CY) Juniperus communis common juniper Cupressaceae Tree, Shrub IL (T), IN (R), MD (E, X), OH (E) Juniperus communis var. depressa common juniper Cupressaceae Tree, Shrub KY (T)

Juniperus grandis western juniper Cupressaceae Tree Juniperus occidentalis var. australis NV (CY) Juniperus horizontalis creeping juniper Cupressaceae Subshrub IA (T), IL (E), NH (E), NY (E), VT (T) Juniperus occidentalis western juniper Cupressaceae Tree Juniperus occidentalis var. occidentalis NV (CY) Juniperus osteosperma Utah juniper Cupressaceae Tree NV (CY) Juniperus scopulorum Rocky Mountain juniper Cupressaceae Tree, Shrub NV (CY) Justicia americana American water-willow Acanthaceae Forb/herb IA (E), MI (T) Justicia cooleyi Cooley's water-willow Acanthaceae Forb/herb Endangered FL (E) Justicia crassifolia thickleaf water-willow Acanthaceae Forb/herb FL (E) Justicia ovata looseflower water-willow Acanthaceae Forb/herb IL (E) Kalmia angustifolia sheep laurel Ericaceae Shrub NY (EV) Kalmia carolina Carolina laurel Ericaceae Shrub TN () Kalmia angustifolia var. carolina TN (E, PX) Kalmia cuneata whitewicky Ericaceae Shrub NC (E, SC) mountain laurel Ericaceae Tree, Shrub FL (T), ME (SC), NY (EV) Kalmia polifolia bog laurel Ericaceae Shrub NJ (E), NY (EV), RI (T) Koanophyllon villosum thoroughwort Asteraceae Subshrub, Shrub FL () Eupatorium villosum FL (E) Koeleria macrantha prairie Junegrass Poaceae Graminoid KY (E), OH (E) Koeleria cristata PA (X) Kosteletzkya depressa white fenrose Malvaceae Forb/herb FL (E) Krigia biflora twoflower dwarfdandelion Asteraceae Forb/herb CT (SC) Krigia caespitosa weedy dwarfdandelion Asteraceae Forb/herb IN () Krigia oppositifolia IN (T) Krigia dandelion potato dwarfdandelion Asteraceae Forb/herb MD (E), NJ (E), OH (T) Krigia montana mountain dwarfdandelion Asteraceae Forb/herb TN (T) Krigia occidentalis western dwarfdandelion Asteraceae Forb/herb KY (E) Krigia virginica Virginia dwarfdandelion Asteraceae Forb/herb IA (E), ME (PX), OH (T) Kumlienia cooleyae Cooley's false buttercup Ranunculaceae Forb/herb WA () Ranunculus cooleyae WA (S) Kyllinga pumila low spikesedge Cyperaceae Graminoid MD (E) Cyperus tenuifolius NJ (E) Lachnanthes caroliana Carolina redroot Haemodoraceae Forb/herb CT (E), MA (SC), MD (E), NY (E), RI (T), TN (E) Lachnocaulon anceps whitehead bogbutton Eriocaulaceae Forb/herb TN (E) Lachnocaulon digynum pineland bogbutton Eriocaulaceae Forb/herb FL (T)

Lactuca floridana woodland lettuce Asteraceae Forb/herb MI (T), NY (E) Lactuca hirsuta hairy lettuce Asteraceae Forb/herb IL (T), MD (E, X), NY (E), OH (E), VT (T) Lactuca ludoviciana biannual lettuce Asteraceae Forb/herb IN (X) Lactuca tatarica var. pulchella blue lettuce Asteraceae Forb/herb MI () Lactuca pulchella MI (T) Lantana canescens hammock shrubverbena Verbenaceae Shrub FL (E) Lantana depressa depressed shrubverbena Verbenaceae Shrub FL (E) Larix laricina tamarack Pinaceae Tree IL (T), MD (E), RI (T) Lasthenia burkei Burke's baeria Asteraceae Forb/herb Endangered CA (E) Lathyrus holochlorus thinleaf pea Fabaceae Vine, Forb/herb WA (T) Lathyrus japonicus beach pea Fabaceae Vine, Forb/herb OH (T), PA (T) Lathyrus japonicus var. maritimus beach pea Fabaceae Vine, Forb/herb IL (), IN (), VT () Lathyrus japonicus var. glaber IL (E) Lathyrus maritimus VT (T) Lathyrus maritimus var. glaber IN (E) Lathyrus ochroleucus cream pea Fabaceae Vine, Forb/herb IL (T), IN (E), NJ (E), OH (T), PA (T) Lathyrus palustris marsh pea Fabaceae Vine, Forb/herb KY (T), MD (E, X), PA (E), TN (SC), VT (T) Lathyrus torreyi Torrey's pea Fabaceae Vine, Forb/herb WA (T) Lathyrus venosus veiny pea Fabaceae Vine, Forb/herb IN (T), KY (SC), NJ (E), NY (E), OH (E) Layia carnosa beach tidytips Asteraceae Forb/herb Endangered CA (E) Leavenworthia exigua var. exigua Tennessee gladecress Brassicaceae Forb/herb GA (T), TN (SC) Leavenworthia exigua var. laciniata Tennessee gladecress Brassicaceae Forb/herb KY (T) Leavenworthia exigua var. lutea Tennessee gladecress Brassicaceae Forb/herb TN (E, PX) Leavenworthia torulosa necklace gladecress Brassicaceae Forb/herb KY (T) Leavenworthia uniflora Michaux's gladecress Brassicaceae Forb/herb IN (E), OH (T) Lechea cernua nodding pinweed Cistaceae Forb/herb FL (T) Lechea divaricata drysand pinweed Cistaceae Subshrub, FL (E) Forb/herb Lechea intermedia largepod pinweed Cistaceae Forb/herb IA (T), IL (T), OH (T) Lechea lakelae Lakela's pinweed Cistaceae Forb/herb FL (E) Lechea minor thymeleaf pinweed Cistaceae Forb/herb OH (T) Lechea mucronata hairy pinweed Cistaceae Forb/herb VT (E) Lechea villosa IA (T) Lechea pulchella Leggett's pinweed Cistaceae Forb/herb MI (T), OH (T), TN (E) Lechea pulchella var. moniliformis Leggett's pinweed Cistaceae Forb/herb MA (E), NY (E) Lechea racemulosa Illinois pinweed Cistaceae Forb/herb IN (E), NY (R) Lechea stricta prairie pinweed Cistaceae Forb/herb IN (X) Lechea tenuifolia narrowleaf pinweed Cistaceae Forb/herb MD (E, X), ME (PX), MN (E), NH (E), NJ (E), NY (T), OH (T) Ledum groenlandicum bog Labrador tea Ericaceae Shrub CT (T), OH (E), PA (R) Leersia hexandra southern cutgrass Poaceae Graminoid MD (E) Leersia lenticularis catchfly grass Poaceae Graminoid MD (E), OH (E) Leiophyllum buxifolium sandmyrtle Ericaceae Subshrub, Shrub KY (H), PA (X) Leitneria floridana corkwood Leitneriaceae Tree, Shrub FL (T) Lemna minuta least duckweed Lemnaceae Forb/herb IN () Lemna minima IN (E) Lemna obscura little duckweed Lemnaceae Forb/herb PA (X) Lemna perpusilla minute duckweed Lemnaceae Forb/herb IN (X), NJ (E), NY (E) Lemna trisulca star duckweed Lemnaceae Forb/herb MD (E) Lemna valdiviana valdivia duckweed Lemnaceae Forb/herb IN (X), MI (PREX), NH (E), NJ (E), NY (E), PA (X) Lepanthopsis melanantha tiny orchid Orchidaceae Forb/herb FL (E) Lepidium davisii Davis' pepperweed Brassicaceae Forb/herb OR (T) Lepidium oxycarpum forked pepperweed Brassicaceae Forb/herb WA (S) Lepidospartum burgessii Burgess' broomsage Asteraceae Shrub NM (E) Leptochloa fusca ssp. fascicularis bearded sprangletop Poaceae Graminoid MA (T) Diplachne maritima CT (E), NY (E) Leptochloa fascicularis var. maritima RI (H) Leptochloa panicoides Amazon sprangletop Poaceae Graminoid IN (E) Leptosiphon bolanderi Bolander's linanthus Polemoniaceae Forb/herb WA () Linanthus bolanderi WA (S) Lepuropetalon spathulatum petiteplant Saxifragaceae Subshrub, Shrub, FL (E) Forb/herb Lespedeza angustifolia narrowleaf lespedeza Fabaceae Forb/herb NY (R), PA (E), TN (T) Lespedeza capitata roundhead lespedeza Fabaceae Forb/herb KY (SC) Lespedeza hirta hairy lespedeza Fabaceae Forb/herb ME (PX), VT (T) Lespedeza leptostachya prairie lespedeza Fabaceae Forb/herb Threatened IA (T), IL (E), MN (T), WI (E) Lespedeza ×nuttallii lespedeza Fabaceae Forb/herb ME (PX) Lespedeza procumbens trailing lespedeza Fabaceae Forb/herb MI (PREX), NH (E) Lespedeza repens creeping lespedeza Fabaceae Forb/herb CT (SC), NY (R) Lespedeza stuevei tall lespedeza Fabaceae Forb/herb IN (X), KY (SC), NY (T), PA (X) Lespedeza violacea violet lespedeza Fabaceae Forb/herb NY (R), VT (T) Lespedeza virginica slender lespedeza Fabaceae Forb/herb NH (T), WI (T) Lesquerella densipila Duck River bladderpod Brassicaceae Forb/herb TN (T) Lesquerella filiformis limestoneglade bladderpod Brassicaceae Forb/herb Threatened MO (E) Lesquerella globosa globe bladderpod Brassicaceae Forb/herb IN (E), KY (T), TN (E) Lesquerella lescurii Lescur's bladderpod Brassicaceae Forb/herb KY (SC) Lesquerella ludoviciana foothill bladderpod Brassicaceae Forb/herb IL (E), MN (E), WI (T) Lesquerella pallida white bladderpod Brassicaceae Forb/herb Endangered TX (E) Lesquerella perforata Spring Creek bladderpod Brassicaceae Forb/herb Endangered TN (E) Lesquerella stonensis Stone River bladderpod Brassicaceae Forb/herb TN (E) Lesquerella thamnophila Zapata bladderpod Brassicaceae Forb/herb Endangered TX (E) Lesquerella tuplashensis White Bluffs bladderpod Brassicaceae Forb/herb WA (E) Lessingia germanorum San Francisco lessingia Asteraceae Forb/herb Endangered CA (E) Leucospora multifida narrowleaf paleseed Scrophulariaceae Forb/herb IA (E), NY (E) Leucothrinax morrisii Key thatch palm Arecaceae Shrub, Tree FL (E) Lewisia congdonii Congdon's lewisia Portulacaceae Forb/herb CA (R) Leymus mollis American dunegrass Poaceae Graminoid MA (E) Liatris cylindracea blazing star Asteraceae Forb/herb KY (T), NY (E), OH (T), TN (T) Liatris gholsonii Gholson's blazing star Asteraceae Forb/herb FL (E) Liatris helleri Heller's blazing star Asteraceae Forb/herb Threatened NC (SC, T) Liatris ohlingerae Florida blazing star Asteraceae Forb/herb Endangered FL (E) Liatris provincialis Godfrey's blazing star Asteraceae Forb/herb FL (E) Liatris punctata dotted blazing star Asteraceae Forb/herb MI (PREX) Liatris punctata var. punctata dotted blazing star Asteraceae Forb/herb WI (E) Liatris pycnostachya prairie blazing star Asteraceae Forb/herb IN (T) Liatris scariosa devil's bite Asteraceae Forb/herb ME (T) Liatris scariosa var. nieuwlandii Nieuwland's blazing star Asteraceae Forb/herb IL (T) Liatris scariosa var. novae-angliae New England blazing star Asteraceae Forb/herb CT (SC), MA (SC), NJ (E), RI (E) Liatris borealis NH (E), NY (T) Liatris squarrosa scaly blazing star Asteraceae Forb/herb MD (E), MI (PREX) Liatris turgida turgid blazing star Asteraceae Forb/herb MD (E, X) Licaria triandra pepperleaf sweetwood Lauraceae Tree FL (E) Ligusticum canadense Canadian licorice-root Apiaceae Forb/herb IN (E), MD (E, X), OH (PRX), PA (E) Ligusticum scoticum Scottish licorice-root Apiaceae Forb/herb CT (E), NY (E), RI (SC) Lilaeopsis carolinensis Carolina grasswort Apiaceae Forb/herb NC (T) Lilaeopsis chinensis eastern grasswort Apiaceae Forb/herb CT (SC), ME (T), NH (T), NY (T), RI (H) Lilaeopsis masonii mudflat quillplant Apiaceae Forb/herb CA (R) Lilaeopsis schaffneriana var. recurva Schaffner's grasswort Apiaceae Forb/herb Endangered AZ (HS) canadense Canada lily Liliaceae Forb/herb IN (R), NY (EV), RI (T), TN (T) pine lily Liliaceae Forb/herb FL (T) Lilium grayi Gray's lily Liliaceae Forb/herb NC (SC, T), TN (E) panhandle lily Liliaceae Forb/herb FL (E), NC (T) Carolina lily Liliaceae Forb/herb FL (E) Lilium michiganense lily Liliaceae Forb/herb NY (E), TN (T) Lilium occidentale western lily Liliaceae Forb/herb Endangered CA (E), OR (E) Lilium pardalinum ssp. pitkinense Pitkin Marsh lily Liliaceae Forb/herb Endangered Lilium pitkinense CA (E) Lilium parryi lemon lily Liliaceae Forb/herb AZ (SR) Lilium philadelphicum wood lily Liliaceae Forb/herb KY (T), MD (E, X), NM (E), NY (EV), OH (T), RI (SC), TN (E) Lilium philadelphicum var. andinum wood lily Liliaceae Forb/herb NM (E) Lilium umbellatum AZ (SR) turk's-cap lily Liliaceae Forb/herb FL (E), KY (T), NH (E), NY (EV) Limnanthes bakeri Baker's meadowfoam Limnanthaceae Forb/herb CA (R) Limnanthes douglasii ssp. sulphurea Douglas' meadowfoam Limnanthaceae Forb/herb CA (E)

Limnanthes floccosa ssp. californica California meadowfoam Limnanthaceae Forb/herb Endangered CA (E) Limnanthes gracilis ssp. parishii Parish's slender meadowfoam Limnanthaceae Forb/herb CA (E) Limnanthes pumila woolly meadowfoam Limnanthaceae Forb/herb OR (T) Limnanthes floccosa ssp. pumila OR (T) Limnanthes pumila ssp. grandiflora woolly meadowfoam Limnanthaceae Forb/herb Endangered OR (E) Limnanthes floccosa ssp. grandiflora Endangered OR (E) Limnanthes vinculans Sebastopol meadowfoam Limnanthaceae Forb/herb Endangered CA (E) Limnobium spongia American spongeplant Hydrocharitaceae Forb/herb KY (T), MD (E) Limonium carolinianum lavender thrift Plumbaginaceae Forb/herb NY (EV) Limosella australis Welsh mudwort Scrophulariaceae Forb/herb MD (E), ME (SC), NH (E), NY (R), PA (X) Limosella subulata CT (SC), NJ (E), RI (SC) Lindera benzoin northern spicebush Lauraceae Tree, Shrub ME (SC) Lindera melissifolia southern spicebush Lauraceae Tree, Shrub Endangered AR (E), FL (E), GA (E), MO (E), NC (E) Lindera subcoriacea bog spicebush Lauraceae Tree, Shrub FL (E), NC (E) Lindernia dubia var. anagallidea yellowseed false pimpernel Scrophulariaceae Forb/herb ME (PX) Lindernia anagallidea NH (E) Lindernia monticola piedmont false pimpernel Scrophulariaceae Forb/herb GA () Lindernia saxicola GA (E) Linnaea borealis twinflower Caprifoliaceae Forb/herb, IA (T), IN (X), Subshrub MD (E, X), NJ (E), OH (PRX), PA (T), RI (H), TN (E, PX) Linnaea borealis ssp. americana twinflower Caprifoliaceae Forb/herb, CT () Subshrub Linnaea borealis var. americana CT (SC) Linum arenicola sand flax Linaceae Forb/herb FL (E) Linum carteri Carter's flax Linaceae Forb/herb FL (E) Linum floridanum Florida yellow flax Linaceae Forb/herb MD (E, X) Linum intercursum sandplain flax Linaceae Forb/herb CT (SC), IN (E), MA (SC), MD (T), NJ (E), NY (T), PA (E), RI (E) Linum macrocarpum Spring Hill flax Linaceae Forb/herb FL (E) Linum medium var. medium stiff yellow flax Linaceae Forb/herb NY (E) Linum medium var. texanum stiff yellow flax Linaceae Forb/herb MA (T), NY (T), RI (SC) Linum striatum ridged yellow flax Linaceae Forb/herb IN (T), NY (R) Linum sulcatum grooved flax Linaceae Forb/herb CT (SC), IN (R), MD (E), NJ (E), NY (T), PA (E), RI (H) Linum virginianum woodland flax Linaceae Forb/herb MI (T) Linum westii West's flax Linaceae Forb/herb FL (E) Liparis elata pantropical widelip orchid Orchidaceae Forb/herb FL () Liparis nervosa FL (E) Liparis liliifolia brown widelip orchid Orchidaceae Forb/herb CT (E), MA (T), NY (E), RI (E), VT (T) Liparis loeselii yellow widelip orchid Orchidaceae Forb/herb AR (T), KY (T), NH (T), NY (EV), RI (T), TN (E), WA (E) Lipocarpha aristulata awned halfchaff sedge Cyperaceae Graminoid WA (S) Lipocarpha drummondii Drummond's halfchaff sedge Cyperaceae Graminoid OH (E) Hemicarpha drummondii IN (X) Lipocarpha micrantha smallflower halfchaff sedge Cyperaceae Graminoid MA (T), MD (E), ME (T), NY (E), OH (T), RI (T) Hemicarpha micrantha CT (E), NJ (E), PA (E) sweetgum Hamamelidaceae Tree CT (SC) Listera auriculata auricled twayblade Orchidaceae Forb/herb ME (T), MN (E), NH (E), NY (E), VT (E), WI (E) Listera australis southern twayblade Orchidaceae Forb/herb FL (T), KY (E), NY (E), PA (E), TN (E), VT (E)

Listera borealis northern twayblade Orchidaceae Forb/herb WA (S) Listera convallarioides broadlipped twayblade Orchidaceae Forb/herb AZ (SR), NH (T), NY (E), WI (T) Listera cordata heartleaf twayblade Orchidaceae Forb/herb MA (E), MD (E, X), NH (T), NJ (E), NY (EV), OH (PRX), PA (E), RI (H) Listera smallii kidneyleaf twayblade Orchidaceae Forb/herb KY (T), MD (E), NJ (E), PA (E), TN (SC) Lithophragma maximum San Clemente Island woodland-star Saxifragaceae Forb/herb Endangered CA (E) Lithospermum caroliniense Carolina puccoon Boraginaceae Forb/herb OH (T), PA (E) Lithospermum caroliniense var. croceum Carolina puccoon Boraginaceae Forb/herb NY () Lithospermum caroliniense ssp. croceum NY (E) Lithospermum incisum narrowleaf stoneseed Boraginaceae Forb/herb IN (E), MI (PREX) Lithospermum latifolium American stoneseed Boraginaceae Forb/herb MD (E), PA (E) Litsea aestivalis pondspice Lauraceae Shrub FL (E), GA (T), MD (E) Littorella uniflora American shoreweed Plantaginaceae Forb/herb ME (SC), NY (E) Lobelia amoena southern lobelia Campanulaceae Forb/herb TN (T) Lobelia appendiculata var. gattingeri Gattinger's lobelia Campanulaceae Forb/herb KY (E) Lobelia boykinii Boykin's lobelia Campanulaceae Forb/herb FL (E), NJ (E) Lobelia canbyi Canby's lobelia Campanulaceae Forb/herb MD (E), TN (T) Lobelia cardinalis cardinalflower Campanulaceae Forb/herb FL (T), NY (EV) Lobelia cardinalis ssp. graminea AZ (SR) Lobelia dortmanna Dortmann's cardinalflower Campanulaceae Forb/herb NJ (E), NY (EV), PA (T), RI (SC), WA (T) Lobelia fenestralis fringeleaf lobelia Campanulaceae Forb/herb AZ (SR) Lobelia glandulosa glade lobelia Campanulaceae Forb/herb MD (E, X) Lobelia kalmii Ontario lobelia Campanulaceae Forb/herb NH (T), PA (E), WA (E) Lobelia laxiflora var. angustifolia Sierra Madre lobelia Campanulaceae Subshrub, AZ (SR) Forb/herb Lobelia nuttallii Nuttall's lobelia Campanulaceae Forb/herb KY (T), NY (R), PA (X) Lobelia puberula downy lobelia Campanulaceae Forb/herb PA (E) Lobelia siphilitica great blue lobelia Campanulaceae Forb/herb MA (E), ME (PX), NY (EV) Loeflingia squarrosa spreading pygmyleaf Caryophyllaceae Forb/herb WA (T) Loiseleuria procumbens alpine Ericaceae Subshrub, Shrub ME (T), NH (T), NY (E), WA (S) Lomariopsis kunzeana hollyleaf fringedfern Dryopteridaceae Vine, Forb/herb FL (E) bradshawii Bradshaw's desertparsley Apiaceae Forb/herb Endangered OR (E), WA (E) Lomatium cookii agate desertparsley Apiaceae Forb/herb Endangered OR (E) Lomatium cusickii Cusick's biscuitroot Apiaceae Forb/herb WA (PX) Lomatium erythrocarpum redfruit desertparsley Apiaceae Forb/herb OR (E) Lomatium foeniculaceum desert biscuitroot Apiaceae Forb/herb IA (E) Greenman's biscuitroot Apiaceae Forb/herb OR (T) Lomatium laevigatum Slickrock biscuitroot Apiaceae Subshrub, WA (S) Forb/herb Lomatium orientale Northern biscuitroot Apiaceae Forb/herb IA (T) Lomatium rollinsii Rollins' biscuitroot Apiaceae Forb/herb WA (T) Lomatium serpentinum sweetscented biscuitroot Apiaceae Subshrub, WA (S) Forb/herb Lomatium suksdorfii Suksdorf's desertparsley Apiaceae Subshrub, WA (S) Forb/herb Lomatium tuberosum Hoover's desertparsley Apiaceae Forb/herb WA (T) Lomatogonium rotatum marsh felwort Gentianaceae Forb/herb ME (T) Lonicera caerulea sweetberry honeysuckle Caprifoliaceae Shrub RI (SC) Lonicera canadensis American fly honeysuckle Caprifoliaceae Shrub IN (X), MD (E), NJ (E), TN (SC) Lonicera dioica limber honeysuckle Caprifoliaceae Vine ME (E), RI (SC), TN (SC) Lonicera dioica var. glaucescens IL (E) Lonicera dioica var. orientalis KY (E) Lonicera flava yellow honeysuckle Caprifoliaceae Vine, Shrub IL (E), OH (PRX), TN (SC) Lonicera hirsuta hairy honeysuckle Caprifoliaceae Vine MA (E), PA (E) Lonicera involucrata twinberry honeysuckle Caprifoliaceae Shrub MI (T), WI (E) Lonicera oblongifolia swamp fly honeysuckle Caprifoliaceae Shrub ME (SC), OH (PRX), PA (E) Lonicera reticulata grape honeysuckle Caprifoliaceae Vine, Shrub KY (E) Lonicera prolifera TN (E, PX) Lonicera sempervirens trumpet honeysuckle Caprifoliaceae Vine ME (E) Lonicera villosa mountain fly honeysuckle Caprifoliaceae Shrub OH (PRX), PA (E) Lophiola aurea goldencrest Liliaceae Forb/herb NC (E) Lotus argophyllus var. adsurgens Santa Cruz Island silverhosackia Fabaceae Forb/herb CA () Lotus argophyllus ssp. adsurgens CA (E) Lotus argophyllus var. niveus Santa Cruz Island silverhosackia Fabaceae Subshrub, CA (E) Forb/herb Lotus dendroideus var. traskiae Trask's island broom Fabaceae Subshrub Endangered CA (E) Ludwigia decurrens wingleaf primrose-willow Onagraceae Forb/herb IN (R), PA (E) Ludwigia glandulosa cylindricfruit primrose-willow Onagraceae Forb/herb IN (T), MD (E) Ludwigia hirtella spindleroot Onagraceae Forb/herb KY (E), MD (E) Ludwigia polycarpa manyfruit primrose-willow Onagraceae Forb/herb CT (SC), MA (E), PA (E), VT (E) Ludwigia sphaerocarpa globefruit primrose-willow Onagraceae Forb/herb CT (E), IN (E), MA (E), MI (T), NY (T), PA (X), RI (E), TN (T) Lupinus citrinus var. deflexus orangeflower lupine Fabaceae Forb/herb CA (T) Lupinus luteolus pale yellow lupine Fabaceae Forb/herb CA () Lupinus milo-bakeri CA (T) Lupinus nipomensis Nipomo Mesa lupine Fabaceae Forb/herb Endangered CA (E) Lupinus oreganus var. kincaidii Kincaid's lupine Fabaceae Forb/herb Threatened Lupinus sulphureus ssp. kincaidii OR (T) Lupinus sulphureus var. kincaidii WA (E) Lupinus padre-crowleyi Dedecker lupine Fabaceae Forb/herb CA (R) Lupinus perennis sundial lupine Fabaceae Forb/herb IA (T), MD (T), ME (PX), NH (T), PA (R), RI (SC), VT (E) Lupinus sabinianus Sabin's lupine Fabaceae Forb/herb WA () Lupinus sabinei WA (E) Lupinus tidestromii Tidestrom's lupine Fabaceae Forb/herb Endangered CA (E) Lupinus westianus Gulf Coast lupine Fabaceae Subshrub FL (T) Lupinus westianus var. aridorum Gulf Coast lupine Fabaceae Subshrub FL () Lupinus aridorum Endangered FL (E) Luzula acuminata hairy woodrush Juncaceae Graminoid IL (E), IN (E), NJ (E) Luzula arcuata curved woodrush Juncaceae Graminoid WA (S) Luzula bulbosa bulbous woodrush Juncaceae Graminoid OH (T), PA (E) Luzula confusa northern woodrush Juncaceae Graminoid ME (T), NH (E) Luzula parviflora smallflowered woodrush Juncaceae Graminoid MI (T) Luzula parviflora ssp. melanocarpa MA (E) Luzula spicata spiked woodrush Juncaceae Graminoid ME (T), NH (T), NY (E) Lycopodiella alopecuroides foxtail clubmoss Lycopodiaceae Subshrub, MA (E), NY (EV), Forb/herb PA (E), RI (E), TN (T) Lycopodium alopecuroides CT (SC) Lycopodiella appressa southern bog clubmoss Lycopodiaceae Subshrub, KY (E), ME (PX), Forb/herb NY (EV), PA (T) Lycopodiella caroliniana slender clubmoss Lycopodiaceae Subshrub, MD (E, X), NY (E) Forb/herb Lycopodiella cernua var. cernua staghorn clubmoss Lycopodiaceae Subshrub, FL () Forb/herb Lycopodium cernuum FL (CE) Lycopodiella inundata inundated clubmoss Lycopodiaceae Subshrub, IN (E), KY (E), Forb/herb NY (EV), WA (S) Lycopodium inundatum IA (E), IL (E) Lycopodiella margueritiae Marguerite's clubmoss Lycopodiaceae Subshrub, MI (T), OH (E) Forb/herb Lycopodiella subappressa northern bog clubmoss Lycopodiaceae Subshrub, IN (E), OH (E) Forb/herb Lycopodium annotinum stiff clubmoss Lycopodiaceae Subshrub, NJ (E), NY (EV), Forb/herb RI (E), TN (E, PX) Lycopodium clavatum running clubmoss Lycopodiaceae Subshrub, IA (E), IL (E), Forb/herb KY (E), NY (EV)

Lycopodium complanatum groundcedar Lycopodiaceae Subshrub, NY (E) Forb/herb Lycopodium dendroideum tree groundpine Lycopodiaceae Subshrub, IA (T), IL (E), Forb/herb IN (E), NY (EV), TN (SC), WA (S) Lycopodium digitatum fan clubmoss Lycopodiaceae Subshrub, NY (EV) Forb/herb Lycopodium hickeyi Pennsylvania clubmoss Lycopodiaceae Subshrub, IN (R) Forb/herb Lycopodium obscurum rare clubmoss Lycopodiaceae Subshrub, IN (R), NY (EV) Forb/herb Lycopodium sabinifolium savinleaf groundpine Lycopodiaceae Subshrub, ME (), PA () Forb/herb Diphasiastrum sabinifolium ME (E), PA (X) Lycopodium sitchense Sitka clubmoss Lycopodiaceae Subshrub, NY (E) Forb/herb Diphasiastrum sitchense ME (T), VT (T) Lycopodium tristachyum deeproot clubmoss Lycopodiaceae Subshrub, IN (T), NY (EV) Forb/herb Lycopus amplectens clasping water horehound Lamiaceae Forb/herb CT (SC), IN (E), MD (E) Lycopus rubellus taperleaf water horehound Lamiaceae Forb/herb MA (E), NY (E), PA (E), RI (SC) Lycopus virginicus Virginia water horehound Lamiaceae Forb/herb MI (T) Lygodium palmatum American climbing fern Lygodiaceae Vine, Forb/herb CT (SC), IN (E), MA (SC), MD (T), MI (E), NY (E), PA (R), RI (SC), VT (E) Lyonia ligustrina maleberry Ericaceae Shrub OH (PRX) Lyonia mariana piedmont staggerbush Ericaceae Shrub CT (SC), PA (E), RI (H) Lysiloma watsonii littleleaf false tamarind Fabaceae Tree, Shrub AZ () Lysiloma microphyllum var. thornberi AZ (SR) Lysimachia asperulifolia roughleaf yellow loosestrife Primulaceae Forb/herb Endangered NC (E) Lysimachia fraseri Fraser's yellow loosestrife Primulaceae Forb/herb GA (R), IL (E), KY (E), NC (E), TN (E) Lysimachia hybrida lowland yellow loosestrife Primulaceae Forb/herb MD (T), NY (E), PA (T) Lysimachia quadriflora fourflower yellow loosestrife Primulaceae Forb/herb NY (E), TN (SC) Lysimachia radicans trailing yellow loosestrife Primulaceae Forb/herb IL (E), KY (H) Lysimachia terrestris earth loosestrife Primulaceae Forb/herb KY (E), TN (E) Lysimachia thyrsiflora tufted loosestrife Primulaceae Forb/herb NH (T) Lythrum alatum winged lythrum Lythraceae Subshrub, CT (SC), MD (E), Forb/herb PA (E) Lythrum curtissii Curtiss' loosestrife Lythraceae Subshrub, FL (E), GA (T) Forb/herb Lythrum flagellare Florida loosestrife Lythraceae Forb/herb FL (E) Lythrum lineare wand lythrum Lythraceae Forb/herb NY (E) Macbridea alba white birds-in-a-nest Lamiaceae Forb/herb Threatened FL (E) Macbridea caroliniana Carolina birds-in-a-nest Lamiaceae Forb/herb NC (T) Machaeranthera asteroides var. lagunensis fall tansyaster Asteraceae Forb/herb CA (R) Macradenia lutescens longgland orchid Orchidaceae Forb/herb FL (E) Macranthera flammea flameflower Scrophulariaceae Forb/herb FL (E) Macroptilium supinum supine bean Fabaceae Forb/herb, Vine AZ () Phaseolus supinus AZ (SR) acuminata cucumber tree Magnoliaceae Tree FL (E), IN (E) Magnolia ashei Ashe's magnolia Magnoliaceae Tree, Shrub FL (E) Magnolia macrophylla bigleaf magnolia Magnoliaceae Tree AR (E), OH (E) Magnolia pyramidata pyramid magnolia Magnoliaceae Tree FL (E) Magnolia tripetala umbrella-tree Magnoliaceae Tree FL (E), IN (E), PA (R) Magnolia virginiana sweetbay Magnoliaceae Tree, Shrub MA (E), NY (E), PA (T), TN (T) Mahonia nevinii Nevin's barberry Berberidaceae Shrub CA (E) Mahonia pinnata ssp. insularis island barberry Berberidaceae Vine, Shrub CA (E) Mahonia repens creeping barberry Berberidaceae Subshrub, Shrub CA () Mahonia sonnei CA (E) Maianthemum canadense Canada mayflower Liliaceae Forb/herb KY (T) Maianthemum canadense var. interius NJ (E) Maianthemum racemosum ssp. amplexicaule feathery false lily of the valley Liliaceae Forb/herb AZ (SR) Maianthemum racemosum ssp. racemosum feathery false lily of the valley Liliaceae Forb/herb AZ (SR) Maianthemum stellatum starry false lily of the valley Liliaceae Forb/herb AZ (SR), KY (E) Smilacina stellata MD (E), TN (E) Maianthemum trifolium threeleaf false lily of the valley Liliaceae Forb/herb CT (), NJ (), OH (), RI () Smilacina trifolia CT (E), NJ (E), OH (PRX), RI (T) Malacothamnus clementinus San Clemente Island bushmallow Malvaceae Subshrub, Shrub Endangered CA (E) Malacothamnus fasciculatus Mendocino bushmallow Malvaceae Subshrub, Shrub CA () Malacothamnus fasciculatus var. nesioticus Endangered CA (E) Malaxis bayardii Bayard's adder's-mouth orchid Orchidaceae Forb/herb MA (E), NJ (E), NY (E), PA (R) Malaxis brachypoda white adder's-mouth orchid Orchidaceae Forb/herb CT (E), PA (E), VT (T) Malaxis monophyllos ssp. brachypoda ME (E), NY (EV) Malaxis monophyllos var. brachypoda MA (E), NH (E), NJ (E) Malaxis corymbosa Huachuca Mountain adder's-mouth orchid Orchidaceae Forb/herb AZ (SR) Malaxis paludosa bog adder's-mouth orchid Orchidaceae Forb/herb MN (E) Malaxis soulei Chiricahua adder's-mouth orchid Orchidaceae Forb/herb AZ () Malaxis macrostachya AZ (SR) Malaxis tenuis Arizona adder's-mouth orchid Orchidaceae Forb/herb AZ (SR) Malaxis unifolia green adder's-mouth orchid Orchidaceae Forb/herb CT (E), FL (E), IN (E), NH (T), NY (EV), RI (E) angustifolia southern crab apple Rosaceae Tree, Shrub FL (T), IL (E), KY (SC) Malus angustifolia var. angustifolia southern crab apple Rosaceae Tree, Shrub OH () Pyrus angustifolia OH (PRX) Malus coronaria sweet crab apple Rosaceae Tree, Shrub NY () Malus glaucescens NY (E) Malvastrum hispidum hispid false mallow Malvaceae Forb/herb KY (T) Mammillaria barbata greenflower nipple cactus Cactaceae Shrub AZ () Mammillaria viridiflora AZ (SR) Mammillaria grahamii Graham's nipple cactus Cactaceae Shrub AZ () Mammillaria grahamii var. grahamii AZ (SR) Mammillaria grahamii var. oliviae AZ (SR) Mammillaria microcarpa AZ (SR) Mammillaria heyderi var. heyderi little nipple cactus Cactaceae Shrub AZ () Mammillaria gummifera var. applanata AZ (SR) Mammillaria heyderi var. macdougalii Macdougal's nipple cactus Cactaceae Shrub AZ () Mammillaria gummifera AZ (SR) Mammillaria gummifera var. macdougalii AZ (SR) Mammillaria lasiacantha lacespine nipple cactus Cactaceae Shrub AZ (SR) Mammillaria mainiae counterclockwise nipple cactus Cactaceae Shrub AZ (SR) Mammillaria meiacantha little nipple cactus Cactaceae Shrub AZ (SR) Mammillaria tetrancistra common fishhook cactus Cactaceae Shrub AZ (SR), NV (CY) Mammillaria thornberi Thornber's nipple cactus Cactaceae Shrub AZ (SR) Mammillaria wrightii var. wilcoxii Wilcox's nipple cactus Cactaceae Shrub AZ (SR), NM (E) Mammillaria wrightii var. wrightii Wright's nipple cactus Cactaceae Shrub AZ (SR) Manfreda virginica false aloe Agavaceae Subshrub, OH () Forb/herb Agave virginica OH (T) Manihot walkerae Walker's manihot Euphorbiaceae Forb/herb Endangered TX (E) Manilkara jaimiqui wild dilly Sapotaceae Tree, Shrub FL (T) Marshallia grandiflora Monongahela Barbara's buttons Asteraceae Forb/herb KY (E), MD (E, X), PA (E), TN (E) Marshallia mohrii Mohr's Barbara's buttons Asteraceae Forb/herb Threatened GA (T) Marshallia obovata spoonshape Barbara's buttons Asteraceae Forb/herb FL (E), TN (T) Marshallia ramosa southern Barbara's buttons Asteraceae Forb/herb FL (E), GA (R) Marshallia trinervia broadleaf Barbara's buttons Asteraceae Forb/herb TN (T) Marsilea vestita hairy waterclover Marsileaceae Forb/herb IA (T), MN (E) Matelea alabamensis Alabama milkvine Asclepiadaceae Vine, Forb/herb FL (E), GA (T) Matelea baldwyniana Baldwin's milkvine Asclepiadaceae Vine, Forb/herb FL (E) Matelea carolinensis maroon Carolina milkvine Asclepiadaceae Vine, Forb/herb KY (E), MD (E) Matelea cynanchoides prairie milkvine Asclepiadaceae Forb/herb AR (E) Matelea decipiens oldfield milkvine Asclepiadaceae Forb/herb IL (E), MD (E, X) Matelea flavidula yellow Carolina milkvine Asclepiadaceae Vine, Forb/herb FL (E) Matelea floridana Florida milkvine Asclepiadaceae Vine, Forb/herb FL (E) Matelea gonocarpos angularfruit milkvine Asclepiadaceae Vine, Forb/herb FL (T) Matelea obliqua climbing milkvine Asclepiadaceae Vine, Forb/herb IL (T), MD (E), OH (T), PA (E) Gonolobus obliquus IN (R) Matelea pubiflora trailing milkvine Asclepiadaceae Vine, Forb/herb FL (E), GA (R) Matteuccia struthiopteris ostrich fern Dryopteridaceae Forb/herb IN (R), NY (EV) Matteuccia struthiopteris var. pensylvanica RI (SC) Maxillaria crassifolia hidden orchid Orchidaceae Forb/herb FL (E) Maxillaria parviflora purple tiger orchid Orchidaceae Forb/herb FL (E) Maytenus phyllanthoides Florida mayten Celastraceae Tree, Shrub FL (T) Mecardonia acuminata axilflower Scrophulariaceae Subshrub, MD (E) Forb/herb Meconella oregana white fairypoppy Papaveraceae Forb/herb WA (T) virginiana Indian cucumber Liliaceae Forb/herb FL (E), IL (E) Meehania cordata Meehan's mint Lamiaceae Forb/herb PA (E), TN (T) Melampyrum lineare narrowleaf cowwheat Scrophulariaceae Forb/herb IN (R), OH (T) Melampyrum lineare var. latifolium narrowleaf cowwheat Scrophulariaceae Forb/herb KY (T) Melampyrum lineare var. pectinatum narrowleaf cowwheat Scrophulariaceae Forb/herb KY (E) Melanthera nivea snow squarestem Asteraceae Forb/herb IL (E), KY (SC) Melanthera parvifolia small-leaf squarestem Asteraceae Forb/herb FL (T) Melica mutica twoflower melicgrass Poaceae Graminoid IL (E), MD (T) Melica nitens threeflower melicgrass Poaceae Graminoid IN (T), MD (T), MN (T), OH (E), PA (T) Melica smithii Smith's melicgrass Poaceae Graminoid WI (E) Melothria pendula Guadeloupe cucumber Cucurbitaceae Vine, Forb/herb IL (T), IN (X), MD (E) Mentzelia leucophylla Ash Meadows blazingstar Loasaceae Forb/herb Threatened NV (FP) Mentzelia mollis soft blazingstar Loasaceae Forb/herb OR (E) Mentzelia packardiae Packard's blazingstar Loasaceae Forb/herb OR (T) Menyanthes trifoliata buckbean Menyanthaceae Forb/herb IA (T), MD (E), NC (T), OH (T) Menziesia pilosa minniebush Ericaceae Shrub PA (R), TN (SC) Mertensia maritima oysterleaf Boraginaceae Forb/herb MA (E), NH (E) Mertensia paniculata tall bluebells Boraginaceae Subshrub, IA (E) Forb/herb Mertensia virginica Virginia bluebells Boraginaceae Forb/herb MI (T), NY (EV) Mesadenus lucayanus Florida Keys ladies'-tresses Orchidaceae Forb/herb FL () Spiranthes polyantha FL (E) Micranthemum micranthemoides Nuttall's mudflower Scrophulariaceae Forb/herb MD (E, X), NJ (E), PA (X) Microgramma heterophylla clinging snakefern Polypodiaceae Vine, Forb/herb FL (E) Microseris bigelovii coastal silverpuffs Asteraceae Forb/herb WA (PX) Microseris borealis northern microseris Asteraceae Forb/herb WA (S) Microseris howellii Howell's silverpuffs Asteraceae Forb/herb OR (T) Mikania scandens climbing hempvine Asteraceae Vine, Forb/herb IN (E), ME (PX), MI (PREX), NH (T) Milium effusum American milletgrass Poaceae Graminoid CT (SC), IL (E), IN (R), MA (T), NJ (E), TN (SC) Milla biflora Mexican star Liliaceae Forb/herb AZ (SR) Mimulus alatus sharpwing monkeyflower Scrophulariaceae Forb/herb CT (SC), IA (T), MA (E), MI (PREX), NY (R) Mimulus glabratus roundleaf monkeyflower Scrophulariaceae Forb/herb IA (T), IL (E) Mimulus glabratus var. michiganensis Michigan monkeyflower Scrophulariaceae Forb/herb Endangered MI (E) Mimulus jungermannioides liverwort monkeyflower Scrophulariaceae Forb/herb WA (PX) Mimulus moschatus muskflower Scrophulariaceae Forb/herb MA (E), NH (E) Mimulus pulsiferae candelabrum monkeyflower Scrophulariaceae Forb/herb WA (S)

Mimulus ringens var. colpophilus Allegheny monkeyflower Scrophulariaceae Forb/herb ME (SC) Mimulus suksdorfii Suksdorf's monkeyflower Scrophulariaceae Forb/herb WA (S) Minuartia caroliniana pine barren stitchwort Caryophyllaceae Forb/herb NY (R) Arenaria caroliniana RI (H) Minuartia cumberlandensis Cumberland stitchwort Caryophyllaceae Forb/herb KY (E) Arenaria cumberlandensis Endangered TN (E) Minuartia glabra Appalachian stitchwort Caryophyllaceae Forb/herb KY (T), MD (E), ME (SC), NH (T), NY (T), PA (T) Arenaria glabra CT (T) Arenaria groenlandica var. glabra RI (T) Minuartia godfreyi Godfrey's stitchwort Caryophyllaceae Forb/herb FL (E), NC (E) Arenaria godfreyi TN (E) Minuartia groenlandica Greenland stitchwort Caryophyllaceae Forb/herb ME (SC) Arenaria groenlandica TN (E) Minuartia marcescens serpentine stitchwort Caryophyllaceae Forb/herb VT (T) Minuartia michauxii Michaux's stitchwort Caryophyllaceae Forb/herb MA (T), MD (T) Minuartia michauxii var. michauxii Michaux's stitchwort Caryophyllaceae Forb/herb IN (), NJ (), RI () Arenaria stricta IN (R), NJ (E), RI (E) Minuartia nuttallii ssp. fragilis brittle sandwort Caryophyllaceae Forb/herb WA (S) Minuartia patula pitcher's stitchwort Caryophyllaceae Forb/herb IL (), IN (), OH () Arenaria patula IL (T), IN (E), OH (E) Minuartia rubella beautiful sandwort Caryophyllaceae Forb/herb ME (T), VT (T) Minuartia stricta bog stitchwort Caryophyllaceae Forb/herb NH (E) Minuartia uniflora oneflower stitchwort Caryophyllaceae Forb/herb NC (E) Mirabilis albida white four o'clock Nyctaginaceae Forb/herb, KY (E), TN (T) Subshrub Mirabilis hirsuta hairy four o'clock Nyctaginaceae Forb/herb IL (E) MacFarlane's four o'clock Nyctaginaceae Forb/herb Threatened OR (E) partridgeberry Rubiaceae Subshrub, IA (T) Forb/herb Mitella nuda naked miterwort Saxifragaceae Forb/herb CT (SC), PA (E) Moehringia lateriflora bluntleaf sandwort Caryophyllaceae Forb/herb MD (E) Moehringia macrophylla largeleaf sandwort Caryophyllaceae Forb/herb MA (E), MN (T), WI (E) Arenaria macrophylla CT (E), MI (T) Monarda bradburiana eastern beebalm Lamiaceae Forb/herb IN (E) Monarda clinopodia white bergamot Lamiaceae Forb/herb NJ (E), NY (E) Monarda didyma scarlet beebalm Lamiaceae Forb/herb MI (PREX), NY (EV) Monarda fistulosa wild bergamot Lamiaceae Subshrub, RI (H) Forb/herb Monarda punctata spotted beebalm Lamiaceae Subshrub, KY (H), OH (E), Forb/herb PA (E) Monardella linoides ssp. viminea willowy monardella Lamiaceae Subshrub, Endangered CA (E) Forb/herb Moneses uniflora single delight Pyrolaceae Forb/herb CT (E), OH (E), RI (T) Monotropa hypopitys pinesap Monotropaceae Forb/herb FL (E), IA (T) Monotropsis odorata pygmypipes Monotropaceae Forb/herb FL (E), KY (T), MD (E), TN (T) Montia chamissoi water minerslettuce Portulacaceae Forb/herb MN (E), PA (E) Montia diffusa spreading minerslettuce Portulacaceae Forb/herb WA (S) Montia fontana annual water minerslettuce Portulacaceae Forb/herb ME (SC) Morella caroliniensis southern bayberry Myricaceae Tree, Shrub MD () Myrica heterophylla MD (E) Morella pensylvanica northern bayberry Myricaceae Tree, Shrub NY (), OH () Myrica pensylvanica NY (EV), OH (E) Morus rubra red mulberry Moraceae Tree CT (E), MA (E), MI (T), VT (T) Muhlenbergia bushii nodding muhly Poaceae Graminoid KY (E) Muhlenbergia capillaris hairawn muhly Poaceae Graminoid CT (E), IN (E), MD (E), NJ (E), OH (PRX), PA (X) Muhlenbergia cuspidata plains muhly Poaceae Graminoid IN (E), KY (T), MI (PREX), OH (E), TN (E) Muhlenbergia glabriflora inland muhly Poaceae Graminoid KY (SC), TN (SC) Muhlenbergia glomerata spiked muhly Poaceae Graminoid WA (S) Muhlenbergia richardsonis mat muhly Poaceae Graminoid ME (T), MI (T) Muhlenbergia sobolifera rock muhly Poaceae Graminoid ME (PX), NH (T) Muhlenbergia torreyana New Jersey muhly Poaceae Graminoid MD (E), NC (E), TN (E) Muhlenbergia uniflora bog muhly Poaceae Graminoid PA (E) laxa bay forget-me-not Boraginaceae Forb/herb IN (E) Myrcianthes fragrans twinberry Myrtaceae Tree, Shrub FL (T) Myrica gale sweetgale Myricaceae Shrub NC (E), PA (T) Myriophyllum alterniflorum alternateflower watermilfoil Haloragaceae Forb/herb CT (E), MA (E), NY (T), RI (H) Myriophyllum farwellii Farwell's watermilfoil Haloragaceae Forb/herb MA (E), MI (T), NH (T), NY (T), PA (E) Myriophyllum heterophyllum twoleaf watermilfoil Haloragaceae Forb/herb KY (SC), OH (E), PA (E) Myriophyllum laxum loose watermilfoil Haloragaceae Forb/herb GA (T), NC (T) Myriophyllum pinnatum cutleaf watermilfoil Haloragaceae Forb/herb CT (SC), IN (E), KY (H), MA (SC), NJ (E), NY (E), RI (T), TN (T) Myriophyllum sibiricum shortspike watermilfoil Haloragaceae Forb/herb NJ (E), OH (T) Myriophyllum exalbescens PA (E) Myriophyllum tenellum slender watermilfoil Haloragaceae Forb/herb CT (SC), MD (E, X), NJ (E), PA (T) Myriophyllum verticillatum whorl-leaf watermilfoil Haloragaceae Forb/herb IN (T), MA (E), NJ (E), OH (E), PA (E) filifolia needleleaf waternymph Najadaceae Forb/herb FL (T) slender waternymph Najadaceae Forb/herb IN (E), KY (SC), MD (E, X), ME (SC), OH (E), PA (T) southern waternymph Najadaceae Forb/herb CT (SC), ME (PX) Najas guadalupensis ssp. muenscheri Muenscher's waternymph Najadaceae Forb/herb NY () Najas guadalupensis var. muenscheri NY (E) Najas guadalupensis ssp. olivacea Guadalupe waternymph Najadaceae Forb/herb NY () Najas guadalupensis var. olivacea NY (E) spiny naiad Najadaceae Forb/herb NY (E), PA (E) Napaea dioica glademallow Malvaceae Forb/herb IN (R), MN (T) Narthecium americanum yellow asphodel Liliaceae Forb/herb NC (E), NJ (E) Nasturtium gambelii Gambel's yellowcress Brassicaceae Forb/herb CA () Rorippa gambelii Endangered CA (T) Navarretia leucocephala ssp. pauciflora fewflower navarretia Polemoniaceae Forb/herb CA (T) Navarretia leucocephala ssp. plieantha manyflowered navarretia Polemoniaceae Forb/herb Endangered CA (E) Navarretia tagetina marigold pincushionplant Polemoniaceae Forb/herb WA (T) Nelumbo lutea American lotus Nelumbonaceae Forb/herb MI (T), NJ (E), PA (E) Nemacladus twisselmannii Twisselmann's threadplant Campanulaceae Forb/herb CA (R) Nemastylis floridana fallflowering pleatleaf Iridaceae Forb/herb FL (E) Nemophila aphylla smallflower baby blue eyes Hydrophyllaceae Forb/herb KY (T) Neobeckia aquatica lakecress Brassicaceae Forb/herb TN (SC), VT (T) Armoracia aquatica IN (E) Armoracia lacustris KY (T), MD (E), ME (PX), MI (T), NJ (E), OH (T), WI (E) Rorippa aquatica NY (T) Neostapfia colusana Colusagrass Poaceae Graminoid Threatened CA (E) Neotorularia humilis low northern-rockcress Brassicaceae Forb/herb MI (), VT () Braya humilis MI (T), VT (T) Nephrolepis biserrata giant swordfern Dryopteridaceae Forb/herb FL (T) Nestronia umbellula leechbrush Santalaceae Shrub GA (T), KY (E), TN (E), VA (E) Neurodium lanceolatum ribbon fern Polypodiaceae Forb/herb FL (E) Neviusia alabamensis Alabama snow-wreath Rosaceae Shrub AR (T), GA (T), TN (T) Nicotiana attenuata coyote tobacco Solanaceae Forb/herb WA (S) Nitrophila mohavensis Amargosa niterwort Chenopodiaceae Forb/herb Endangered CA (E), NV (FP) Nolina atopocarpa Florida beargrass Liliaceae Subshrub, Shrub FL (T) Nolina bigelovii Bigelow's nolina Liliaceae Tree, Shrub, AZ (HR, SR) Subshrub Nolina brittoniana Britton's beargrass Liliaceae Subshrub, Shrub Endangered FL (E) Nolina interrata Dehesa beargrass Liliaceae Subshrub, Shrub CA (E) Nolina microcarpa sacahuista Liliaceae Subshrub, Shrub AZ (HR, SR) Nolina parryi Parry's beargrass Liliaceae Tree, Shrub, AZ (HR, SR) Subshrub Nolina texana Texas sacahuista Liliaceae Subshrub, Shrub AZ () Nolina texana var. compacta AZ (HR, SR) Nothocalais cuspidata prairie false dandelion Asteraceae Forb/herb IL (E) Nothoscordum bivalve crowpoison Liliaceae Forb/herb IN (R), OH (T) Nothoscordum texanum Texas false garlic Liliaceae Forb/herb AZ (SR) Nuphar lutea ssp. advena yellow pond-lily Nymphaeaceae Forb/herb CT (), ME () Nuphar advena CT (SC), ME (SC) Nuphar lutea ssp. pumila yellow pond-lily Nymphaeaceae Forb/herb CT (), MA (), MI (), NJ () Nuphar microphylla CT (SC), MA (E), NJ (E) Nuphar pumila MI (E) Nuphar lutea ssp. variegata varigated yellow pond-lily Nymphaeaceae Forb/herb OH () Nuphar variegata OH (E) Nuttallanthus canadensis Canada toadflax Scrophulariaceae Forb/herb OH () Linaria canadensis OH (E) Nymphaea leibergii Leiberg's waterlily Nymphaeaceae Forb/herb ME (T), MN (T) Nymphaea odorata ssp. tuberosa American white waterlily Nymphaeaceae Forb/herb CT (SC) Nymphaea tetragona pygmy waterlily Nymphaeaceae Forb/herb WA (PX) Nymphoides aquatica big floatingheart Menyanthaceae Forb/herb MD (E) Nymphoides cordata little floatingheart Menyanthaceae Forb/herb MD (E), PA (T) Ocimum campechianum least basil Lamiaceae Forb/herb FL (E) Oclemena acuminata whorled wood aster Asteraceae Forb/herb KY (), OH () Aster acuminatus KY (T), OH (PRX) Oclemena ×blakei aster Asteraceae Forb/herb Aster blakei CT (E) Oclemena nemoralis bog aster Asteraceae Forb/herb CT (), PA () Aster nemoralis CT (E), PA (E) Odontosoria clavata clubbed creepingfern Dennstaedtiaceae Forb/herb FL () Sphenomeris clavata FL (E) argillicola shale barren evening primrose Onagraceae Forb/herb PA (T) Oenothera caespitosa ssp. caespitosa tufted evening primrose Onagraceae Forb/herb, WA (S) Subshrub Oenothera caespitosa ssp. marginata tufted evening primrose Onagraceae Forb/herb, WA (S) Subshrub Oenothera californica ssp. eurekensis Eureka Dunes evening primrose Onagraceae Forb/herb CA (R) Oenothera clelandii Cleland's evening primrose Onagraceae Forb/herb OH (E) Oenothera deltoides ssp. howellii Antioch Dunes evening primrose Onagraceae Forb/herb Endangered CA (E) Oenothera flava yellow evening primrose Onagraceae Forb/herb WA (PX) Oenothera fruticosa narrowleaf evening primrose Onagraceae Forb/herb CT (SC) Oenothera humifusa seabeach evening primrose Onagraceae Subshrub, NJ (E) Forb/herb Oenothera laciniata cutleaf evening primrose Onagraceae Forb/herb NY (E) Oenothera linifolia threadleaf evening primrose Onagraceae Forb/herb KY (E) Oenothera macrocarpa ssp. macrocarpa bigfruit evening primrose Onagraceae Forb/herb TN (T) Oenothera oakesiana Oakes' evening primrose Onagraceae Forb/herb KY (H), OH (T) Oenothera parviflora var. oakesiana NY (T) Oenothera parviflora northern evening primrose Onagraceae Forb/herb OH (T), TN (SC) Oenothera perennis little evening primrose Onagraceae Forb/herb IA (T), IL (T), IN (T), KY (E) Oenothera pilosella ssp. sessilis meadow evening primrose Onagraceae Forb/herb AR (T) Oenothera triloba stemless evening primrose Onagraceae Forb/herb IN (X), KY (T) Oenothera wolfii Wolf's evening primrose Onagraceae Forb/herb OR (T) Okenia hypogaea burrowing four o'clock Nyctaginaceae Forb/herb FL (E) Oldenlandia uniflora clustered mille graines Rubiaceae Subshrub, KY (E), NY (E) Forb/herb Oligoneuron album prairie goldenrod Asteraceae Forb/herb CT (), IN (), MA (), NC (), NH (), OH (), TN () Aster ptarmicoides NH (E) ptarmicoides CT (E), IN (R), MA (E), NC (E), OH (PRX), TN (E) Oligoneuron houghtonii Houghton's goldenrod Asteraceae Forb/herb MI (), NY () Solidago houghtonii Threatened MI (T), NY (E) Oligoneuron ohioense Ohio goldenrod Asteraceae Forb/herb NY () Solidago ohioensis NY (T) Oligoneuron riddellii Riddell's goldenrod Asteraceae Forb/herb AR () Solidago riddellii AR (T) Oligoneuron rigidum var. rigidum stiff goldenrod Asteraceae Forb/herb CT (), MD (), NJ (), NY (), PA (), RI () Solidago rigida CT (E), MD (E, X), NJ (E), NY (T), PA (E), RI (H) tesota desert ironwood Fabaceae Tree, Shrub AZ (HR, SA) Omalotheca supina alpine arctic cudweed Asteraceae Forb/herb ME (E) Gnaphalium supinum NH (E) Omalotheca sylvatica woodland arctic cudweed Asteraceae Forb/herb ME (SC), VT (E) Gnaphalium sylvaticum MI (T), NY (E) Oncidium floridanum Florida orchid Orchidaceae Forb/herb FL (E) Onosmodium bejariense var. bejariense soft-hair marbleseed Boraginaceae Forb/herb KY (), MD (), MI () Onosmodium molle MD (E), MI (PREX) Onosmodium molle ssp. molle KY (E) Onosmodium bejariense var. hispidissimum softhair marbleseed Boraginaceae Forb/herb IN (), KY (), PA (), TN () Onosmodium hispidissimum IN (E), PA (E), TN (SC) Onosmodium molle ssp. hispidissimum KY (E) Onosmodium bejariense var. occidentale western marbleseed Boraginaceae Forb/herb KY (), TN () Onosmodium molle ssp. occidentale KY (E), TN (T) Onosmodium bejariense var. subsetosum softhair marbleseed Boraginaceae Forb/herb TN () Onosmodium molle ssp. subsetosum TN (E) Onosmodium virginianum wild Job's tears Boraginaceae Forb/herb CT (E), MD (E), NJ (E), NY (E), PA (X), RI (H) Ophioglossum crotalophoroides bulbous adderstongue Ophioglossaceae Forb/herb TN (SC) Ophioglossum engelmannii limestone adderstongue Ophioglossaceae Forb/herb IN (R), OH (E), PA (E) Ophioglossum pusillum northern adderstongue Ophioglossaceae Forb/herb MA (T), ME (SC), NY (EV), RI (E), WA (T) Ophioglossum vulgatum CT (T) Ophioglossum vulgatum southern adderstongue Ophioglossaceae Forb/herb MI (T) Ophioglossum pycnostichum PA (X) Ophioglossum vulgatum var. pycnostichum NJ (E) Oplopanax horridus devilsclub Araliaceae Shrub MI (T) Opuntia aurea golden pricklypear Cactaceae Shrub, Tree AZ () Opuntia basilaris var. aurea AZ (SR) Opuntia basilaris var. basilaris beavertail pricklypear Cactaceae Tree, Shrub AZ (SR), NV (CY) Opuntia basilaris var. longiareolata beavertail pricklypear Cactaceae Tree, Shrub AZ (SR) Opuntia basilaris var. treleasei Trelease's beavertail pricklypear Cactaceae Tree, Shrub AZ (SR), CA (E) Opuntia chlorotica dollarjoint pricklypear Cactaceae Shrub AZ (SR), NV (CY) Opuntia ×curvospina searchlight pricklypear Cactaceae Shrub AZ (SR) Opuntia engelmannii var. engelmannii cactus apple Cactaceae Shrub AZ (SR) Opuntia engelmannii var. flavispina cactus apple Cactaceae Shrub AZ (SR) Opuntia fragilis brittle pricklypear Cactaceae Shrub IA (T), IL (E), MI (E), NV (CY), WI (T) Opuntia fragilis var. brachyarthra AZ (SR) Opuntia fragilis var. fragilis AZ (SR) Opuntia humifusa devil's-tongue Cactaceae Shrub CT (SC), MA (E), NY (EV), PA (R) Opuntia laevis tulip pricklypear Cactaceae Shrub AZ ()

Opuntia phaeacantha var. laevis AZ (SR) Opuntia macrocentra purple pricklypear Cactaceae Tree, Shrub AZ (SR) Opuntia macrorhiza twistspine pricklypear Cactaceae Shrub IA (E) Opuntia macrorhiza var. macrorhiza twistspine pricklypear Cactaceae Shrub AZ (SR) Opuntia macrorhiza var. pottsii twistspine pricklypear Cactaceae Shrub AZ (SR) Opuntia martiniana seashore cactus Cactaceae Shrub AZ (SR) Opuntia phaeacantha tulip pricklypear Cactaceae Shrub NV (CY) Opuntia canada AZ (SR) Opuntia charlestonensis NV (CY) Opuntia phaeacantha var. major AZ (SR) Opuntia phaeacantha var. phaeacantha AZ (SR) Opuntia phaeacantha var. superbospina AZ (SR) Opuntia polyacantha var. arenaria El Paso pricklypear Cactaceae Shrub NM () Opuntia arenaria NM (E) Opuntia polyacantha var. erinacea grizzlybear pricklypear Cactaceae Shrub AZ (), NV () Opuntia erinacea var. erinacea AZ (SR), NV (CY) Opuntia polyacantha var. hystricina grizzlybear pricklypear Cactaceae Shrub AZ () Opuntia erinacea var. hystricina AZ (SR) Opuntia polyacantha var. nicholii Navajo Bridge pricklypear Cactaceae Shrub AZ () Opuntia nicholii AZ (SR) Opuntia polyacantha var. polyacantha hairspine pricklypear Cactaceae Shrub NV (CY) Opuntia erinacea var. ursina AZ (SR) Opuntia erinacea var. utahensis AZ (SR), NV (CY) Opuntia polyacantha var. juniperina AZ (SR) Opuntia polyacantha var. rufispina AZ (SR), NV (CY) Opuntia polyacantha var. trichophora AZ (SR) Opuntia santa-rita Santa Rita pricklypear Cactaceae Tree, Shrub AZ (SR) Opuntia stricta erect pricklypear Cactaceae Shrub FL (T) Opuntia triacantha Spanish lady Cactaceae Shrub FL (E) Opuntia ×vaseyi Vasey's coastal pricklypear Cactaceae Shrub AZ () Opuntia littoralis var. vaseyi AZ (SR) Orbexilum macrophyllum largeleaf leather-root Fabaceae Forb/herb NC (E) Orbexilum onobrychis French-grass Fabaceae Forb/herb IA () Psoralea onobrychis IA (E) Orcuttia californica California Orcutt grass Poaceae Graminoid Endangered CA (E) Orcuttia inaequalis San Joaquin Valley Orcutt grass Poaceae Graminoid Threatened CA (E) Orcuttia pilosa hairy Orcutt grass Poaceae Graminoid Endangered CA (E) Orcuttia tenuis slender Orcutt grass Poaceae Graminoid Threatened CA (E) Orcuttia viscida Sacramento Orcutt grass Poaceae Graminoid Endangered CA (E) Orobanche fasciculata clustered broomrape Orobanchaceae Forb/herb IA (E), IL (E), IN (E), MI (T), WI (T) Orobanche ludoviciana Louisiana broomrape Orobanchaceae Forb/herb IL (T), IN (T), KY (H), OH (PRX), TN (SC), WI (E) Orontium aquaticum goldenclub Araceae Forb/herb CT (SC), KY (T), MA (E), NY (T), PA (R), RI (E) Orthilia secunda sidebells wintergreen Pyrolaceae Subshrub MD (E, X), OH (PRX) Pyrola secunda CT (SC), IA (T), IN (X), RI (T) Orthocarpus bracteosus rosy owl's-clover Scrophulariaceae Forb/herb WA (T) Oryzopsis asperifolia roughleaf ricegrass Poaceae Graminoid IN (E), MD (T), NJ (E), OH (E) Osmorhiza berteroi sweetcicely Apiaceae Forb/herb ME (T), MN (E) Osmorhiza chilensis NH (E) Osmorhiza depauperata bluntseed sweetroot Apiaceae Forb/herb MI (T) Osmorhiza longistylis longstyle sweetroot Apiaceae Forb/herb RI (T) Osmunda cinnamomea cinnamon fern Osmundaceae Forb/herb FL (CE), IA (E), NY (EV) Osmunda claytoniana interrupted fern Osmundaceae Forb/herb AR (T), NY (EV) Osmunda regalis royal fern Osmundaceae Forb/herb FL (CE), IA (T), NY (EV) Oxalis illinoensis Illinois woodsorrel Oxalidaceae Forb/herb IL (E), IN (R) Oxalis montana mountain woodsorrel Oxalidaceae Forb/herb OH (PRX) Oxalis priceae tufted yellow woodsorrel Oxalidaceae Forb/herb KY (H) Oxalis suksdorfii Suksdorf woodsorrel Oxalidaceae Forb/herb WA (S) Oxalis violacea violet woodsorrel Oxalidaceae Forb/herb CT (SC), MA (E), MI (T), NY (T), RI (E) Oxydendrum arboreum sourwood Ericaceae Tree, Shrub IN (T), MD (E) Oxypolis canbyi Canby's cowbane Apiaceae Forb/herb Endangered GA (E), MD (E), NC (E) Oxypolis greenmanii giant cowbane Apiaceae Forb/herb FL (E) Oxypolis rigidior stiff cowbane Apiaceae Forb/herb NY (E) Oxyria digyna alpine mountainsorrel Polygonaceae Forb/herb NH (T) Oxytropis borealis var. viscida viscid locoweed Fabaceae Forb/herb WA (S) Oxytropis viscida MN (E) Oxytropis campestris field locoweed Fabaceae Forb/herb ME (T) Oxytropis campestris var. chartacea field locoweed Fabaceae Forb/herb Threatened WI (E) Oxytropis campestris var. columbiana field locoweed Fabaceae Forb/herb WA (T) Oxytropis campestris var. wanapum field locoweed Fabaceae Forb/herb WA (E) Oxytropis monticola yellowflower locoweed Fabaceae Forb/herb WA () Oxytropis campestris var. gracilis WA (S) Pachycereus schottii senita cactus Cactaceae Tree, Shrub AZ () Lophocereus schottii AZ (SR) Pachysandra procumbens Allegheny-spurge Buxaceae Subshrub, FL (E), IN (E) Forb/herb Packera anonyma Small's ragwort Asteraceae Forb/herb PA () Senecio anonymus PA (R) Packera antennariifolia shale barren ragwort Asteraceae Forb/herb PA () Senecio antennariifolius PA (E) Packera cana woolly groundsel Asteraceae Forb/herb, MN () Subshrub Senecio canus MN (E) Packera franciscana San Francisco Peaks ragwort Asteraceae Forb/herb AZ () Senecio franciscanus Threatened AZ (HS) Packera ganderi Gander's ragwort Asteraceae Forb/herb CA () Senecio ganderi CA (R) Packera indecora elegant groundsel Asteraceae Forb/herb MI (), WI () Senecio indecorus MI (T), WI (T) Packera layneae Layne's ragwort Asteraceae Forb/herb CA () Senecio layneae Threatened CA (R) Packera millefolium piedmont ragwort Asteraceae Forb/herb GA (), NC () Senecio millefolium GA (T), NC (T) Packera paupercula balsam groundsel Asteraceae Forb/herb CT (), NH (), OH () Senecio pauperculus CT (E), NH (T), OH (T) Packera plattensis prairie groundsel Asteraceae Forb/herb PA () Senecio plattensis PA (X) Packera quaerens Mogollon Mountain ragwort Asteraceae Forb/herb AZ () Senecio quaerens AZ (SR) Packera schweinitziana Schweinitz's ragwort Asteraceae Forb/herb NC (), TN () Senecio schweinitzianus NC (E), TN (T) Panax quinquefolius American ginseng Araliaceae Forb/herb CT (SC), MA (SC), ME (E), MI (T), NC (SC), NH (T), NY (EV), PA (V), RI (E), TN (CE, SC) Panicum abscissum cutthroat grass Poaceae Graminoid FL (E) Panicum amarum bitter panicgrass Poaceae Graminoid CT (T), RI (SC) Panicum amarum var. amarulum coastal panicgrass Poaceae Graminoid PA (E) Panicum flexile wiry panicgrass Poaceae Graminoid MD (E), NJ (E), NY (T), VT (E) Panicum gattingeri Gattinger's panicgrass Poaceae Graminoid MA () Panicum philadelphicum ssp. gattingeri MA (SC) Panicum hemitomon maidencane Poaceae Graminoid TN (SC) Panicum philadelphicum Philadelphia panicgrass Poaceae Graminoid IA (T), MA (SC), NH (E), OH (T), RI (SC) Panicum tuckermanii OH (E), PA (T) Panicum rigidulum redtop panicgrass Poaceae Graminoid RI (SC) Panicum rigidulum var. elongatum redtop panicgrass Poaceae Graminoid CT (SC) Panicum stipitatum NY (E) Panicum rigidulum var. pubescens redtop panicgrass Poaceae Graminoid MA (T) Panicum longifolium IN (X), MI (T), OH (PRX) Panicum verrucosum warty panicgrass Poaceae Graminoid CT (SC), IN (T), MI (T), OH (E) Parietaria pensylvanica Pennsylvania pellitory Urticaceae Forb/herb ME (PX) florida blue paloverde Fabaceae Tree, Shrub AZ () Cercidium floridum AZ (SA) yellow paloverde Fabaceae Tree, Shrub AZ () Cercidium microphyllum AZ (SA) Parnassia asarifolia kidneyleaf grass of Parnassus Saxifragaceae Forb/herb KY (E), MD (E) Parnassia caroliniana Carolina grass of Parnassus Saxifragaceae Forb/herb FL (E), NC (E) Parnassia fimbriata var. hoodiana fringed grass of Parnassus Saxifragaceae Forb/herb WA (S) Parnassia glauca fen grass of Parnassus Saxifragaceae Forb/herb ME (SC), NH (T), NY (EV), PA (E), RI (H) Parnassia grandifolia largeleaf grass of Parnassus Saxifragaceae Forb/herb FL (E), KY (E), NC (T), TN (SC) Parnassia kotzebuei Kotzebue's grass of Parnassus Saxifragaceae Forb/herb WA (S) Parnassia palustris marsh grass of Parnassus Saxifragaceae Forb/herb MI (T), WI (T) Parnassia palustris var. parviflora smallflower grass of Parnassus Saxifragaceae Forb/herb WI () Parnassia parviflora WI (E) Parnassia palustris var. tenuis marsh grass of Parnassus Saxifragaceae Forb/herb WA () Parnassia palustris var. neogaea WA (S) Paronychia argyrocoma silvery nailwort Caryophyllaceae Forb/herb KY (E), MA (E), ME (T), TN (T) Paronychia argyrocoma var. albimontana NH (T) Paronychia canadensis smooth forked nailwort Caryophyllaceae Forb/herb MN (T), NH (T) Paronychia chartacea paper nailwort Caryophyllaceae Forb/herb Threatened FL (E) Paronychia fastigiata hairy forked nailwort Caryophyllaceae Forb/herb CT (SC), MN (E) Paronychia fastigiata var. nuttallii hairy forked nailwort Caryophyllaceae Forb/herb PA (E) Paronychia virginica yellow nailwort Caryophyllaceae Subshrub, MD (E) Forb/herb Parthenium integrifolium wild quinine Asteraceae Forb/herb MD (E), MN (E), PA (X), WI (T) Paspalidium chapmanii Chapman's bristlegrass Poaceae Graminoid FL () Setaria chapmanii FL (E) Paspalum boscianum bull crowngrass Poaceae Graminoid KY (SC) Paspalum dissectum mudbank crowngrass Poaceae Graminoid IL (E), MD (T) Paspalum floridanum Florida paspalum Poaceae Graminoid PA () Paspalum floridanum var. glabratum PA (X) Paspalum fluitans horsetail paspalum Poaceae Graminoid MD (E) Paspalum laeve field paspalum Poaceae Graminoid CT (E) Paspalum laeve var. circulare NY (E) Paspalum laeve var. pilosum NY (E) Paspalum setaceum thin paspalum Poaceae Graminoid NY (T) Paspalum setaceum var. psammophilum CT (SC), NY (E), RI (SC) purple passionflower Passifloraceae Vine, Forb/herb IN (R), OH (T) Passiflora lutea yellow passionflower Passifloraceae Vine, Forb/herb PA (E) Passiflora multiflora whiteflower passionflower Passifloraceae Vine, Forb/herb FL (E) Passiflora pallens pineland passionflower Passifloraceae Vine, Forb/herb FL (E) Passiflora sexflora goatsfoot Passifloraceae Vine FL (E) Patis racemosa blackseed ricegrass Poaceae Graminoid Oryzopsis racemosa IN (T), MD (T), OH (T) Pavonia paludicola swampbush Malvaceae Subshrub, Shrub FL (E) Paxistima canbyi Canby's mountain-lover Celastraceae Subshrub, Shrub KY (T), MD (E), OH (E), PA (E), TN (E) Pecluma dispersa widespread rockcap fern Polypodiaceae Forb/herb FL () Polypodium dispersum FL (E) Pecluma plumula plumed rockcap fern Polypodiaceae Forb/herb FL () Polypodium plumula FL (E) Pedicularis dudleyi Dudley's lousewort Scrophulariaceae Forb/herb CA (R) Pedicularis furbishiae Furbish's lousewort Scrophulariaceae Forb/herb Endangered ME (E) Pedicularis lanceolata swamp lousewort Scrophulariaceae Forb/herb CT (SC), KY (H), MA (E), MD (E), NY (T), PA (E), TN (T) Pedicularis rainierensis Mt. Rainier lousewort Scrophulariaceae Forb/herb WA (S) Pediocactus bradyi Brady's pincushion cactus Cactaceae Shrub Endangered AZ (HS) Pediocactus knowltonii Knowlton's miniature cactus Cactaceae Shrub Endangered NM (E) Pediocactus paradinei Kaibab pincushion cactus Cactaceae Shrub AZ (HS) Pediocactus peeblesianus Navajo pincushion cactus Cactaceae Shrub AZ () Pediocactus peeblesianus var. fickeiseniae AZ (HS) Pediocactus peeblesianus var. peeblesianus Endangered AZ (HS) Pediocactus sileri Siler pincushion cactus Cactaceae Subshrub Threatened AZ (HS) Pediocactus simpsonii var. robustior mountain ball cactus Cactaceae Shrub NV (CY) Pediocactus simpsonii var. simpsonii mountain ball cactus Cactaceae Shrub AZ (SR), NV (CY) Pediomelum digitatum palmleaf Indian breadroot Fabaceae Forb/herb AR () Psoralea digitata var. parvifolia AR (T) Pediomelum hypogaeum var. subulatum subterranean Indian breadroot Fabaceae Forb/herb AR () Psoralea subulata AR (E) Pelexia adnata hachuela Orchidaceae Forb/herb FL () Spiranthes adnata FL (E) Pellaea atropurpurea purple cliffbrake Pteridaceae Forb/herb FL (E), IA (E), MI (T), NY (EV), RI (E) Pellaea brachyptera Sierra cliffbrake Pteridaceae Forb/herb WA (S) Pellaea breweri Brewer's cliffbrake Pteridaceae Forb/herb WA (S) Pellaea glabella smooth cliffbrake Pteridaceae Forb/herb CT (E), MD (E), NY (T) Pellaea wrightiana Wright's cliffbrake Pteridaceae Forb/herb NC (E, SC) Peltandra virginica green arrow arum Araceae Forb/herb IA (E) Peniocereus greggii nightblooming cereus Cactaceae Shrub NM (E) Peniocereus greggii var. greggii nightblooming cereus Cactaceae Shrub AZ (SR), NM (E) Peniocereus greggii var. transmontanus nightblooming cereus Cactaceae Shrub AZ (SR) Penstemon albomarginatus whitemargin beardtongue Scrophulariaceae Forb/herb AZ (SR) Penstemon barrettiae Barrett's beardtongue Scrophulariaceae Subshrub, WA (T) Forb/herb Penstemon bicolor ssp. roseus pinto beardtongue Scrophulariaceae Forb/herb AZ (SR) Penstemon calycosus longsepal beardtongue Scrophulariaceae Forb/herb MI (T) Penstemon canescens eastern gray beardtongue Scrophulariaceae Forb/herb IN (T), OH (T) Penstemon clutei Sunset Crater beardtongue Scrophulariaceae Forb/herb AZ (SR) Penstemon deamii Deam's beardtongue Scrophulariaceae Forb/herb IN (R) Penstemon deustus var. variabilis scabland penstemon Scrophulariaceae Subshrub, WA (S) Forb/herb Penstemon digitalis foxglove beardtongue Scrophulariaceae Forb/herb RI (SC) Penstemon discolor Cataiina beardtongue Scrophulariaceae Subshrub AZ (HS) Penstemon dissectus dissected beardtongue Scrophulariaceae Forb/herb GA (R) Penstemon distans Mt. Tumbull beardtongue Scrophulariaceae Subshrub, AZ (SR) Forb/herb Penstemon gracilis lilac penstemon Scrophulariaceae Forb/herb IA (T), MI (E) Penstemon grandiflorus large beardtongue Scrophulariaceae Forb/herb IL (E) Penstemon haydenii blowout beardtongue Scrophulariaceae Forb/herb Endangered NE (E) Penstemon hirsutus hairy beardtongue Scrophulariaceae Forb/herb MA (E), RI (SC) Penstemon laevigatus eastern smooth beardtongue Scrophulariaceae Forb/herb NJ (E), OH (E) Penstemon linarioides ssp. maguirei Maguire's penstemon Scrophulariaceae Subshrub, AZ (SR) Forb/herb Penstemon murrayanus scarlet beardtongue Scrophulariaceae Forb/herb AR (T) Penstemon pallidus pale beardtongue Scrophulariaceae Forb/herb OH (T) Penstemon brevisepalus IL (E) Penstemon tubaeflorus white wand beardtongue Scrophulariaceae Forb/herb IN (X), OH (PRX), TN (SC) Pentachaeta bellidiflora whiteray pygmydaisy Asteraceae Forb/herb Endangered CA (E) Pentachaeta lyonii Lyon's pygmydaisy Asteraceae Forb/herb Endangered CA (E) Penthorum sedoides ditch stonecrop Crassulaceae Forb/herb RI (SC) Peperomia glabella cypress peperomia Piperaceae Forb/herb FL (E) Peperomia humilis Polynesian peperomia Piperaceae Forb/herb FL (E) Peperomia magnoliifolia spoonleaf peperomia Piperaceae Forb/herb FL (E) Peperomia obtusifolia baby rubberplant Piperaceae Forb/herb FL (E) Peperomia rotundifolia yerba linda Piperaceae Vine, Forb/herb FL (E) Perideridia americana eastern yampah Apiaceae Forb/herb IN (E), KY (T), OH (PRX), TN (E) Perityle ajoensis Ajo rockdaisy Asteraceae Subshrub, AZ (SR) Forb/herb Perityle cochisensis Cochise rockdaisy Asteraceae Subshrub, AZ (SR) Forb/herb Persea borbonia redbay Lauraceae Tree, Shrub MD (E) Persea palustris swamp bay Lauraceae Tree, Shrub AR (E) Petasites frigidus var. palmatus arctic sweet coltsfoot Asteraceae Forb/herb CT (T), MA (E), NH (E), NY (E), VT (T) Petasites frigidus var. sagittatus arrowleaf sweet coltsfoot Asteraceae Forb/herb MI (), WI () Petasites sagittatus MI (T), WI (T) Petrophytum cinerascens halfshrub rockmat Rosaceae Subshrub WA (T) Phacelia argentea sanddune phacelia Hydrophyllaceae Forb/herb OR (T) Phacelia covillei Coville's phacelia Hydrophyllaceae Forb/herb MD (E) Phacelia dubia smallflower phacelia Hydrophyllaceae Forb/herb OH (PRX) Phacelia franklinii Franklin's phacelia Hydrophyllaceae Forb/herb MI (T) Phacelia gilioides Brand's phacelia Hydrophyllaceae Forb/herb IL (E) Phacelia inconspicua hidden phacelia Hydrophyllaceae Forb/herb NV (FP) Phacelia lenta sticky phacelia Hydrophyllaceae Forb/herb WA (T) Phacelia minutissima small phacelia Hydrophyllaceae Forb/herb WA (S) Phacelia ranunculacea oceanblue phacelia Hydrophyllaceae Forb/herb IN (E), KY (SC), OH (E), TN (SC) Phacelia tetramera fourpart phacelia Hydrophyllaceae Forb/herb WA (S) Phalaris caroliniana Carolina canarygrass Poaceae Graminoid MD (E, X) Pharus lappulaceus Cape Francais stalkgrass Poaceae Graminoid FL () Pharus glaber FL (E) Phaseolus polystachios var. polystachios thicket bean Fabaceae Vine, Forb/herb CT () Phaseolus polystachios var. aquilonius CT (SC) Phegopteris connectilis long beechfern Thelypteridaceae Forb/herb NY (EV), RI (T) Thelypteris phegopteris IA (E), IL (E), TN (SC) Phegopteris hexagonoptera broad beechfern Thelypteridaceae Forb/herb ME (SC), MN (T), NY (EV) Phemeranthus calcaricus limestone fameflower Portulacaceae Forb/herb, KY (), TN () Subshrub Talinum calcaricum KY (E), TN (SC) Phemeranthus calycinus largeflower fameflower Portulacaceae Forb/herb, IL () Subshrub Talinum calycinum IL (E) Phemeranthus humilis Pinos Altos fameflower Portulacaceae Forb/herb AZ () Talinum humile AZ (SR) Phemeranthus mengesii Menges' fameflower Portulacaceae Forb/herb, TN () Subshrub Talinum mengesii TN (T) Phemeranthus parviflorus sunbright Portulacaceae Forb/herb, IA () Subshrub Talinum parviflorum IA (T) Phemeranthus parvulus tepic flameflower Portulacaceae Forb/herb Talinum marginatum AZ (SR) Phemeranthus rugospermus prairie fameflower Portulacaceae Forb/herb IA (), IN (), MN () Talinum rugospermum IA (E), IN (T), MN (E) Phemeranthus sediformis Okanogan fameflower Portulacaceae Forb/herb WA () Talinum sediforme WA (S) Phemeranthus teretifolius quill fameflower Portulacaceae Forb/herb, KY (), MD (), Subshrub PA (), TN () Talinum teretifolium KY (T), MD (T), PA (T), TN (T) Phemeranthus validulus Tusayan fameflower Portulacaceae Forb/herb AZ () Talinum validulum AZ (SR) Philadelphus inodorus scentless mock Hydrangeaceae Shrub KY (T) Philadelphus pubescens hoary mock orange Hydrangeaceae Shrub KY (E) Phleum alpinum alpine timothy Poaceae Graminoid ME (T), MI (PREX), NH (T) Phlox amplifolia largeleaf phlox Polemoniaceae Forb/herb IN (T) Phlox bifida cleft phlox Polemoniaceae Subshrub MI (T) Phlox bifida ssp. bifida cleft phlox Polemoniaceae Subshrub KY (T) Phlox bifida ssp. stellaria cleft phlox Polemoniaceae Subshrub IN (E), KY (T), TN (T) Phlox carolina thickleaf phlox Polemoniaceae Forb/herb MD (E, X) Phlox divaricata wild blue phlox Polemoniaceae Forb/herb NJ (E) Phlox glaberrima smooth phlox Polemoniaceae Forb/herb MD (E, X) Phlox glaberrima ssp. interior smooth phlox Polemoniaceae Forb/herb WI (E) Phlox hirsuta Yreka phlox Polemoniaceae Subshrub Endangered CA (E) Phlox latifolia wideflower phlox Polemoniaceae Forb/herb MD (E, X), OH (E) Phlox ovata IN (E), PA (E) Phlox maculata wild sweetwilliam Polemoniaceae Forb/herb MI (T), NY (E) Phlox nivalis ssp. texensis Texan phlox Polemoniaceae Subshrub, Endangered TX (E) Forb/herb Phlox pilosa downy phlox Polemoniaceae Forb/herb MD (E), NJ (E), NY (E), PA (E) Phlox pilosa ssp. ozarkana Ozark phlox Polemoniaceae Forb/herb TN (SC) Phlox pilosa ssp. sangamonensis downy phlox Polemoniaceae Forb/herb IL (E) Phlox subulata moss phlox Polemoniaceae Subshrub, TN (T) Forb/herb Phlox subulata ssp. brittonii Britton's phlox Polemoniaceae Subshrub, PA (E) Forb/herb Phoebanthus tenuifolius pineland false sunflower Asteraceae Forb/herb FL (T) Pholisma arenarium desert christmas tree Lennoaceae Forb/herb AZ (HS) Pholisma sonorae sandfood Lennoaceae Forb/herb AZ (HS) leucarpum mistletoe Viscaceae Subshrub, Shrub PA () Phoradendron serotinum PA (X) Phoradendron rubrum mahogany mistletoe Viscaceae Subshrub, Shrub FL (E) Phryma leptostachya American lopseed Verbenaceae Forb/herb ME (PX) Phyla lanceolata lanceleaf fogfruit Verbenaceae Forb/herb NJ (E), PA (R) Phyla stoechadifolia southern fogfruit Verbenaceae Forb/herb FL (E) Phyllanthus caroliniensis Carolina leaf-flower Euphorbiaceae Forb/herb OH (E), PA (E) Phyllanthus liebmannianus Florida leaf-flower Euphorbiaceae Forb/herb, FL (E) Subshrub Phyllodoce caerulea blue mountainheath Ericaceae Subshrub, Shrub ME (T), NH (T) Physalis pubescens var. integrifolia husk tomato Solanaceae Forb/herb NY (E) Physalis pruinosa ME (PX) Physalis virginiana Virginia groundcherry Solanaceae Forb/herb NY (E), OH (E), PA (E) didymocarpa var. didymocarpa common twinpod Brassicaceae Forb/herb WA (S) Physocarpus opulifolius common ninebark Rosaceae Shrub FL (E) Physocarpus opulifolius var. intermedius Atlantic ninebark Rosaceae Shrub NY (E) Physostegia godfreyi Godfrey's false dragonhead Lamiaceae Forb/herb FL (T) Physostegia leptophylla slenderleaf false dragonhead Lamiaceae Forb/herb GA (T) Physostegia virginiana obedient plant Lamiaceae Forb/herb RI (SC), VT (T) Picea engelmannii Engelmann spruce Pinaceae Tree NV (CY) Picea mariana black spruce Pinaceae Tree RI (SC) Picea rubens red spruce Pinaceae Tree CT (SC), NJ (E) Picramnia pentandra Florida bitterbush Simaroubaceae Tree, Shrub FL (E) Pieris floribunda mountain fetterbush Ericaceae Shrub TN (T) Pilosocereus polygonus Deering's tree cactus Cactaceae Tree FL () Cereus robinii FL (E) Pilosocereus bahamensis FL (E) Pilularia americana American pillwort Marsileaceae Forb/herb TN (SC), WA (S) Pinckneya bracteata fevertree Rubiaceae Tree, Shrub FL (T) Pinguicula caerulea blueflower butterwort Lentibulariaceae Forb/herb FL (T) Pinguicula ionantha violet butterwort Lentibulariaceae Forb/herb Threatened FL (E) Pinguicula lutea yellow butterwort Lentibulariaceae Forb/herb FL (T) Pinguicula planifolia Chapman's butterwort Lentibulariaceae Forb/herb FL (T) Pinguicula primuliflora southern butterwort Lentibulariaceae Forb/herb FL (E), GA (T) Pinguicula vulgaris common butterwort Lentibulariaceae Forb/herb ME (T), NH (E), NY (T), WI (E) Pinus albicaulis whitebark pine Pinaceae Tree NV (CY) Pinus aristata bristlecone pine Pinaceae Tree AZ (SR) Pinus banksiana jack pine Pinaceae Tree IL (E), IN (R), NH (T), NY (R), VT (T) Pinus contorta var. murrayana Sierra lodgepole pine Pinaceae Tree NV (CY) Pinus echinata shortleaf pine Pinaceae Tree IL (E) Pinus flexilis limber pine Pinaceae Tree NV (CY) Jeffrey pine Pinaceae Tree NV (CY) Pinus lambertiana sugar pine Pinaceae Tree NV (CY) Pinus longaeva bristlecone pine Pinaceae Tree NV (CY) Pinus monophylla singleleaf pinyon Pinaceae Tree NV (CY) Pinus monticola western white pine Pinaceae Tree NV (CY) var. ponderosa ponderosa pine Pinaceae Tree NV (CY) Pinus ponderosa var. scopulorum ponderosa pine Pinaceae Tree NV (CY) Pinus ponderosa var. washoensis Washoe pine Pinaceae Tree Pinus washoensis NV (CY) Pinus pungens Table Mountain pine Pinaceae Tree NJ (E) Pinus resinosa red pine Pinaceae Tree CT (E), IL (E), NJ (E) eastern white pine Pinaceae Tree IN (R) Virginia pine Pinaceae Tree NY (E) Piptatheropsis canadensis Canadian ricegrass Poaceae Graminoid Oryzopsis canadensis ME (SC), MI (T), NH (E), NY (E) Piptatheropsis pungens mountain ricegrass Poaceae Graminoid Oryzopsis pungens CT (SC), IA (E), IN (X), NJ (E), PA (E), RI (SC), VT (T) Piptochaetium avenaceum blackseed speargrass Poaceae Graminoid OH (PRX), PA (X) Stipa avenacea IN (T) Pisonia rotundata smooth devil's-claws Nyctaginaceae Tree, Shrub FL (E) Pithecellobium keyense Florida Keys blackbead Fabaceae Tree, Shrub FL (T) falcata sickleleaf silkgrass Asteraceae Forb/herb CT (), RI () Chrysopsis falcata CT (E), RI (SC) Pityopsis flexuosa zigzag silkgrass Asteraceae Forb/herb FL (E) Pityopsis graminifolia var. graminifolia narrowleaf silkgrass Asteraceae Forb/herb OH () Chrysopsis graminifolia OH (E) Pityopsis pinifolia Taylor County goldaster Asteraceae Forb/herb GA (T) Ruth's goldaster Asteraceae Forb/herb Endangered TN (E) Pityopus californica California pinefoot Monotropaceae Forb/herb WA (S) Plagiobothrys hirtus rough popcornflower Boraginaceae Forb/herb Endangered OR (E) Plagiobothrys lamprocarpus shinyfruit popcornflower Boraginaceae Forb/herb OR (E) Plagiobothrys strictus Calistoga popcornflower Boraginaceae Forb/herb Endangered CA (T) Plagiobothrys torreyi var. diffusus Torrey's popcornflower Boraginaceae Forb/herb CA () Plagiobothrys diffusus CA (E) Planera aquatica planertree Ulmaceae Tree IL (T) Plantago cordata heartleaf plantain Plantaginaceae Forb/herb AR (T), IL (E), IN (E), KY (H), MD (E, X), MI (E), NC (E), NY (T), OH (T), TN (E), WI (E) Plantago elongata prairie plantain Plantaginaceae Forb/herb MN (T) Plantago macrocarpa seashore plantain Plantaginaceae Forb/herb WA (S) Plantago maritima var. juncoides goose tongue Plantaginaceae Forb/herb NY () Plantago maritima ssp. juncoides NY (T) Plantago patagonica woolly plantain Plantaginaceae Forb/herb OH (E) Plantago pusilla dwarf plantain Plantaginaceae Forb/herb MD (E, X), NJ (E) Plantago sparsiflora pineland plantain Plantaginaceae Forb/herb NC (E) Plantago virginica Virginia plantain Plantaginaceae Forb/herb CT (SC) Platanthera aquilonis northern green orchid Orchidaceae Forb/herb NY (EV) Platanthera blephariglottis white fringed orchid Orchidaceae Forb/herb CT (E), FL (T), MD (T), NY (EV), OH (E), RI (T) Platanthera chorisiana Chimissso's orchid Orchidaceae Forb/herb WA (T) Platanthera ciliaris yellow fringed orchid Orchidaceae Forb/herb CT (T), FL (T), IL (E), IN (E), MD (T), MI (T), NY (E), OH (T), PA (T), RI (E) Platanthera clavellata small green wood orchid Orchidaceae Forb/herb FL (E), IL (E), IN (WL), NY (EV) Platanthera cristata crested yellow orchid Orchidaceae Forb/herb FL (T), KY (T), MA (E), MD (T), NY (E), PA (X) Platanthera dilatata scentbottle Orchidaceae Forb/herb CT (SC), IN (E), MA (T), NY (EV), PA (E) Platanthera flava palegreen orchid Orchidaceae Forb/herb AR (T), CT (SC), FL (T), IA (E), ME (SC), NY (EV), VT (T) Platanthera flava var. flava palegreen orchid Orchidaceae Forb/herb IL (E), IN (E), NJ (E), TN (SC) Platanthera flava var. herbiola palegreen orchid Orchidaceae Forb/herb IL (E), MA (T), MN (E), NH (T), RI (E), TN (T), WI (T) Platanthera gracilis lax-flowered green orchid Orchidaceae Forb/herb AZ () Platanthera hyperborea var. gracilis AZ (SR) Platanthera grandiflora greater purple fringed orchid Orchidaceae Forb/herb MD (T), NY (EV), OH (PRX), TN (E) Platanthera hookeri Hooker's orchid Orchidaceae Forb/herb CT (SC), IA (T), IN (X), NJ (E), NY (E), OH (PRX), PA (E), RI (H), VT (T) Platanthera huronensis Huron green orchid Orchidaceae Forb/herb NY (EV) Platanthera integra yellow fringeless orchid Orchidaceae Forb/herb FL (E), NC (T), NJ (E), TN (E) Platanthera integrilabia white fringeless orchid Orchidaceae Forb/herb GA (T), KY (T), NC (E), TN (E) Platanthera lacera green fringed orchid Orchidaceae Forb/herb NY (EV) Platanthera leucophaea prairie white fringed orchid Orchidaceae Forb/herb Threatened IA (E), IL (E), IN (X), ME (E), MI (E), MO (E), NY (E), OH (T), PA (X), WI (E) Platanthera limosa Thurber's bog orchid Orchidaceae Forb/herb AZ (SR) Platanthera macrophylla greater roundleaved orchid Orchidaceae Forb/herb RI () Platanthera orbiculata var. macrophylla RI (T) Platanthera nivea snowy orchid Orchidaceae Forb/herb AR (E), FL (T), NC (T), NJ (E), TN (E) Platanthera obtusata bluntleaved orchid Orchidaceae Forb/herb NY (EV), WA (S) Platanthera orbiculata lesser roundleaved orchid Orchidaceae Forb/herb CT (SC), IN (X), NJ (E), NY (EV), RI (T), TN (T) Platanthera peramoena purple fringeless orchid Orchidaceae Forb/herb AR (T), MD (T), NJ (E), PA (T) Platanthera praeclara Great Plains white fringed orchid Orchidaceae Forb/herb Threatened IA (T), MN (E), MO (E), NE (T) Platanthera psycodes lesser purple fringed orchid Orchidaceae Forb/herb IA (T), IL (E), IN (R), KY (E), MD (E, X), NY (EV), OH (E), RI (SC), TN (T) Platanthera sparsiflora sparse-flowered bog orchid Orchidaceae Forb/herb WA (S) Platanthera sparsiflora var. ensifolia sparse-flowered bog orchid Orchidaceae Forb/herb AZ (SR) Platanthera sparsiflora var. sparsiflora sparse-flowered bog orchid Orchidaceae Forb/herb AZ (SR) Platanthera stricta slender bog orchid Orchidaceae Forb/herb AZ (SR) occidentalis American sycamore Platanaceae Tree ME (PX) Pleopeltis astrolepis starscale fern Polypodiaceae Forb/herb FL (E) Pleuropogon hooverianus North Coast semaphoregrass Poaceae Graminoid CA (R) Pleuropogon oregonus Oregon semaphoregrass Poaceae Graminoid OR (T) Pleurothallis gelida flor de llanten Orchidaceae Forb/herb FL (E) Pluchea camphorata camphor pluchea Asteraceae Forb/herb MD (E), OH (E) Pluchea foetida stinking camphorweed Asteraceae Forb/herb NJ (E) Pluchea odorata sweetscent Asteraceae Subshrub, PA (E) Forb/herb Poa alpina alpine bluegrass Poaceae Graminoid MI (T) Poa alsodes grove bluegrass Poaceae Graminoid IL (E), IN (R) Poa autumnalis autumn bluegrass Poaceae Graminoid NJ (E), PA (E) Poa cuspidata early bluegrass Poaceae Graminoid IN (X), NY (E) Poa glauca glaucous bluegrass Poaceae Graminoid ME (SC), NH (T), NY (E) Poa laxa ssp. fernaldiana Fernald's bluegrass Poaceae Graminoid ME (), NH (), NY () Poa fernaldiana ME (E), NH (E), NY (E) Poa laxiflora looseflower bluegrass Poaceae Graminoid WA (T) Poa napensis Napa bluegrass Poaceae Graminoid Endangered CA (E) Poa nemoralis ssp. interior inland bluegrass Poaceae Graminoid NY () Poa interior NY (E) Poa nervosa Wheeler bluegrass Poaceae Graminoid WA (S) Poa paludigena bog bluegrass Poaceae Graminoid IN (WL), MI (T), MN (T), NC (E), NY (E), OH (T), PA (T), WI (T) Poa palustris fowl bluegrass Poaceae Graminoid TN (E) Poa pratensis ssp. alpigena Kentucky bluegrass Poaceae Graminoid NH (E) Poa saltuensis oldpasture bluegrass Poaceae Graminoid KY (E), MD (E), NJ (E), OH (E), TN (SC) Poa languida IL (E), MA (E), PA (T), RI (SC), TN (T) Sandberg bluegrass Poaceae Graminoid MI () Poa canbyi MI (E) Poa sylvestris woodland bluegrass Poaceae Graminoid NY (E) Poa unilateralis San Francisco bluegrass Poaceae Graminoid WA (T) Poa wolfii Wolf's bluegrass Poaceae Graminoid IL (E), IN (R), OH (E) Podophyllum peltatum mayapple Berberidaceae Forb/herb FL (E) Podostemum ceratophyllum hornleaf riverweed Podostemaceae Forb/herb CT (SC), KY (SC), MA (SC), ME (SC), NY (T), OH (E), RI (H) Pogogyne abramsii San Diego mesamint Lamiaceae Forb/herb Endangered CA (E) Pogogyne clareana Santa Lucia mint Lamiaceae Forb/herb CA (E) Pogogyne nudiuscula Otay mesamint Lamiaceae Forb/herb Endangered CA (E) Pogonia ophioglossoides snakemouth orchid Orchidaceae Forb/herb AR (T), FL (T), IL (E), KY (E), NY (EV), OH (T), TN (E) Polanisia dodecandra redwhisker clammyweed Capparaceae Forb/herb CT (SC), MD (E) Polanisia jamesii James' clammyweed Capparaceae Forb/herb IA (E), IL (E) Cristatella jamesii MN (E) Polemonium carneum royal Jacob's-ladder Polemoniaceae Subshrub, WA (T) Forb/herb Polemonium occidentale ssp. lacustre western polemonium Polemoniaceae Forb/herb MN (E), WI (E) Polemonium pectinatum Washington Jacob's-ladder Polemoniaceae Forb/herb WA (T) Polemonium reptans Greek valerian Polemoniaceae Subshrub, MI (T), NJ (E) Forb/herb Polemonium vanbruntiae Vanbrunt's polemonium Polemoniaceae Forb/herb MD (T), ME (E), NY (R), PA (E), VT (T) Polemonium viscosum sticky polemonium Polemoniaceae Forb/herb WA (S) Polyctenium williamsiae Washoe combleaf Brassicaceae Forb/herb NV (FP) Polygala boykinii Boykin's milkwort Polygalaceae Forb/herb TN (SC) Polygala cruciata drumheads Polygalaceae Forb/herb CT (SC), IA (E), KY (E), MD (T), ME (PX), MN (E), OH (E), PA (E), RI (SC) Polygala curtissii Curtiss' milkwort Polygalaceae Forb/herb OH (E), PA (E) Polygala incarnata procession flower Polygalaceae Forb/herb IA (T), IL (E), IN (E), MI (PREX), NJ (E), OH (T), PA (E), WI (E) Polygala lewtonii Lewton's milkwort Polygalaceae Forb/herb Endangered FL (E) Polygala lutea orange milkwort Polygalaceae Forb/herb NY (E), PA (X) Polygala mariana Maryland milkwort Polygalaceae Forb/herb TN (SC) Polygala nana candyroot Polygalaceae Forb/herb TN (E) Polygala nuttallii Nuttall's milkwort Polygalaceae Forb/herb CT (E), KY (H), TN (E) Polygala paucifolia gaywings Polygalaceae Forb/herb IN (E), KY (E), OH (E) Polygala polygama racemed milkwort Polygalaceae Forb/herb IA (E), KY (T), MD (T), OH (T), PA (E) Polygala rimulicola var. mescalerorum Mescalero milkwort Polygalaceae Subshrub, NM (E) Forb/herb Polygala senega Seneca snakeroot Polygalaceae Forb/herb CT (E), MD (T), ME (E), NJ (E) Polygala smallii tiny milkwort Polygalaceae Forb/herb Endangered FL (E) Polygala verticillata whorled milkwort Polygalaceae Forb/herb RI (SC) Polygonatum biflorum var. commutatum smooth Solomon's seal Liliaceae Forb/herb NH (E) Polygonatum biflorum var. melleum smooth Solomon's seal Liliaceae Forb/herb MI (PREX) Polygonatum cobrense McKittrick's Solomon's seal Liliaceae Forb/herb AZ (SR) Polygonatum pubescens hairy Solomon's seal Liliaceae Forb/herb IL (E) Polygonella americana southern jointweed Polygonaceae Subshrub TN (E) Polygonella articulata coastal jointweed Polygonaceae Subshrub, IA (E), IN (R), Forb/herb PA (E) Polygonella basiramia Florida jointweed Polygonaceae Subshrub, Endangered FL (E) Forb/herb Polygonella macrophylla largeleaf jointweed Polygonaceae Subshrub FL (T) Polygonella myriophylla Small's jointweed Polygonaceae Subshrub, Endangered FL (E) Forb/herb Polygonum arifolium halberdleaf tearthumb Polygonaceae Vine, Forb/herb IL (E), TN (T) Polygonum buxiforme box knotweed Polygonaceae Forb/herb NY (E) Polygonum careyi Carey's smartweed Polygonaceae Forb/herb IL (E), IN (T), MI (T), NY (T), OH (PRX), PA (E) Polygonum cilinode fringed black bindweed Polygonaceae Vine, Forb/herb IN (E), OH (E), TN (T) Polygonum douglasii Douglas' knotweed Polygonaceae Forb/herb IA (E), ME (T), NH (T), NY (T), VT (E) Polygonum douglasii ssp. austiniae Austin knotweed Polygonaceae Forb/herb WA () Polygonum austiniae WA (S) Polygonum erectum erect knotweed Polygonaceae Forb/herb NH (E), NY (E) Polygonum glabrum denseflower knotweed Polygonaceae Forb/herb MD (), NJ () Polygonum densiflorum MD (E), NJ (E) Polygonum glaucum seaside knotweed Polygonaceae Subshrub, CT (SC), MA (SC), Forb/herb MD (E), NJ (E), NY (R), RI (T) Polygonum hydropiperoides swamp smartweed Polygonaceae Forb/herb IN (), NY () Polygonum hydropiperoides var. opelousanum IN (T), NY (T) Polygonum meisnerianum branched tearthumb Polygonaceae Forb/herb FL (E) Polygonum ramosissimum bushy knotweed Polygonaceae Forb/herb MD (E, X), PA (X) Polygonum ramosissimum var. prolificum bushy knotweed Polygonaceae Forb/herb NH () Polygonum prolificum NH (T) Polygonum ramosissimum var. ramosissimum bushy knotweed Polygonaceae Forb/herb NH () Polygonum exsertum NH (T) Polygonum robustius stout smartweed Polygonaceae Forb/herb MD (E, X), NH (T), OH (T) Polygonum setaceum bog smartweed Polygonaceae Forb/herb IN (), MA (), NY (), OH (), PA (), RI () Persicaria setacea MA (T) Polygonum hydropiperoides var. setaceum IN (E), RI (H) Polygonum setaceum var. interjectum NY (E), OH (E), PA (E) Polygonum tenue pleatleaf knotweed Polygonaceae Forb/herb ME (PX), NH (E), NY (R) Polygonum viviparum alpine bistort Polygonaceae Forb/herb ME (E), MI (T), NH (T) Polymnia canadensis whiteflower leafcup Asteraceae Forb/herb CT (E), VT (E) Polymnia laevigata Tennessee leafcup Asteraceae Forb/herb FL (E), KY (E) Polypodium virginianum rock polypody Polypodiaceae Forb/herb NY (EV) Polystachya concreta greater yellowspike orchid Orchidaceae Forb/herb FL (E) Polystichum acrostichoides Christmas fern Dryopteridaceae Forb/herb MN (T), NY (EV) Polystichum braunii Braun's hollyfern Dryopteridaceae Forb/herb MA (E), MN (E), NY (EV), PA (E), WI (T) Polystichum californicum California swordfern Dryopteridaceae Forb/herb WA (S) Polystichum lonchitis northern hollyfern Dryopteridaceae Forb/herb NY (E) Polytaenia nuttallii Nuttall's prairie parsley Apiaceae Forb/herb IN (E), MI (PREX), TN (T), WI (T) Pontederia cordata pickerelweed Pontederiaceae Forb/herb KY (T) Ponthieva brittoniae Britton's shadow witch Orchidaceae Forb/herb FL (E) Ponthieva racemosa hairy shadow witch Orchidaceae Forb/herb TN (E) balsamifera balsam poplar Salicaceae Tree IL (E), IN (X), OH (E), PA (E) Populus grandidentata bigtooth aspen Salicaceae Tree TN (SC) Populus heterophylla swamp cottonwood Salicaceae Tree CT (E), MA (E), MI (E), NY (T), PA (X), RI (T) Portulaca smallii Small's purslane Portulacaceae Forb/herb NC (T) Potamogeton alpinus alpine pondweed Potamogetonaceae Forb/herb NH (T), NJ (E), NY (T), PA (X) Potamogeton amplifolius largeleaf pondweed Potamogetonaceae Forb/herb MD (E, X), TN (T) Potamogeton bicupulatus snailseed pondweed Potamogetonaceae Forb/herb IN (X), MI (T), MN (E) Potamogeton clystocarpus little aguja pondweed Potamogetonaceae Forb/herb Endangered TX (E) Potamogeton confervoides Tuckerman's pondweed Potamogetonaceae Forb/herb CT (SC), MA (T), ME (SC), NY (T), PA (T), RI (H), WI (T) Potamogeton diversifolius waterthread pondweed Potamogetonaceae Forb/herb CT (SC), MA (E), MN (E), NY (E) Potamogeton epihydrus ribbonleaf pondweed Potamogetonaceae Forb/herb IN (E), TN (SC) Potamogeton floridanus Florida pondweed Potamogetonaceae Forb/herb FL (E) Potamogeton foliosus leafy pondweed Potamogetonaceae Forb/herb MD (E), NH (E) Potamogeton friesii Fries' pondweed Potamogetonaceae Forb/herb CT (SC), IN (E), MA (E), ME (E), OH (E), PA (E) Potamogeton gramineus variableleaf pondweed Potamogetonaceae Forb/herb IL (T), OH (E), PA (E) Potamogeton hillii Hill's pondweed Potamogetonaceae Forb/herb CT (E), MA (SC), MI (T), NY (T), OH (E), PA (E) Potamogeton illinoensis Illinois pondweed Potamogetonaceae Forb/herb KY (SC), NJ (E), PA (R) Potamogeton oakesianus Oakes' pondweed Potamogetonaceae Forb/herb IN (E), PA (E) Potamogeton obtusifolius bluntleaf pondweed Potamogetonaceae Forb/herb NJ (E), PA (E), WA (S) Potamogeton ogdenii Ogden's pondweed Potamogetonaceae Forb/herb MA (E), NY (E) Potamogeton perfoliatus claspingleaf pondweed Potamogetonaceae Forb/herb OH (PRX) Potamogeton praelongus whitestem pondweed Potamogetonaceae Forb/herb IL (E), IN (E), NJ (E), OH (E), PA (E) Potamogeton pulcher spotted pondweed Potamogetonaceae Forb/herb IL (E), IN (E), KY (T), ME (T), MI (T), NY (T), OH (T), PA (E), WI (E) Potamogeton pusillus small pondweed Potamogetonaceae Forb/herb IN (R) Potamogeton pusillus ssp. gemmiparus small pondweed Potamogetonaceae Forb/herb CT (), NH (), RI () Potamogeton pusillus var. gemmiparus CT (SC), NH (T), RI (SC) Potamogeton richardsonii Richardson's pondweed Potamogetonaceae Forb/herb IN (T), MD (E, X), PA (T) Potamogeton robbinsii Robbins' pondweed Potamogetonaceae Forb/herb IL (E), IN (T), MD (E, X), NJ (E), OH (E), PA (R) Potamogeton spirillus spiral pondweed Potamogetonaceae Forb/herb OH (PRX) Potamogeton strictifolius narrowleaf pondweed Potamogetonaceae Forb/herb CT (SC), IL (E), IN (E), MA (E), ME (PX), NY (E), OH (PRX), PA (E) Potamogeton tennesseensis Tennessee pondweed Potamogetonaceae Forb/herb OH (E), PA (E), TN (T) Potamogeton vaseyi Vasey's pondweed Potamogetonaceae Forb/herb CT (SC), IN (E), MA (E), ME (T), MI (T), NH (T), OH (PRX), PA (E)

Potamogeton zosteriformis flatstem pondweed Potamogetonaceae Forb/herb MD (E), NH (T), NJ (E), PA (R) Potentilla arguta tall cinquefoil Rosaceae Subshrub, AR (T), CT (SC), Forb/herb OH (E) Potentilla bipinnatifida tansy cinquefoil Rosaceae Forb/herb VT () Potentilla pensylvanica var. bipinnatifida VT (E) Potentilla diversifolia var. perdissecta mountainmeadow cinquefoil Rosaceae Forb/herb WA (S) Potentilla drummondii ssp. breweri Drummond's cinquefoil Rosaceae Forb/herb WA () Potentilla breweri WA (S) Hickman's cinquefoil Rosaceae Forb/herb Endangered CA (E) Potentilla nivea snow cinquefoil Rosaceae Subshrub, WA (S) Forb/herb Potentilla nivea var. pentaphylla fiveleaf cinquefoil Rosaceae Subshrub, WA () Forb/herb Potentilla quinquefolia WA (S) Potentilla paradoxa Paradox cinquefoil Rosaceae Forb/herb MI (T), NY (E), OH (T), PA (E) Potentilla pensylvanica Pennsylvania cinquefoil Rosaceae Forb/herb IA (T), MI (T) Potentilla rivalis brook cinquefoil Rosaceae Forb/herb IL () Potentilla millegrana IL (E) Potentilla robbinsiana dwarf mountain cinquefoil Rosaceae Forb/herb NH (E) Prenanthes alba white rattlesnakeroot Asteraceae Forb/herb KY (E) Prenanthes aspera rough rattlesnakeroot Asteraceae Forb/herb IN (R), KY (E), OH (E), TN (E), WI (E) Prenanthes autumnalis slender rattlesnakeroot Asteraceae Forb/herb MD (E) Prenanthes barbata barbed rattlesnakeroot Asteraceae Forb/herb KY (E), TN (SC) Prenanthes boottii alpine rattlesnakeroot Asteraceae Forb/herb ME (E), NH (T), NY (E), VT (E) Prenanthes crepidinea nodding rattlesnakeroot Asteraceae Forb/herb IN (R), KY (T), NY (E), OH (T), PA (E), TN (E), WI (E) Prenanthes ×mainensis rattlesnakeroot Asteraceae Forb/herb ME (PX) Prenanthes nana dwarf rattlesnakeroot Asteraceae Forb/herb ME (E), NY (E) Prenanthes racemosa purple rattlesnakeroot Asteraceae Forb/herb ME (SC), NJ (E), PA (X) Prenanthes roanensis Roan Mountain rattlesnakeroot Asteraceae Forb/herb TN (T) Prenanthes serpentaria cankerweed Asteraceae Forb/herb RI (SC) Nabalus serpentarius MA (E) Prenanthes trifoliolata gall of the earth Asteraceae Forb/herb OH (E) Prescotia oligantha small Prescott orchid Orchidaceae Forb/herb FL (E) Primula laurentiana birdeye primrose Primulaceae Forb/herb ME (SC) Primula mistassinica Mistassini primrose Primulaceae Forb/herb IL (E), ME (SC), NY (T), VT (T) Primula rusbyi Rusby's primrose Primulaceae Forb/herb AZ (SR) Primula specuicola cavedwelling primrose Primulaceae Forb/herb AZ (SR) Primula hunnewellii AZ (SR) Proboscidea louisianica ram's horn Pedaliaceae Forb/herb IN (X) Prosartes hookeri var. hookeri drops-of-gold Liliaceae Forb/herb MI () Disporum hookeri MI (E) Prosartes maculata yellow mandarin Liliaceae Forb/herb KY (), MI (), OH () Disporum maculatum KY (SC), MI (PREX), OH (T) Prosartes trachycarpa roughfruit fairybells Liliaceae Forb/herb AZ (), MI () Disporum trachycarpum AZ (SR), MI (T) Disporum trachycarpum var. subglabrum AZ (SR) Proserpinaca pectinata combleaf mermaidweed Haloragaceae Forb/herb ME (SC), MI (E), NH (E), NY (T), PA (X), RI (SC) Prosopis glandulosa var. glandulosa honey mesquite Fabaceae Tree, Shrub AZ (HR, SA) Prosopis glandulosa var. torreyana western honey mesquite Fabaceae Tree, Shrub AZ (HR, SA) Prosopis pubescens screwbean mesquite Fabaceae Tree, Shrub AZ (HR, SA) Prosopis velutina velvet mesquite Fabaceae Tree, Shrub AZ (HR, SA) Prosthechea boothiana var. erythronioides dollar orchid Orchidaceae Forb/herb FL () Encyclia boothiana FL (E) Prosthechea pygmaea dwarf butterfly orchid Orchidaceae Forb/herb FL () Encyclia pygmaea FL (E) Prunus alleghaniensis Allegheny plum Rosaceae Tree, Shrub CT (SC), MD (T), NJ (E), PA (T) Prunus americana American plum Rosaceae Tree, Shrub NH (T), VT (T) Prunus angustifolia Chickasaw plum Rosaceae Tree, Shrub NJ (E) Prunus geniculata scrub plum Rosaceae Shrub Endangered FL (E) Prunus maritima beach plum Rosaceae Shrub MD (E), ME (E), PA (E) Prunus maritima var. gravesii Graves' plum Rosaceae Shrub CT (E) Prunus mexicana Mexican plum Rosaceae Tree, Shrub OH (PRX) Prunus myrtifolia West Indian cherry Rosaceae Tree, Shrub FL (T) Prunus nigra Canadian plum Rosaceae Tree IA (E), OH (PRX) Prunus pensylvanica pin cherry Rosaceae Tree, Shrub IN (R) Prunus pumila sandcherry Rosaceae Shrub AR (T), PA (R), TN (T) Prunus pumila var. depressa eastern sandcherry Rosaceae Shrub MA (T), NY (T) Prunus pumila var. pumila Great Lakes sandcherry Rosaceae Shrub NY (E), OH (PRX) Prunus susquehanae Sesquehana sandcherry Rosaceae Shrub OH (), RI () Prunus pumila var. cuneata OH (T), RI (SC) Prunus virginiana chokecherry Rosaceae Tree, Shrub TN (SC) Pseudobahia bahiifolia Hartweg's golden sunburst Asteraceae Forb/herb Endangered CA (E) Pseudobahia peirsonii San Joaquin adobe sunburst Asteraceae Forb/herb Threatened CA (E) Pseudognaphalium helleri Heller's cudweed Asteraceae Forb/herb ME (SC) Pseudognaphalium helleri ssp. helleri Heller's cudweed Asteraceae Forb/herb NJ (), TN () Gnaphalium helleri NJ (E), TN (SC) Pseudognaphalium helleri ssp. micradenium Heller's cudweed Asteraceae Forb/herb KY (), NY () Gnaphalium helleri var. micradenium KY (H), NY (E) Pseudognaphalium macounii Macoun's cudweed Asteraceae Forb/herb IN (), NJ () Gnaphalium macounii IN (X), NJ (E) Pseudognaphalium viscosum winged cudweed Asteraceae Forb/herb OH () Gnaphalium viscosum OH (PRX) Pseudophoenix sargentii Florida cherry palm Arecaceae Tree FL (E) ssp. spicata bluebunch wheatgrass Poaceae Graminoid MI () Agropyron spicatum MI (PREX) Pseudotsuga menziesii var. glauca Rocky Mountain Douglas-fir Pinaceae Tree NV (CY) Pseudotsuga menziesii var. menziesii Douglas-fir Pinaceae Tree NV (CY) Psidium longipes mangroveberry Myrtaceae Tree, Shrub FL (T) Psilotum nudum whisk fern Psilotaceae Forb/herb AZ (HS) Psoralidium tenuiflorum slimflower scurfpea Fabaceae Forb/herb KY (E), MN (E) Psoralea tenuiflora IN (X) Psorothamnus spinosus smoketree Fabaceae Tree, Shrub AZ (SA) Psychotria ligustrifolia Bahama wild coffee Rubiaceae Tree, Shrub FL (E) Ptelea trifoliata common hoptree Rutaceae Tree, Shrub NJ (E), NY (E), PA (T) Pteridium aquilinum var. pseudocaudatum western brackenfern Dennstaedtiaceae Forb/herb IN (X), OH (E) Pteris bahamensis Bahama brake Pteridaceae Forb/herb FL (T) Pteroglossaspis ecristata giant orchid Orchidaceae Forb/herb NC (E) Eulophia ecristata FL (T) Pterospora andromedea woodland pinedrops Monotropaceae Forb/herb MI (T), NY (E), VT (E), WI (E) Ptilimnium capillaceum herbwilliam Apiaceae Forb/herb KY (T), PA (X), RI (SC) Ptilimnium costatum ribbed mock bishopweed Apiaceae Forb/herb KY (SC) Ptilimnium nodosum piedmont mock bishopweed Apiaceae Forb/herb Endangered GA (E), MD (E), NC (E) Ptilimnium nuttallii laceflower Apiaceae Forb/herb IL (E), KY (E) Puccinellia nutkaensis Nootka alkaligrass Poaceae Graminoid WA (S) Puccinellia parishii bog alkaligrass Poaceae Graminoid AZ (HS), NM (E) Puccinellia pumila dwarf alkaligrass Poaceae Graminoid RI (H) patens ssp. multifida cutleaf anemone Ranunculaceae Forb/herb WA () Anemone nuttalliana WA (S) Purshia ×subintegra Arizona cliffrose Rosaceae Shrub Endangered AZ (HS) Pycnanthemum albescens whiteleaf mountainmint Lamiaceae Forb/herb IL (E), KY (E)

Pycnanthemum clinopodioides basil mountainmint Lamiaceae Forb/herb CT (E), MA (E), NJ (E), NY (E) Pycnanthemum floridanum Florida mountainmint Lamiaceae Forb/herb FL (T) Pycnanthemum incanum hoary mountainmint Lamiaceae Forb/herb NH (E), VT (E) Pycnanthemum muticum clustered mountainmint Lamiaceae Forb/herb KY (T), ME (PX), MI (T), NY (T) Pycnanthemum pycnanthemoides southern mountainmint Lamiaceae Forb/herb MD (E, X), PA (E) Pycnanthemum setosum awned mountainmint Lamiaceae Forb/herb MD (T) Pycnanthemum torrei Torrey's mountainmint Lamiaceae Forb/herb CT (E), IL (E), MD (E), NH (E), NJ (E), NY (E), PA (E), TN (SC) Pycnanthemum verticillatum whorled mountainmint Lamiaceae Forb/herb MD (E), TN (E, PX) Pycnanthemum verticillatum var. pilosum whorled mountainmint Lamiaceae Forb/herb NY (E), OH (E) Pycnanthemum pilosum MI (T), PA (X) Pycnanthemum verticillatum var. verticillatum whorled mountainmint Lamiaceae Forb/herb NY (T) Pycnanthemum virginianum Virginia mountainmint Lamiaceae Forb/herb NH (E) Pyrola americana American wintergreen Pyrolaceae Subshrub KY (H), TN (E) Pyrola rotundifolia var. americana IN (R) Pyrola asarifolia liverleaf wintergreen Pyrolaceae Subshrub IA (E), IN (E), ME (SC), NH (E), NY (T), VT (T) Pyrola asarifolia ssp. asarifolia liverleaf wintergreen Pyrolaceae Subshrub MA () Pyrola asarifolia var. purpurea MA (E) Pyrola chlorantha greenflowered wintergreen Pyrolaceae Subshrub NJ (E), OH (E), RI (SC) Pyrola virens IN (X), MD (E, X) Pyrola minor snowline wintergreen Pyrolaceae Subshrub ME (SC), NY (E), VT (E), WI (E) Pyrrocoma liatriformis smallhead goldenweed Asteraceae Forb/herb WA () Haplopappus liatriformis WA (T) Pyrrocoma radiata ray goldenweed Asteraceae Forb/herb OR (E) Pyrularia pubera buffalo nut Santalaceae Shrub PA (R) Pyxidanthera barbulata flowering pixiemoss Diapensiaceae Subshrub, NY (E) Forb/herb Pyxidanthera brevifolia littleleaf pixiemoss Diapensiaceae Subshrub NC () Pyxidanthera barbulata var. brevifolia NC (E) Quercus acerifolia mapleleaf oak Fagaceae Tree AR (T) Quercus arkansana Arkansas oak Fagaceae Tree FL (T) Quercus bicolor swamp white oak Fagaceae Tree ME (T) Quercus coccinea scarlet oak Fagaceae Tree ME (E) Quercus falcata southern red oak Fagaceae Tree OH (T), PA (E) Quercus hinckleyi Hinckley oak Fagaceae Shrub Threatened TX (T) Quercus ilicifolia bear oak Fagaceae Tree, Shrub VT (E) Quercus imbricaria shingle oak Fagaceae Tree NJ (E) Quercus lyrata overcup oak Fagaceae Tree NJ (E) Quercus macrocarpa bur oak Fagaceae Tree, Shrub CT (E), MA (SC) Quercus montana chestnut oak Fagaceae Tree IL (T), ME (T) Quercus muehlenbergii chinquapin oak Fagaceae Tree MA (T) Quercus prinoides IN (E) Quercus nigra water oak Fagaceae Tree NJ (E) Quercus oglethorpensis Oglethorpe oak Fagaceae Tree GA (T) Quercus phellos willow oak Fagaceae Tree IL (T), NY (E), PA (E) Quercus prinoides dwarf chinquapin oak Fagaceae Tree, Shrub RI (SC) Quercus shumardii Shumard's oak Fagaceae Tree, Shrub MD (T), PA (E) Quercus sinuata var. sinuata bastard oak Fagaceae Tree, Shrub AR () Quercus durandii AR (T) Quercus stellata post oak Fagaceae Tree RI (SC) Quercus texana Nuttall oak Fagaceae Tree, Shrub IL () Quercus nuttallii IL (E) Ranunculus allegheniensis Allegheny Mountain buttercup Ranunculaceae Forb/herb NJ (E), RI (SC), VT (T) Ranunculus ambigens waterplantain spearwort Ranunculaceae Forb/herb CT (E), KY (SC), MD (E, X), ME (PX), MI (T), NH (E), RI (SC) Ranunculus cymbalaria alkali buttercup Ranunculaceae Forb/herb CT (E), IL (E), MI (T), NJ (E), NY (E), RI (H), WI (T) Ranunculus fascicularis early buttercup Ranunculaceae Forb/herb MD (E), ME (T), NH (E), NJ (E), PA (E) Ranunculus flabellaris yellow water buttercup Ranunculaceae Forb/herb MD (E), RI (SC), TN (T) Ranunculus flammula greater creeping spearwort Ranunculaceae Forb/herb PA (X) Ranunculus flammula var. filiformis greater creeping spearwort Ranunculaceae Forb/herb CT (SC) Ranunculus reptans NJ (E) Ranunculus gmelinii Gmelin's buttercup Ranunculaceae Forb/herb ME (T) Ranunculus gmelinii var. hookeri WI (E) Ranunculus harveyi Harvey's buttercup Ranunculaceae Forb/herb IN (E) Ranunculus hederaceus ivy buttercup Ranunculaceae Forb/herb MD (E, X), PA (X) Ranunculus hispidus var. hispidus bristly buttercup Ranunculaceae Forb/herb RI (SC) Ranunculus hispidus var. nitidus bristly buttercup Ranunculaceae Forb/herb MD (E, X), NY (E) Ranunculus lapponicus Lapland buttercup Ranunculaceae Forb/herb ME (T), MI (T), WI (E) Ranunculus laxicaulis buttercup Ranunculaceae Forb/herb IN (E) Ranunculus longirostris longbeak buttercup Ranunculaceae Forb/herb PA (T), TN (E) Ranunculus subrigidus CT (SC) Ranunculus macounii Macoun's buttercup Ranunculaceae Forb/herb MI (T) Ranunculus micranthus rock buttercup Ranunculaceae Forb/herb MA (E), NY (T), RI (T) Ranunculus pensylvanicus Pennsylvania buttercup Ranunculaceae Forb/herb CT (SC), MA (T), MD (E, X) Ranunculus populago popular buttercup Ranunculaceae Forb/herb WA (S) Ranunculus pusillus low spearwort Ranunculaceae Forb/herb IN (E), OH (E), PA (E) Ranunculus rhomboideus Labrador buttercup Ranunculaceae Forb/herb IL (T), MI (T) Ranunculus sceleratus cursed buttercup Ranunculaceae Forb/herb CT (SC), RI (SC) Ranunculus trichophyllus threadleaf crowfoot Ranunculaceae Forb/herb MD (E), PA (R) Ranunculus trichophyllus var. trichophyllus threadleaf crowfoot Ranunculaceae Forb/herb RI () Ranunculus trichophyllus var. calvescens RI (T) Ranunculus triternatus obscure buttercup Ranunculaceae Forb/herb OR (), WA () Ranunculus reconditus OR (E), WA (T) Ratibida pinnata pinnate prairie coneflower Asteraceae Forb/herb PA (X) Remirea maritima beachstar Cyperaceae Graminoid FL (E) Reynosia septentrionalis darlingplum Rhamnaceae Tree, Shrub FL (T) Rhamnus alnifolia alderleaf buckthorn Rhamnaceae Shrub IL (E), TN (E) Rhamnus lanceolata lanceleaf buckthorn Rhamnaceae Shrub, Tree PA (E) Rhapidophyllum hystrix needle palm Arecaceae Shrub FL (CE) Rhexia aristosa awnpetal meadowbeauty Melastomataceae Forb/herb NC (T), NJ (E) Rhexia mariana Maryland meadowbeauty Melastomataceae Forb/herb MA (E), PA (E) Rhexia mariana var. interior Maryland meadowbeauty Melastomataceae Forb/herb NJ () Rhexia interior NJ (E) Rhexia mariana var. mariana Maryland meadowbeauty Melastomataceae Forb/herb IN (E), MI (T) Rhexia parviflora white meadowbeauty Melastomataceae Forb/herb FL (E) Rhexia salicifolia panhandle meadowbeauty Melastomataceae Forb/herb FL (T) Rhexia virginica handsome Harry Melastomataceae Forb/herb IA (T), VT (T) Rhipsalis baccifera mistletoe cactus Cactaceae Shrub FL (E) Rhodiola integrifolia ssp. leedyi Leedy's stonecrop Crassulaceae Forb/herb MN (), NY () Sedum integrifolium ssp. leedyi Threatened MN (E), NY (E) Rhodiola rhodantha redpod stonecrop Crassulaceae Forb/herb AZ () Sedum rhodanthum AZ (SR) Rhodiola rosea roseroot stonecrop Crassulaceae Forb/herb NC (), NY (), PA (), TN (), VT () Sedum rosea NC (E), NY (E), PA (E), TN (X), VT (T) Rhododendron alabamense Alabama azalea Ericaceae Shrub FL (E) Rhododendron arborescens smooth azalea Ericaceae Shrub NY (EV) Rhododendron atlanticum dwarf azalea Ericaceae Shrub NJ (E), PA (E) Rhododendron austrinum orange azalea Ericaceae Shrub FL (E) Rhododendron calendulaceum flame azalea Ericaceae Shrub OH (E), PA (X) Rhododendron canadense rhodora Ericaceae Shrub NJ (E), NY (T) Rhododendron canescens mountain azalea Ericaceae Shrub FL (CE), KY (E) Rhododendron chapmanii Chapman's rhododendron Ericaceae Shrub Endangered FL (E) Rhododendron lapponicum Lapland rosebay Ericaceae Shrub ME (T), NY (E), WI (E) great laurel Ericaceae Tree, Shrub MA (T), ME (T), NY (EV), OH (T), VT (T) Rhododendron periclymenoides pink azalea Ericaceae Shrub NY (EV), RI (SC) Rhododendron nudiflorum NH (E), OH (T) Rhododendron prinophyllum early azalea Ericaceae Shrub NY (EV) Rhododendron prunifolium plumleaf azalea Ericaceae Shrub GA (T) Rhododendron viscosum swamp azalea Ericaceae Shrub ME (E), NH (T), NY (EV) Rhus aromatica fragrant sumac Anacardiaceae Shrub CT (SC) Rhus aromatica var. arenaria fragrant sumac Anacardiaceae Shrub IN (T), OH (PRX) Rhus kearneyi Kearney's sumac Anacardiaceae Tree, Shrub AZ (SR) Rhus michauxii false poison sumac Anacardiaceae Subshrub, Shrub Endangered FL (E), GA (E), NC (E, SC) Rhynchosia latifolia prairie snoutbean Fabaceae Vine, Forb/herb TN (E, PX) Rhynchosia parvifolia small-leaf snoutbean Fabaceae Vine, Forb/herb FL (T) Rhynchosia swartzii Swartz's snoutbean Fabaceae Vine, Forb/herb FL (E) Rhynchosia tomentosa twining snoutbean Fabaceae Forb/herb KY (E), MD (T) Rhynchospora alba white beaksedge Cyperaceae Graminoid IL (T), TN (E, PX) Rhynchospora capillacea needle beaksedge Cyperaceae Graminoid CT (E), IA (T), MA (E), ME (T), MN (T), NH (E), NJ (E), PA (E), TN (E, PX), VT (T) Rhynchospora cephalantha bunched beaksedge Cyperaceae Graminoid MD (E) Rhynchospora chalarocephala loosehead beaksedge Cyperaceae Graminoid TN (T) Rhynchospora colorata starrush whitetop Cyperaceae Graminoid AR (E) Rhynchospora corniculata shortbristle horned beaksedge Cyperaceae Graminoid IN () Rhynchospora corniculata var. interior IN (T) Rhynchospora crinipes mosquito beaksedge Cyperaceae Graminoid FL (E), NC (E) Rhynchospora filifolia threadleaf beaksedge Cyperaceae Graminoid NJ (E) Rhynchospora fusca brown beaksedge Cyperaceae Graminoid PA (X) Rhynchospora globularis globe beaksedge Cyperaceae Graminoid KY (SC), MD (E), MI (E), NJ (E), OH (E) Rhynchospora glomerata clustered beaksedge Cyperaceae Graminoid IL (E), MD (T), NJ (E) Rhynchospora gracilenta slender beaksedge Cyperaceae Graminoid PA (X) Rhynchospora inundata narrowfruit horned beaksedge Cyperaceae Graminoid MA (T), MD (E), NY (T), RI (E) Rhynchospora knieskernii Knieskern's beaksedge Cyperaceae Graminoid Threatened NJ (E) Rhynchospora latifolia sandswamp whitetop Cyperaceae Graminoid TN (E, PX) Rhynchospora macra large beaksedge Cyperaceae Graminoid NC (E) Rhynchospora macrostachya tall horned beaksedge Cyperaceae Graminoid CT (T), IN (R), KY (E), ME (E), RI (T) Rhynchospora megaplumosa Manatee beaksedge Cyperaceae Graminoid FL (E) Rhynchospora microcephala smallhead beaksedge Cyperaceae Graminoid NJ (E) Rhynchospora nitens shortbeak beaksedge Cyperaceae Graminoid MA (T), MD (E), NY (T) Psilocarya nitens IN (X) Rhynchospora pallida pale beaksedge Cyperaceae Graminoid MD (E, X) Rhynchospora perplexa pineland beaksedge Cyperaceae Graminoid TN (T) Rhynchospora rariflora fewflower beaksedge Cyperaceae Graminoid AR (T), MD (E, X), NJ (E), TN (E) Rhynchospora recognita globe beaksedge Cyperaceae Graminoid IN () Rhynchospora globularis var. recognita IN (E) Rhynchospora scirpoides longbeak beaksedge Cyperaceae Graminoid CT (E), MA (SC), MD (T), NY (R), RI (E) Psilocarya scirpoides IN (T), MI (T), WI (T) Rhynchospora stenophylla coastal plain beaksedge Cyperaceae Graminoid FL (T) Rhynchospora thornei Thorne's beaksedge Cyperaceae Graminoid NC (E) Rhynchospora torreyana Torrey's beaksedge Cyperaceae Graminoid MA (E), MD (T), NY (E), RI (E) Rhynchospora wrightiana Wright's beaksedge Cyperaceae Graminoid TN (E, PX) Ribes americanum American black currant Grossulariaceae Shrub MD (E, X) Ribes aureum var. villosum golden currant Grossulariaceae Shrub TN () Ribes odoratum TN (T) Ribes cereum var. colubrinum wax currant Grossulariaceae Shrub WA (S) Ribes echinellum Miccosukee gooseberry Grossulariaceae Shrub Threatened FL (E) Ribes glandulosum skunk currant Grossulariaceae Shrub CT (E), NJ (E), OH (PRX) Ribes hirtellum hairystem gooseberry Grossulariaceae Shrub IL (E), RI (SC) Ribes hudsonianum northern black currant Grossulariaceae Shrub IA (T) Ribes lacustre prickly currant Grossulariaceae Shrub CT (SC), MA (SC), PA (E) Ribes missouriense Missouri gooseberry Grossulariaceae Shrub NJ (E), OH (E), PA (E) Ribes oxyacanthoides Canadian gooseberry Grossulariaceae Shrub WI (T) Ribes oxyacanthoides ssp. irriguum Idaho gooseberry Grossulariaceae Shrub WA (S) Ribes rotundifolium Appalachian gooseberry Grossulariaceae Shrub CT (SC) Ribes triste red currant Grossulariaceae Shrub CT (E), OH (E), PA (T) Rorippa columbiae Columbian yellowcress Brassicaceae Forb/herb WA (T) Rorippa subumbellata Lake Tahoe yellowcress Brassicaceae Forb/herb CA (E), NV (FP) Rosa acicularis prickly rose Rosaceae Subshrub IA (E), IL (E), MA (E), NH (E), VT (E) Rosa acicularis ssp. sayi prickly rose Rosaceae Subshrub NY (E) prairie rose Rosaceae Subshrub OH (PRX) Rosa blanda smooth rose Rosaceae Subshrub MD (E), OH (T) Rosa blanda var. glabra smooth rose Rosaceae Subshrub ME (SC) Rosa minutifolia Baja rose Rosaceae Subshrub CA (E) Rosa nitida shining rose Rosaceae Subshrub CT (SC), NY (E) Rosa stellata ssp. abyssa desert rose Rosaceae Subshrub AZ (SR) Rotala ramosior lowland rotala Lythraceae Forb/herb CT (E), MA (E), MN (T), NY (T), PA (R), RI (E), WA (S) Roystonea regia royal palm Arecaceae Tree FL (E) Roystonea elata FL (E) Rubus alumnus oldfield blackberry Rosaceae Subshrub IN (X) Rubus arcticus ssp. acaulis dwarf raspberry Rosaceae Subshrub, MI (), WA () Forb/herb Rubus acaulis MI (E), WA (S) Rubus arenicola sanddwelling dewberry Rosaceae Subshrub ME (PX) Rubus canadensis smooth blackberry Rosaceae Subshrub KY (E), NJ (E) Rubus centralis Illinois dewberry Rosaceae Subshrub IN (E) Rubus chamaemorus cloudberry Rosaceae Subshrub, MN (T), NH (E) Forb/herb Rubus cuneifolius sand blackberry Rosaceae Subshrub CT (SC), NH (E), NY (E), PA (E) Rubus deamii Deam's dewberry Rosaceae Subshrub IN (X) Rubus depavitus Aberdeen dewberry Rosaceae Subshrub IN (X) Rubus flagellaris northern dewberry Rosaceae Subshrub IN () Rubus enslenii IN (E) Posey County blackberry Rosaceae Subshrub IN (X) Rubus impar Rubus nigerrimus dark raspberry Rosaceae Subshrub WA (E) Rubus odoratus purpleflowering raspberry Rosaceae Subshrub IL (E), IN (T) Rubus pubescens dwarf red blackberry Rosaceae Subshrub, IL (T) Forb/herb Rubus setosus setose blackberry Rosaceae Subshrub IL (E), IN (E), OH (PRX) Rubus trivialis southern dewberry Rosaceae Subshrub, Vine OH (PRX) Rubus whartoniae Wharton's dewberry Rosaceae Subshrub KY (T), TN (SC) Rudbeckia fulgida orange coneflower Asteraceae Forb/herb NJ (E) Rudbeckia fulgida var. fulgida orange coneflower Asteraceae Forb/herb IN (R) Rudbeckia fulgida var. umbrosa orange coneflower Asteraceae Forb/herb IN (E) Rudbeckia heliopsidis sunfacing coneflower Asteraceae Forb/herb NC (E) var. hirta blackeyed Susan Asteraceae Forb/herb NY (E) Rudbeckia laciniata cutleaf coneflower Asteraceae Subshrub, RI (T) Forb/herb Rudbeckia missouriensis Missouri orange coneflower Asteraceae Forb/herb IL (E) Rudbeckia nitida shiny coneflower Asteraceae Forb/herb FL (E) Rudbeckia subtomentosa sweet coneflower Asteraceae Forb/herb KY (E), MI (PREX), TN (T) Rudbeckia triloba browneyed Susan Asteraceae Forb/herb FL (E) Ruellia caroliniensis Carolina wild petunia Acanthaceae Forb/herb NJ (E), PA (X) Ruellia humilis fringeleaf wild petunia Acanthaceae Forb/herb MD (E), MI (T), NC (T), PA (E), WI (E) Ruellia noctiflora nightflowering wild petunia Acanthaceae Forb/herb FL (E) Ruellia purshiana Pursh's wild petunia Acanthaceae Forb/herb MD (E), TN (SC) Ruellia strepens limestone wild petunia Acanthaceae Forb/herb MD (E), MI (T), PA (T) Rugelia nudicaulis Rugel's Indianplantain Asteraceae Forb/herb TN (E) Cacalia rugelia NC (T) Rumex altissimus pale dock Polygonaceae Forb/herb MD (E) Rumex aquaticus var. fenestratus western dock Polygonaceae Forb/herb MI () Rumex occidentalis MI (E) Rumex hastatulus heartwing sorrel Polygonaceae Forb/herb NY (E), PA (X) Rumex maritimus golden dock Polygonaceae Forb/herb CT (), NY () Rumex maritimus var. fueginus CT (SC), NY (E) Rumex orthoneurus Chiricahua Mountain dock Polygonaceae Forb/herb AZ (HS) Rumex pallidus seaside dock Polygonaceae Forb/herb MA (T), NH (E) Rumex verticillatus swamp dock Polygonaceae Forb/herb MA (T) Rumex floridanus MD (E) Ruppia maritima widgeongrass Ruppiaceae Forb/herb MI (T) Sabatia angularis rosepink Gentianaceae Forb/herb MI (T), NY (E) Sabatia campanulata slender rose gentian Gentianaceae Forb/herb AR (E), IN (X), KY (E), MA (E), MD (E), NY (E), PA (X) Sabatia campestris Texas star Gentianaceae Forb/herb IL (E) Sabatia capitata Appalachian rose gentian Gentianaceae Forb/herb GA (R), TN (E) Sabatia difformis lanceleaf rose gentian Gentianaceae Forb/herb MD (E) Sabatia dodecandra marsh rose gentian Gentianaceae Forb/herb CT (SC) Sabatia kennedyana Plymouth rose gentian Gentianaceae Forb/herb MA (SC), NC (SC, T), RI (E) Sabatia stellaris rose of Plymouth Gentianaceae Forb/herb CT (E), MA (E), NY (T), RI (T) Saccharum alopecuroides silver plumegrass Poaceae Graminoid OH () Saccharum alopecuroidum OH (PRX) Saccharum brevibarbe var. contortum sortbeard plumegrass Poaceae Graminoid MD () Erianthus contortus MD (T) Saccharum giganteum sugarcane plumegrass Poaceae Graminoid PA () Erianthus giganteus PA (X) Sacciolepis striata American cupscale Poaceae Graminoid MD (E), NJ (E), TN (SC) Sachsia polycephala Bahama sachsia Asteraceae Forb/herb FL () Sachsia bahamensis FL (T) Sageretia minutiflora smallflower mock buckthorn Rhamnaceae Vine, Shrub GA (T) Sagina decumbens trailing pearlwort Caryophyllaceae Forb/herb NY (E), OH (PRX) Sagina nodosa knotted pearlwort Caryophyllaceae Forb/herb MI (T) Sagina nodosa ssp. borealis knotted pearlwort Caryophyllaceae Forb/herb MN (E) Sagittaria australis longbeak arrowhead Alismataceae Forb/herb IN (R), NJ (E) Sagittaria brevirostra shortbeak arrowhead Alismataceae Forb/herb TN (T) Sagittaria calycina hooded arrowhead Alismataceae Forb/herb ME (SC) Sagittaria calycina var. spongiosa hooded arrowhead Alismataceae Forb/herb NY (T), PA (E) Sagittaria montevidensis ssp. spongiosa MA (E) Sagittaria cuneata arumleaf arrowhead Alismataceae Forb/herb CT (SC), MA (T), NH (T), NJ (E), OH (T) Sagittaria engelmanniana Engelmann's arrowhead Alismataceae Forb/herb MD (T) Sagittaria fasciculata bunched arrowhead Alismataceae Forb/herb Endangered NC (E) Sagittaria filiformis threadleaf arrowhead Alismataceae Forb/herb PA () Sagittaria stagnorum PA (X) Sagittaria graminea grassy arrowhead Alismataceae Forb/herb KY (T), OH (E), RI (SC), TN (T) Sagittaria latifolia broadleaf arrowhead Alismataceae Forb/herb IL () Sagittaria longirostra IL (E) Sagittaria platyphylla delta arrowhead Alismataceae Forb/herb KY (T), OH (PRX), TN (SC) Sagittaria rigida sessilefruit arrowhead Alismataceae Forb/herb KY (E), MD (E), ME (T), OH (T), TN (SC) Sagittaria secundifolia Little River arrowhead Alismataceae Forb/herb Threatened GA (T) Sagittaria subulata awl-leaf arrowhead Alismataceae Forb/herb CT (SC), PA (R), RI (H) Sagittaria subulata var. subulata MA (E) Sagittaria teres slender arrowhead Alismataceae Forb/herb MA (SC), NJ (E), NY (E), RI (E) Salicornia bigelovii dwarf saltwort Chenopodiaceae Forb/herb ME (SC), NH (T), NY (T) Salicornia depressa Virginia glasswort Chenopodiaceae Forb/herb, NH () Subshrub Salicornia virginica NH (T) Salicornia maritima slender grasswort Chenopodiaceae Forb/herb ME (PX) Salicornia rubra red swampfire Chenopodiaceae Subshrub, MN (T) Forb/herb Salix amygdaloides peachleaf willow Salicaceae Tree, Shrub KY (H) Salix arctophila northern willow Salicaceae Subshrub, Shrub ME (E) Salix argyrocarpa Labrador willow Salicaceae Shrub ME (E), NH (T) Salix bebbiana Bebb willow Salicaceae Tree, Shrub MD (E, X) Salix candida sageleaf willow Salicaceae Shrub ME (T), OH (T), PA (E), WA (S) Salix caroliniana coastal plain willow Salicaceae Tree OH (T), PA (E) Salix cordata heartleaf willow Salicaceae Shrub NY (E), WI (E) Salix syrticola IL (E) Salix discolor pussy willow Salicaceae Tree, Shrub KY (H) Salix eriocephala Missouri River willow Salicaceae Tree, Shrub FL (E) Salix cordata IN (T) Salix exigua narrowleaf willow Salicaceae Tree, Shrub CT (T), MA (T), MD (E) Salix floridana Florida willow Salicaceae Tree, Shrub FL (E), GA (E) Salix glauca grayleaf willow Salicaceae Tree, Shrub WA (S) Salix herbacea snowbed willow Salicaceae Shrub ME (T), NH (T), NY (E) Salix interior sandbar willow Salicaceae Shrub, Tree ME (E) Salix lucida shining willow Salicaceae Tree, Shrub IA (T), MD (E, X) Salix maccalliana McCalla's willow Salicaceae Tree WA (S) Salix myricoides bayberry willow Salicaceae Tree, Shrub ME (E) Salix pedicellaris bog willow Salicaceae Shrub CT (E), IA (T), NJ (E), OH (E), PA (E), RI (H) Salix pellita satiny willow Salicaceae Tree, Shrub NH (T), WI (E) Salix petiolaris meadow willow Salicaceae Tree, Shrub CT (SC), OH (T), PA (E) Salix planifolia diamondleaf willow Salicaceae Tree, Subshrub, ME (T), MI (T), Shrub NH (T), VT (T), WI (T) Salix pyrifolia balsam willow Salicaceae Tree, Shrub NY (T) Salix sericea silky willow Salicaceae Tree, Shrub AR (E) Salix serissima autumn willow Salicaceae Tree, Shrub CT (SC), IL (E), IN (T), PA (T) Salix sessilifolia northwest sandbar willow Salicaceae Tree, Shrub WA (T) Salix tweedyi Tweedy's willow Salicaceae Shrub WA (S) Salix uva-ursi bearberry willow Salicaceae Shrub ME (T), NY (T), VT (E) Salix vestita rock willow Salicaceae Shrub WA () Salix vestita var. erecta WA (PX) Salvia azurea var. grandiflora pitcher sage Lamiaceae Forb/herb TN (SC) Salvia azurea ssp. pitcheri IL (T) Salvia lyrata lyreleaf sage Lamiaceae Forb/herb NY (E) Salvia urticifolia nettleleaf sage Lamiaceae Forb/herb FL (E), KY (E), MD (E, X) Sambucus racemosa var. racemosa red elderberry Caprifoliaceae Tree, Shrub IL (), KY (), RI () Sambucus pubens IL (E) Sambucus racemosa ssp. pubens KY (E) Sambucus racemosa var. pubens RI (H) Samolus valerandi seaside brookweed Primulaceae Forb/herb ME (SC) Samolus valerandi ssp. parviflorus seaside brookweed Primulaceae Forb/herb NH (), PA (), WA () Samolus parviflorus NH (T), PA (E), WA (S) Sanguinaria canadensis bloodroot Papaveraceae Forb/herb NY (EV), RI (SC) Sanguisorba canadensis Canadian burnet Rosaceae Forb/herb GA (T), IL (E), IN (E), KY (E), MD (T), ME (T), MI (T), RI (E), TN (E) Sanguisorba menziesii Menzies' burnet Rosaceae Forb/herb WA (S) Sanicula arctopoides footsteps of spring Apiaceae Forb/herb WA (S) Sanicula canadensis Canadian blacksnakeroot Apiaceae Forb/herb MA (T), VT (T) Sanicula marilandica Maryland sanicle Apiaceae Forb/herb WA (S) Sanicula maritima adobe snakeroot Apiaceae Forb/herb CA (R) Sanicula odorata clustered blacksnakeroot Apiaceae Forb/herb MA (T) Sanicula gregaria NH (T) Sanicula saxatilis devil's blacksnakeroot Apiaceae Forb/herb CA (R) Sanicula smallii Small's blacksnakeroot Apiaceae Forb/herb IN (R) Sanicula trifoliata largefruit blacksnakeroot Apiaceae Forb/herb NH (T), NJ (E) Sarracenia flava yellow pitcherplant Sarraceniaceae Forb/herb GA (U) Sarracenia leucophylla crimson pitcherplant Sarraceniaceae Forb/herb FL (E), GA (E) Sarracenia minor hooded pitcherplant Sarraceniaceae Forb/herb FL (T), GA (U) Sarracenia oreophila green pitcherplant Sarraceniaceae Forb/herb Endangered GA (E), NC (E, SC), TN (E, PX) Sarracenia psittacina parrot pitcherplant Sarraceniaceae Forb/herb FL (T), GA (T) Sarracenia purpurea purple pitcherplant Sarraceniaceae Forb/herb FL (T), GA (E), IL (E), MD (T), NY (EV) Sarracenia purpurea ssp. purpurea var. purpurea northern purple pitcherplant Sarraceniaceae Forb/herb MI () Sarracenia purpurea ssp. heterophylla MI (T) Sarracenia rubra sweet pitcherplant Sarraceniaceae Forb/herb FL (T), GA (E) Sarracenia rubra ssp. jonesii Jones' pitcherplant Sarraceniaceae Forb/herb Endangered Sarracenia jonesii NC (E, SC) Sassafras albidum sassafras Lauraceae Tree, Shrub ME (SC) Saururus cernuus lizard's tail Saururaceae Forb/herb CT (E), RI (E) Savia bahamensis Bahama maidenbush Euphorbiaceae Tree, Shrub FL (E) Saxifraga aizoides yellow mountain saxifrage Saxifragaceae Forb/herb NY (T) Saxifraga caroliniana Carolina saxifrage Saxifragaceae Forb/herb TN (E) Saxifraga cernua nodding saxifrage Saxifragaceae Forb/herb MN (E), NH (E), WA (S) Saxifraga foliolosa leafystem saxifrage Saxifragaceae Forb/herb ME (E) Saxifraga michauxii Michaux's saxifrage Saxifragaceae Forb/herb KY (T) Saxifraga micranthidifolia lettuceleaf saxifrage Saxifragaceae Forb/herb KY (E), PA (R) Saxifraga oppositifolia purple mountain saxifrage Saxifragaceae Forb/herb NY (E) White Mountain saxifrage Saxifragaceae Forb/herb ME (E), MI (T), MN (T), NY (E) Saxifraga paniculata ssp. neogaea White Mountain saxifrage Saxifragaceae Forb/herb NH () Saxifraga aizoon var. neogaea NH (E) Saxifraga pensylvanica eastern swamp saxifrage Saxifragaceae Forb/herb KY (H), ME (T), RI (SC), TN (E) Saxifraga forbesii IN (E) Saxifraga rivularis weak saxifrage Saxifragaceae Forb/herb NH (E), WA (S) Saxifraga tricuspidata three toothed saxifrage Saxifragaceae Forb/herb MI (T) Saxifraga virginiensis early saxifrage Saxifragaceae Forb/herb IL (E), IN (R), RI (SC) Saxifragopsis fragarioides strawberry saxifrage Saxifragaceae Forb/herb WA (S) Scaevola plumieri gullfeed Goodeniaceae Subshrub, Shrub, FL (T) Forb/herb Schaefferia frutescens Florida boxwood Celastraceae Tree, Shrub FL (E) Scheuchzeria palustris rannoch-rush Scheuchzeriaceae Forb/herb CT (E), MA (E), NJ (E), NY (R), OH (E), PA (E), RI (E) Scheuchzeria palustris ssp. americana rannoch-rush Scheuchzeriaceae Forb/herb IN (E), VT (T) Schiedeella arizonica parasitic lady's tresses Orchidaceae Forb/herb AZ () Spiranthes parasitica AZ (SR) Schisandra glabra bay starvine Schisandraceae Vine GA (T), KY (E), NC (SC, T), TN (T) Schisandra coccinea FL (E) Schizachne purpurascens false melic Poaceae Graminoid CT (SC), IL (E), IN (E), KY (T), MD (E), NJ (E), OH (E) Schizachyrium littorale shore little bluestem Poaceae Graminoid OH (), PA () var. littorale OH (E), PA (R) Schizachyrium niveum pinescrub bluestem Poaceae Graminoid FL (E) Schizaea pusilla little curlygrass fern Schizaeaceae Forb/herb NY (E) Schoenolirion croceum yellow sunnybell Liliaceae Forb/herb FL (E), TN (T) Schoenolirion wrightii Texas sunnybell Liliaceae Forb/herb AR (T) Schoenoplectiella hallii Hall's bulrush Cyperaceae Graminoid Scirpus hallii IL (T), IN (E), KY (E), MI (T), WI (E) Schoenoplectiella purshiana weakstalk bulrush Cyperaceae Graminoid Scirpus purshianus IL (E), IN (E) Schoenoplectiella smithii Smith's bulrush Cyperaceae Graminoid Scirpus smithii IL (E), IN (E), MD (E, X), OH (E), PA (E), RI (T) Schoenoplectus acutus var. acutus hardstem bulrush Cyperaceae Graminoid CT (), PA () Scirpus acutus CT (T), PA (E) Schoenoplectus americanus chairmaker's bulrush Cyperaceae Graminoid MI () Scirpus olneyi MI (T) Schoenoplectus etuberculatus Canby's bulrush Cyperaceae Graminoid MD (), RI () Scirpus etuberculatus MD (E), RI (E) Schoenoplectus heterochaetus slender bulrush Cyperaceae Graminoid KY (), NY (), PA () Scirpus heterochaetus KY (E), NY (E), PA (X) Schoenoplectus ×steinmetzii bulrush Cyperaceae Graminoid ME (T) Schoenoplectus subterminalis swaying bulrush Cyperaceae Graminoid IN (), MD (), OH (), RI (), TN () Scirpus subterminalis IN (R), MD (E), OH (E), RI (SC), TN (SC) Schoenoplectus torreyi Torrey's bulrush Cyperaceae Graminoid NJ (E) Scirpus torreyi CT (T), IN (E), MD (E, X), OH (PRX), PA (E), RI (SC) Schwalbea americana chaffseed Scrophulariaceae Forb/herb Endangered CT (SC), FL (E), GA (E), KY (H), MD (E, X), NC (E), NJ (E), TN (E, PX) Scirpus ancistrochaetus barbedbristle bulrush Cyperaceae Graminoid Endangered MA (E), MD (E), NH (E), PA (T), VA (E), VT (E) Scirpus expansus woodland bulrush Cyperaceae Graminoid IN (E), KY (E), OH (T) Scirpus georgianus Georgia bulrush Cyperaceae Graminoid CT (SC), NY (E) Scirpus hattorianus mosquito bulrush Cyperaceae Graminoid IL (E) Scirpus longii Long's bulrush Cyperaceae Graminoid CT (SC), MA (T), ME (T), NJ (E), RI (E) Scirpus microcarpus panicled bulrush Cyperaceae Graminoid KY (E), NJ (E) Scirpus pedicellatus stalked bulrush Cyperaceae Graminoid NJ (E), PA (T) Scirpus pendulus rufous bulrush Cyperaceae Graminoid ME (E), NH (T) Scirpus polyphyllus leafy bulrush Cyperaceae Graminoid IL (T), NH (E), VT (E) Scleria ciliata var. ciliata fringed nutrush Cyperaceae Graminoid KY (E) Scleria lithosperma Florida Keys nutrush Cyperaceae Graminoid FL (E) Scleria minor slender nutrush Cyperaceae Graminoid MD (E), NY (E), PA (E) Scleria muehlenbergii Muehlenberg's nutrush Cyperaceae Graminoid NY () Scleria reticularis var. pubescens NY (E) Scleria oligantha littlehead nutrush Cyperaceae Graminoid OH (E) Scleria pauciflora fewflower nutrush Cyperaceae Graminoid MA (E), MI (E), OH (T), PA (T), RI (T) Scleria pauciflora var. caroliniana Carolina nutrush Cyperaceae Graminoid CT (E), NY (E) Scleria reticularis netted nutrush Cyperaceae Graminoid CT (E), IN (T), MI (T), PA (E), RI (T), WI (E) Scleria triglomerata whip nutrush Cyperaceae Graminoid CT (E), MA (E), MN (E), NY (T), RI (T) Scleria nitida MD (E) Scleria verticillata low nutrush Cyperaceae Graminoid AR (T), CT (SC), IA (T), MD (E), MN (T), NJ (E), NY (E), PA (E), TN (SC) Sclerocactus mesae-verdae Mesa Verde fishhook cactus Cactaceae Shrub Threatened NM (E) Sclerocactus nyensis Nye County fishhook cactus Cactaceae Shrub NV (CY) Sclerocactus papyracanthus paperspine fishhook cactus Cactaceae Shrub AZ () Pediocactus papyracanthus AZ (SR) Sclerocactus parviflorus smallflower fishhook cactus Cactaceae Shrub AZ (SR) Sclerocactus parviflorus ssp. intermedius intermediate fishhook cactus Cactaceae Shrub AZ () Sclerocactus parviflorus var. intermedius AZ (SR) Sclerocactus parviflorus ssp. parviflorus smallflower fishhook cactus Cactaceae Shrub NM () Sclerocactus cloveriae ssp. brackii NM (E) Sclerocactus polyancistrus redspined fishhook cactus Cactaceae Shrub NV (CY) Sclerocactus pubispinus Great Basin fishhook cactus Cactaceae Shrub AZ (SR), NV (CY) Sclerocactus sileri Siler fishhook cactus Cactaceae Subshrub AZ () Sclerocactus spinosior desert valley fishhook cactus Cactaceae Shrub AZ (SR) Sclerocactus spinosior ssp. blainei Blaine fishhook cactus Cactaceae Shrub NV () Sclerocactus blainei NV (CY) Sclerocactus schlesseri NV (CY) Sclerocactus whipplei Whipple's fishhook cactus Cactaceae Shrub AZ (SR) Sclerolepis uniflora pink bogbutton Asteraceae Forb/herb MA (E), MD (T), NH (E), RI (E) Sclerolinon digynum northwestern yellowflax Linaceae Forb/herb WA (S) Scribneria bolanderi Scribner's grass Poaceae Graminoid WA (S) Scrophularia lanceolata lanceleaf figwort Scrophulariaceae Forb/herb RI (SC) Scrophularia marilandica carpenter's square Scrophulariaceae Subshrub, ME (PX), RI (T) Forb/herb Scutellaria arguta Blue Ridge skullcap Lamiaceae Forb/herb KY (T), TN (E) Scutellaria bushii Bush's skullcap Lamiaceae Forb/herb AR (T) Scutellaria floridana Florida skullcap Lamiaceae Forb/herb Threatened FL (E) Scutellaria havanensis Havana skullcap Lamiaceae Forb/herb FL (E) Scutellaria incana hoary skullcap Lamiaceae Forb/herb MI (PREX), NY (E) Scutellaria integrifolia helmet flower Lamiaceae Forb/herb CT (E), NY (E) Scutellaria montana largeflower skullcap Lamiaceae Forb/herb Threatened GA (E), TN (E) Scutellaria nervosa veiny skullcap Lamiaceae Forb/herb MD (E), MI (T) Scutellaria ocmulgee Ocmulgee skullcap Lamiaceae Forb/herb GA (T) Scutellaria ovata heartleaf skullcap Lamiaceae Forb/herb MI (PREX), MN (T) Scutellaria parvula small skullcap Lamiaceae Forb/herb MD (E, X), ME (PX), MI (T) Scutellaria parvula var. australis small skullcap Lamiaceae Forb/herb IN (R) Scutellaria parvula var. missouriensis Leonard's skullcap Lamiaceae Forb/herb CT (), MD (), NJ () Scutellaria leonardii CT (E), MD (T), NJ (E) Scutellaria parvula var. parvula small skullcap Lamiaceae Forb/herb IN (X), WI (E) Scutellaria saxatilis smooth rock skullcap Lamiaceae Forb/herb IN (E), KY (T), MD (E), PA (E), TN (T) Scutellaria serrata showy skullcap Lamiaceae Forb/herb PA (E)

Sebastiania bilocularis arrow poision plant Euphorbiaceae Shrub, Tree AZ () Sapium biloculare AZ (SR) Sedella leiocarpa Lake County mock stonecrop Crassulaceae Forb/herb CA () Parvisedum leiocarpum Endangered CA (E) Sedum cockerellii Cockerell's stonecrop Crassulaceae Forb/herb AZ (SR) Sedum griffithsii AZ (SR) Sedum glaucophyllum cliff stonecrop Crassulaceae Forb/herb MD (E) Sedum lanceolatum spearleaf stonecrop Crassulaceae Forb/herb AZ (SR) Sedum nevii Nevius' stonecrop Crassulaceae Forb/herb GA (T), TN (E) Sedum pusillum granite stonecrop Crassulaceae Forb/herb GA (T), NC (E) Sedum stelliforme Huachuca Mountain stonecrop Crassulaceae Forb/herb AZ (SR) Selaginella apoda meadow spikemoss Selaginellaceae Forb/herb IN (E), ME (E) Selaginella eatonii Eaton's spikemoss Selaginellaceae Forb/herb FL (E) Selaginella eclipes hidden spikemoss Selaginellaceae Forb/herb IA (E), OH (T) Selaginella rupestris northern selaginella Selaginellaceae Forb/herb IN (T), OH (PRX) Selaginella selaginoides club spikemoss Selaginellaceae Forb/herb ME (T), MN (E), WI (E) Senecio congestus marsh fleabane Asteraceae Forb/herb MI (PREX) Senecio multidentatus var. huachucanus Huachuca Mountain ragwort Asteraceae Forb/herb AZ () Senecio huachucanus AZ (HS) Senna hebecarpa American senna Fabaceae Forb/herb CT (SC), MA (E), RI (H), VT (T) Cassia hebecarpa NH (E) Senna mexicana Mexican senna Fabaceae Tree, Shrub FL (T) Senna obtusifolia Java-bean Fabaceae Forb/herb, IN (R) Subshrub Sericocarpus asteroides toothed whitetop aster Asteraceae Forb/herb ME (E) Sericocarpus linifolius narrowleaf whitetop aster Asteraceae Forb/herb NH (T) Aster solidagineus NY (T), OH (T), PA (E) Sericocarpus rigidus Columbian whitetop aster Asteraceae Forb/herb OR (), WA () Aster curtus OR (T), WA (S) Sesuvium maritimum slender seapurslane Aizoaceae Forb/herb MD (E), NY (E) Setaria parviflora marsh bristlegrass Poaceae Graminoid MA (SC) Setaria geniculata IN (E), RI (SC) Seymeria cassioides yaupon blacksenna Scrophulariaceae Forb/herb TN (E, PX) Shepherdia argentea silver buffaloberry Elaeagnaceae Tree, Shrub IA (T) Shepherdia canadensis russet buffaloberry Elaeagnaceae Shrub IL (E), IN (X), ME (E), PA (E) Shinnersoseris rostrata beaked skeletonweed Asteraceae Forb/herb MN (T) Lygodesmia rostrata IA (E) Shortia galacifolia Oconee bells Diapensiaceae Subshrub, GA (E), NC (E, SC) Forb/herb Sibbaldia procumbens creeping sibbaldia Rosaceae Subshrub, NH (E) Forb/herb Sibbaldiopsis tridentata shrubby fivefingers Rosaceae Subshrub, GA (E) Forb/herb Potentilla tridentata CT (E), IA (E), NJ (E), PA (E), RI (H), TN (SC) Sida hermaphrodita Virginia fanpetals Malvaceae Forb/herb IN (E), KY (SC), MD (E), PA (E), TN (E, PX) Sidalcea covillei Owens Valley sidalcea Malvaceae Forb/herb CA (E) Sidalcea hickmanii ssp. anomala Cuesta Pass checker Malvaceae Subshrub, CA (R) Forb/herb Sidalcea hickmanii ssp. parishii Parish's checker Malvaceae Subshrub, CA (R) Forb/herb Sidalcea hirtipes bristlystem checkerbloom Malvaceae Forb/herb WA (E) Sidalcea malviflora ssp. virgata dwarf checkerbloom Malvaceae Subshrub, WA (E) Forb/herb Sidalcea nelsoniana Nelson's checkerbloom Malvaceae Forb/herb Threatened OR (T), WA (E) Sidalcea oregana ssp. oregana var. calva Oregon checkerbloom Malvaceae Subshrub, Endangered WA (E) Forb/herb Sidalcea oregana ssp. valida Kenwood Marsh checkerbloom Malvaceae Subshrub, Endangered CA (E) Forb/herb Sidalcea pedata birdfoot checkerbloom Malvaceae Forb/herb Endangered CA (E) Sidalcea stipularis Scadden Flat checkerbloom Malvaceae Forb/herb CA (E) Sideroxylon alachuense Alachua bully Sapotaceae Shrub, Tree FL (E) Sideroxylon lanuginosum ssp. lanuginosum gum bully Sapotaceae Tree, Shrub IL ()

Bumelia lanuginosa IL (E) Sideroxylon lycioides buckthorn bully Sapotaceae Tree, Shrub FL (E) Bumelia lycioides IN (E) Sideroxylon thornei Georgia bully Sapotaceae Shrub FL (E), GA (E) acaulis moss campion Caryophyllaceae Forb/herb ME (PX) Silene acaulis var. exscapa moss campion Caryophyllaceae Forb/herb NH (T) Silene campanulata ssp. campanulata Red Mountain catchfly Caryophyllaceae Forb/herb CA (E) Silene caroliniana sticky catchfly Caryophyllaceae Forb/herb FL (E), NY (EV) Silene caroliniana ssp. pensylvanica Pennsylvania catchfly Caryophyllaceae Forb/herb TN (T) Silene caroliniana var. pensylvanica OH (T) Silene caroliniana ssp. wherryi Wherry's catchfly Caryophyllaceae Forb/herb OH () Silene caroliniana var. wherryi OH (E) Silene douglasii var. oraria seabluff catchfly Caryophyllaceae Forb/herb OR (T) Silene nivea evening campion Caryophyllaceae Forb/herb MD (E), MN (T), NJ (E), OH (T), WI (T) Silene ovata Blue Ridge catchfly Caryophyllaceae Forb/herb AR (T), IL (E), IN (E), KY (T), TN (E) Silene polypetala eastern fringed catchfly Caryophyllaceae Forb/herb Endangered FL (E), GA (E) Silene regia royal catchfly Caryophyllaceae Forb/herb AR (T), GA (R), IL (E), IN (T), KY (E), TN (E, PX) Silene seelyi Seely's catchfly Caryophyllaceae Forb/herb WA (T) Silene spaldingii Spalding's silene Caryophyllaceae Forb/herb Threatened OR (E), WA (T) Silene stellata widowsfrill Caryophyllaceae Forb/herb CT (SC), MI (T), RI (H) Silene virginica fire pink Caryophyllaceae Forb/herb FL (E), MI (T), WI (E) Silphium brachiatum Cumberland rosinweed Asteraceae Forb/herb TN (E) Silphium integrifolium wholeleaf rosinweed Asteraceae Forb/herb MI (T) Silphium laciniatum compassplant Asteraceae Forb/herb MI (T), OH (E), TN (T) Silphium laciniatum var. laciniatum compassplant Asteraceae Forb/herb KY (E) Silphium laciniatum var. robinsonii Robinson's compassplant Asteraceae Forb/herb KY (T) Silphium perfoliatum cup plant Asteraceae Forb/herb MI (T) Silphium pinnatifidum tansy rosinweed Asteraceae Forb/herb KY (SC), TN (T) Silphium trifoliatum whorled rosinweed Asteraceae Forb/herb IL (E) Silphium wasiotense Appalachian rosinweed Asteraceae Forb/herb KY (SC), TN (E) Sisyrinchium albidum white blue-eyed grass Iridaceae Forb/herb PA (X) Sisyrinchium hastile MI (PREX) Sisyrinchium atlanticum eastern blue-eyed grass Iridaceae Forb/herb IL (E), MI (T), OH (E), PA (E) Sisyrinchium dichotomum wishbone blue-eyed grass Iridaceae Forb/herb Endangered NC (E) Sisyrinchium farwellii Farwell's blue-eyed grass Iridaceae Forb/herb MI (PREX) Sisyrinchium fuscatum coastal plain blue-eyed grass Iridaceae Forb/herb MA (SC), MD (E, X), RI (H) Sisyrinchium arenicola PA (X) Sisyrinchium montanum strict blue-eyed grass Iridaceae Forb/herb IL (E), IN (E), NJ (E), OH (E), WA (S) Sisyrinchium mucronatum needletip blue-eyed grass Iridaceae Forb/herb MA (E), ME (SC), NY (E), OH (E) Sisyrinchium sarmentosum mountain blue-eyed grass Iridaceae Forb/herb WA (T) Sisyrinchium septentrionale northern blue-eyed grass Iridaceae Forb/herb WA (S) Smallanthus uvedalius hairy leafcup Asteraceae Forb/herb MI (), NJ (), NY () Polymnia uvedalia MI (T), NJ (E), NY (E) Smilax coriacea Everglades greenbrier Smilacaceae Shrub, Vine FL () Smilax havanensis FL (T) Smilax lasioneura Blue Ridge carrionflower Smilacaceae Vine, Forb/herb OH () Smilax herbacea var. lasioneura OH (T) Smilax pseudochina bamboo vine Smilacaceae Vine, Forb/herb MD (T), NY (E), PA (X) Smilax pulverulenta downy carrionflower Smilacaceae Vine, Forb/herb NY (E) Smilax herbacea var. pulverulenta OH (E) Smilax tamnoides bristly greenbrier Smilacaceae Shrub, Vine CT () Smilax hispida CT (SC) Solanum bahamense var. bahamense Bahama nightshade Solanaceae Subshrub, Shrub, PR () Tree Solanum drymophilum Endangered PR (E) whitehair goldenrod Asteraceae Forb/herb Threatened KY (T) Canada goldenrod Asteraceae Forb/herb ME (PX) Solidago arguta Atlantic goldenrod Asteraceae Forb/herb OH (PRX) Solidago arguta var. arguta Atlantic goldenrod Asteraceae Forb/herb TN () Solidago tarda TN (SC) Solidago arguta var. harrisii Harris' goldenrod Asteraceae Forb/herb PA (E) Solidago buckleyi Buckley's goldenrod Asteraceae Forb/herb IN (E), KY (SC) Solidago caesia wreath goldenrod Asteraceae Forb/herb WI (E) Solidago calcicola limestone goldenrod Asteraceae Forb/herb ME (PX) Solidago curtisii mountain decumbent goldenrod Asteraceae Forb/herb KY (T), MD (E), PA (E) Solidago cutleri Cutler's alpine goldenrod Asteraceae Forb/herb NH (T) Solidago erecta showy goldenrod Asteraceae Forb/herb PA (E) Solidago flexicaulis zigzag goldenrod Asteraceae Forb/herb RI (T) Solidago gattingeri Gattinger's goldenrod Asteraceae Forb/herb TN (E) Solidago gracillima Virginia goldenrod Asteraceae Forb/herb KY (SC) Solidago hispida hairy goldenrod Asteraceae Forb/herb MD (E, X) Solidago lancifolia lance-leaf goldenrod Asteraceae Forb/herb TN (E) Solidago latissimifolia Elliott's goldenrod Asteraceae Forb/herb CT (), NY (), RI () Solidago elliottii CT (SC), NY (E), RI (SC) Solidago macrophylla largeleaf goldenrod Asteraceae Forb/herb MA (T) Solidago missouriensis Missouri goldenrod Asteraceae Forb/herb MI (T) Solidago multiradiata Rocky Mountain goldenrod Asteraceae Subshrub, ME (T) Forb/herb Solidago odora anisescented goldenrod Asteraceae Forb/herb NH (T), OH (T), VT (T) Solidago patula roundleaf goldenrod Asteraceae Forb/herb IA (E) Solidago plumosa plumed goldenrod Asteraceae Forb/herb NC (E) Solidago puberula downy goldenrod Asteraceae Forb/herb KY (SC), OH (E) Solidago pulchra Carolina goldenrod Asteraceae Forb/herb NC (E) Solidago roanensis Roan Mountain goldenrod Asteraceae Forb/herb KY (T), MD (E), PA (R) Solidago rugosa ssp. aspera wrinkleleaf goldenrod Asteraceae Forb/herb NY (E) Solidago rugosa ssp. rugosa var. sphagnophila wrinkleleaf goldenrod Asteraceae Forb/herb CT (SC), NY (E) Solidago rupestris rock goldenrod Asteraceae Forb/herb MD (E, X), TN (E) Solidago sciaphila shadowy goldenrod Asteraceae Forb/herb IL (T) Solidago sempervirens var. mexicana seaside goldenrod Asteraceae Forb/herb NY (E) Solidago shortii Short's goldenrod Asteraceae Forb/herb Endangered KY (E) Solidago simplex ssp. randii Rand's goldenrod Asteraceae Forb/herb KY (SC), MA (E), TN (T) Solidago simplex ssp. randii var. gillmanii Rand's goldenrod Asteraceae Forb/herb IN (T), WI (T) Solidago simplex ssp. randii var. racemosa Rand's goldenrod Asteraceae Forb/herb NY (E) Solidago spathulata var. racemosa PA (E) Solidago simplex ssp. randii var. randii Rand's goldenrod Asteraceae Forb/herb NY (T) Solidago simplex ssp. simplex var. spathulata Mt. Albert goldenrod Asteraceae Forb/herb, MD () Subshrub Solidago spathulata MD (T) Solidago speciosa showy goldenrod Asteraceae Forb/herb MD (T) Solidago sphacelata autumn goldenrod Asteraceae Forb/herb OH (E) Solidago spithamaea Blue Ridge goldenrod Asteraceae Forb/herb Threatened NC (E), TN (E) Solidago squarrosa stout goldenrod Asteraceae Forb/herb IN (E), KY (H), OH (T) Solidago uliginosa bog goldenrod Asteraceae Forb/herb IA (E), TN (SC) Solidago uliginosa var. linoides bog goldenrod Asteraceae Forb/herb NH () Solidago purshii NH (T) Solidago ulmifolia elmleaf goldenrod Asteraceae Forb/herb ME (PX), VT (E) Solidago verna springflowering goldenrod Asteraceae Forb/herb NC (T) Sorbus americana American mountain ash Rosaceae Tree, Shrub IL (E) Sorbus decora northern mountain ash Rosaceae Tree, Shrub IN (X), MA (E), OH (E), PA (E) Sorghastrum elliottii slender Indiangrass Poaceae Graminoid MD (E) Sorghastrum nutans Indiangrass Poaceae Graminoid ME (E), RI (SC)

Sparganium americanum American bur-reed Sparganiaceae Forb/herb IL (E) Sparganium androcladum branched bur-reed Sparganiaceae Forb/herb IN (T), PA (E), TN (E) Sparganium angustifolium narrowleaf bur-reed Sparganiaceae Forb/herb NJ (E) Sparganium emersum European bur-reed Sparganiaceae Forb/herb IL (), OH () Sparganium chlorocarpum IL (E), OH (E) Sparganium eurycarpum broadfruit bur-reed Sparganiaceae Forb/herb KY (E), NH (T) Sparganium fluctuans floating bur-reed Sparganiaceae Forb/herb CT (E) Sparganium glomeratum clustered bur-reed Sparganiaceae Forb/herb WI (T) Sparganium natans small bur-reed Sparganiaceae Forb/herb MA (E), NY (T), VT (T) Sparganium minimum CT (SC), NJ (E), PA (X) Spartina cynosuroides big cordgrass Poaceae Graminoid MA (T), RI (SC) Spartina pectinata prairie cordgrass Poaceae Graminoid WA (S) Spergularia canadensis Canadian sandspurry Caryophyllaceae Forb/herb CT (T), RI (SC) Spermacoce glabra smooth false buttonweed Rubiaceae Subshrub, MD (E) Forb/herb Spermacoce terminalis Everglades Key false buttonweed Rubiaceae Forb/herb FL (T) coccinea scarlet globemallow Malvaceae Subshrub, IA (T) Forb/herb Sphenopholis nitida shiny wedgescale Poaceae Graminoid MA (T), RI (SC), VT (E) Sphenopholis obtusata prairie wedgescale Poaceae Graminoid ME (PX), NH (E), NY (E), OH (T), RI (SC), VT (E) Sphenopholis pensylvanica swamp wedgescale Poaceae Graminoid KY (SC), MA (T), MD (T), NY (E), RI (H) Spigelia gentianoides purpleflower pinkroot Loganiaceae Forb/herb Endangered FL (E) Spigelia loganioides Florida pinkroot Loganiaceae Forb/herb FL (E) Spigelia marilandica woodland pinkroot Loganiaceae Forb/herb IN (E) Spiraea alba white meadowsweet Rosaceae Shrub KY (E), TN (E) Spiraea alba var. latifolia white meadowsweet Rosaceae Shrub OH (PRX) Spiraea betulifolia white spirea Rosaceae Shrub PA (T) Spiraea septentrionalis northern meadowsweet Rosaceae Shrub ME (SC), NY (E) Spiraea virginiana Virginia meadowsweet Rosaceae Shrub Threatened GA (T), KY (T), NC (E), OH (E), PA (X), TN (E), VA (E) Spiranthes brevilabris Texas lady's tresses Orchidaceae Forb/herb FL (E) Spiranthes casei Case's lady's tresses Orchidaceae Forb/herb NH (E), NY (EV), PA (E) Spiranthes cernua nodding lady's tresses Orchidaceae Forb/herb NY (EV) Spiranthes delitescens reclusive lady's tresses Orchidaceae Forb/herb Endangered AZ (HS) Spiranthes diluvialis Ute lady's tresses Orchidaceae Forb/herb Threatened NE (T), NV (FP), WA (E) Spiranthes lacera northern slender lady's tresses Orchidaceae Forb/herb IA (T), NY (EV) Spiranthes lacera var. gracilis northern slender lady's tresses Orchidaceae Forb/herb ME (PX) Spiranthes laciniata lacelip lady's tresses Orchidaceae Forb/herb FL (T), NJ (E) Spiranthes longilabris giantspiral lady's tresses Orchidaceae Forb/herb FL (T), NC (T) Spiranthes lucida shining lady's tresses Orchidaceae Forb/herb IA (E), IL (E), IN (R), KY (T), MD (E), ME (T), NH (T), NY (EV), RI (H), TN (T) Spiranthes magnicamporum Great Plains lady's tresses Orchidaceae Forb/herb GA (E), IN (E), KY (T), NM (E), PA (X) Spiranthes ochroleuca yellow nodding lady's tresses Orchidaceae Forb/herb IN (T), KY (SC), MD (E), NY (EV), TN (E, PX) Spiranthes odorata marsh lady's tresses Orchidaceae Forb/herb KY (E), MD (E, X), TN (E) Spiranthes ovalis October lady's tresses Orchidaceae Forb/herb FL (E), IA (T), MI (T), PA (E) Spiranthes parksii Navasota lady's tresses Orchidaceae Forb/herb Endangered TX (E) Spiranthes porrifolia creamy lady's tresses Orchidaceae Forb/herb WA (S) Spiranthes romanzoffiana hooded lady's tresses Orchidaceae Forb/herb AZ (SR), IA (T), IL (E), IN (E), MA (E), NY (EV), OH (T), PA (E) Spiranthes torta southern lady's tresses Orchidaceae Forb/herb FL (E) Spiranthes tuberosa little lady's tresses Orchidaceae Forb/herb FL (T), NY (EV), PA (X), RI (E) Spiranthes tuberosa var. grayi CT (SC) Spiranthes vernalis spring lady's tresses Orchidaceae Forb/herb IA (T), IL (E), IN (R), MA (T), NH (E), NY (E), PA (E), RI (SC) Sporobolus clandestinus rough dropseed Poaceae Graminoid CT (SC), KY (T), MD (E), NY (E), PA (E) Sporobolus compositus var. compositus composite dropseed Poaceae Graminoid CT (), ME (), RI (), VT () Sporobolus asper CT (SC), ME (E), RI (SC), VT (E) Sporobolus cryptandrus sand dropseed Poaceae Graminoid CT (E), NH (T), PA (R) Sporobolus heterolepis prairie dropseed Poaceae Graminoid CT (E), KY (E), MD (E), NC (E), NY (T), OH (T), PA (E) Sporobolus junceus pineywoods dropseed Poaceae Graminoid AR (T), TN (SC) Sporobolus neglectus puffsheath dropseed Poaceae Graminoid CT (SC), MA (E), MD (E, X), ME (PX), NH (E), NJ (E) Sporobolus pyramidatus Madagascar dropseed Poaceae Graminoid AR (T) Sporobolus teretifolius wireleaf dropseed Poaceae Graminoid NC (T) Stachydeoma graveolens mock pennyroyal Lamiaceae Subshrub, FL (E) Forb/herb Stachys aspera hyssopleaf hedgenettle Lamiaceae Forb/herb MD (E) Stachys clingmanii Clingman's hedgenettle Lamiaceae Forb/herb IN (E), MD (E), TN (T) Stachys cordata heartleaf hedgenettle Lamiaceae Forb/herb PA () Stachys nuttallii PA (E) Stachys crenata mousesear Lamiaceae Forb/herb FL (E) Stachys eplingii Epling's hedgenettle Lamiaceae Forb/herb KY (E) Stachys hyssopifolia hyssopleaf hedgenettle Lamiaceae Forb/herb CT (E), NY (T), PA (X), RI (T) Stachys lythroides FL (E) Stachys pilosa var. pilosa hairy hedgenettle Lamiaceae Forb/herb NJ () Stachys palustris var. homotricha NJ (E) Stachys tenuifolia smooth hedgenettle Lamiaceae Forb/herb CT (SC), FL (E) Stanfordia californica St. Francis cabbage Brassicaceae Forb/herb CA () Caulanthus californicus Endangered CA (E) Staphylea trifolia American bladdernut Staphyleaceae Tree, Shrub FL (E), NH (T) Stellaria alsine bog chickweed Caryophyllaceae Forb/herb MD (E), TN (E) Stellaria borealis boreal starwort Caryophyllaceae Forb/herb CT (SC), NJ (E) Stellaria crassifolia fleshy starwort Caryophyllaceae Forb/herb MI (T) Stellaria fontinalis American water starwort Caryophyllaceae Forb/herb KY (T) Arenaria fontinalis TN (T) Stellaria longifolia longleaf starwort Caryophyllaceae Forb/herb KY (SC), TN (E) Stellaria longipes longstalk starwort Caryophyllaceae Forb/herb NY (T) Stellaria pubera star chickweed Caryophyllaceae Forb/herb IL (E), NJ (E) Stenanthium gramineum eastern featherbells Liliaceae Forb/herb FL (E), IL (E), IN (E), MD (T), OH (T) Stenanthium gramineum var. micranthum eastern featherbells Liliaceae Forb/herb KY (T) Stenaria nigricans var. nigricans diamondflowers Rubiaceae Forb/herb, IN (), MI () Subshrub Hedyotis nigricans MI (PREX) Houstonia nigricans IN (R) Stenocereus thurberi organpipe cactus Cactaceae Tree, Shrub AZ (SR) Stenorrhynchos lanceolatum leafless beaked lady orchid Orchidaceae Forb/herb FL (T) Stenorrhynchos michuacanum Michuacan lady orchid Orchidaceae Forb/herb AZ () Spiranthes michuacana AZ (SR) Stenosiphon linifolius false gaura Onagraceae Subshrub, AR (T) Forb/herb Stephanomeria malheurensis Malheur wirelettuce Asteraceae Forb/herb Endangered OR (E) Stewartia malacodendron silky camellia Theaceae Tree, Shrub AR (E), FL (E), GA (R) Streptanthus hyacinthoides smooth jewelflower Brassicaceae Forb/herb AR (T) Streptanthus niger Tiburon jewelflower Brassicaceae Forb/herb Endangered CA (E) Streptanthus squamiformis pineoak jewelflower Brassicaceae Forb/herb AR (T) Streptopus amplexifolius claspleaf twistedstalk Liliaceae Forb/herb AZ (SR), NJ (E), PA (E), TN (T) Streptopus amplexifolius var. amplexifolius claspleaf twistedstalk Liliaceae Forb/herb CT () Streptopus amplexifolius var. americanus CT (T) Streptopus lanceolatus var. lanceolatus twistedstalk Liliaceae Forb/herb KY () Streptopus roseus var. perspectus KY (E) Streptopus lanceolatus var. roseus twistedstalk Liliaceae Forb/herb IA (), MD (), NJ (), OH (), RI (), TN () Streptopus roseus IA (T), MD (T), NJ (E), OH (E), RI (T), TN (SC) Strophostyles leiosperma slickseed fuzzybean Fabaceae Vine, Forb/herb IN (T) Strophostyles umbellata pink fuzzybean Fabaceae Vine, Forb/herb NY (E), RI (T) Strumpfia maritima pride of Big Pine Rubiaceae Shrub, Tree FL (E) Stuckenia filiformis ssp. alpina fineleaf pondweed Potamogetonaceae Forb/herb ME (), NH (), NY () Potamogeton filiformis var. alpinus NH (E), NY (E) Stuckenia filiformis ssp. alpinus ME (T) Stuckenia filiformis ssp. occidentalis western fineleaf pondweed Potamogetonaceae Forb/herb ME (E) Potamogeton filiformis var. occidentalis NY (E) Stuckenia pectinata sago pondweed Potamogetonaceae Forb/herb NH () Potamogeton pectinatus NH (T) Stuckenia vaginata sheathed pondweed Potamogetonaceae Forb/herb WI () Potamogeton vaginatus WI (T) Stylisma abdita showy dawnflower Convolvulaceae Forb/herb FL (E) Stylisma humistrata southern dawnflower Convolvulaceae Vine, Forb/herb TN (T) Stylisma pickeringii Pickering's dawnflower Convolvulaceae Vine, Forb/herb IA (E), IL (E) Stylisma pickeringii var. pickeringii Pickering's dawnflower Convolvulaceae Vine, Forb/herb GA (T), NC (E), NJ (E) Stylosanthes biflora sidebeak pencilflower Fabaceae Forb/herb PA (E) Stylosanthes calcicola Everglade Key pencilflower Fabaceae Forb/herb FL (E) Styrax americanus American snowbell Styracaceae Tree, Shrub IL (T), OH (PRX) Styrax grandifolius bigleaf snowbell Styracaceae Tree, Shrub IL (E), IN (E), OH (PRX) Styrax platanifolius ssp. texanus Texas snowbell Styracaceae Shrub TX () Styrax texanus Endangered TX (E) Suaeda calceoliformis Pursh seepweed Chenopodiaceae Subshrub, ME (T) Forb/herb Suaeda americana MA (SC) Suaeda linearis annual seepweed Chenopodiaceae Subshrub, NY (E) Forb/herb Suaeda maritima ssp. richii Rich's seepweed Chenopodiaceae Subshrub, ME (SC) Forb/herb Suaeda rolandii Roland's seablite Chenopodiaceae Forb/herb NJ (E), NY (E) Subularia aquatica waterawlwort Brassicaceae Forb/herb ME (SC), MI (E), MN (T) Subularia aquatica var. americana American waterawlwort Brassicaceae Forb/herb NY (E) Sullivantia oregana Oregon coolwort Saxifragaceae Forb/herb WA (T) Sullivantia sullivantii Sullivant's coolwort Saxifragaceae Forb/herb IN (T), MN (T), TN (E) Sullivantia renifolia IL (T) Swallenia alexandrae Eureka dunegrass Poaceae Graminoid Endangered CA (R) Swietenia mahagoni West Indian mahogany Meliaceae Tree FL (T) Symphoricarpos albus common snowberry Caprifoliaceae Subshrub, Shrub KY (E), MD (T) Symphoricarpos albus var. albus common snowberry Caprifoliaceae Subshrub, Shrub IL (E), MA (E), OH (PRX) Symphyotrichum anticostense Anticosti Island aster Asteraceae Forb/herb ME (E) Symphyotrichum boreale northern bog aster Asteraceae Forb/herb IA (), IN (), NJ (), NY (), PA (), WA () Aster borealis NJ (E), NY (T), PA (E), WA (T)

Aster junciformis IA (T), IN (R) Symphyotrichum ciliolatum Lindley's aster Asteraceae Forb/herb NH (), NY () Aster ciliolatus NH (T), NY (E) Symphyotrichum concolor eastern silver aster Asteraceae Forb/herb MA (E) Aster concolor KY (T), MD (E), NY (E), RI (H) Symphyotrichum depauperatum serpentine aster Asteraceae Forb/herb MD (), PA () Aster depauperatus MD (E), PA (T) Symphyotrichum divaricatum southern annual saltmarsh aster Asteraceae Forb/herb ME () Aster divaricatus ME (T) Symphyotrichum drummondii var. drummondii Drummond's aster Asteraceae Forb/herb OH () Aster drummondii OH (T) Symphyotrichum drummondii var. texanum Drummond's aster Asteraceae Forb/herb KY () Aster drummondii var. texanus KY (T) var. dumosum rice button aster Asteraceae Forb/herb IA (), OH () Aster dumosus IA (E), OH (T) Symphyotrichum ericoides var. ericoides white heath aster Asteraceae Forb/herb TN () Aster ericoides TN (T) Symphyotrichum georgianum Georgia aster Asteraceae Forb/herb NC () Aster georgianus NC (T) Symphyotrichum jessicae Jessica's aster Asteraceae Forb/herb WA () Aster jessicae WA (E) Symphyotrichum laeve var. concinnum smooth blue aster Asteraceae Forb/herb MD (), NY () Aster concinnus MD (E, X) Aster laevis var. concinnus NY (E) Symphyotrichum laeve var. laeve smooth blue aster Asteraceae Forb/herb RI () Aster laevis RI (SC) Symphyotrichum lanceolatum ssp. lanceolatum var. interior white panicle aster Asteraceae Forb/herb NY () Aster lanceolatus var. interior NY (E) Symphyotrichum lateriflorum var. lateriflorum calico aster Asteraceae Forb/herb NY () Aster lateriflorus var. hirsuticaulis NY (E) Symphyotrichum novi-belgii var. novi-belgii aster Asteraceae Forb/herb PA () Aster novi-belgii PA (T) Symphyotrichum oblongifolium aromatic aster Asteraceae Forb/herb IN (), OH () Aster oblongifolius IN (R), OH (T) Symphyotrichum ontarionis bottomland aster Asteraceae Forb/herb OH () Aster ontarionis OH (E) Symphyotrichum oolentangiense var. oolentangiense skyblue aster Asteraceae Forb/herb, NY (), TN () Subshrub Aster oolentangiensis NY (E), TN (SC) Symphyotrichum parviceps smallhead aster Asteraceae Forb/herb NC () Aster parviceps NC (E) Symphyotrichum patens var. patens late purple aster Asteraceae Forb/herb ME (), NH () Aster patens ME (PX), NH (T) Symphyotrichum pilosum var. pringlei Pringle's aster Asteraceae Forb/herb NY () Aster pilosus var. pringlei NY (T) Symphyotrichum praealtum var. praealtum willowleaf aster Asteraceae Forb/herb NJ (), TN () Aster praealtus NJ (E), TN (E) Symphyotrichum pratense barrens silky aster Asteraceae Forb/herb AR (), KY (), TN () Aster pratensis AR (T), KY (SC), TN (T) Symphyotrichum prenanthoides crookedstem aster Asteraceae Forb/herb MA (T) Aster prenanthoides CT (SC) Symphyotrichum priceae lavender oldfield aster Asteraceae Forb/herb KY () Aster pilosus var. priceae KY (T) Symphyotrichum puniceum var. puniceum purplestem aster Asteraceae Forb/herb, NJ (), NY (), PA () Subshrub Aster firmus NJ (E), PA (T) Aster puniceus var. firmus NY (E) Symphyotrichum sericeum western silver aster Asteraceae Forb/herb IN (), MI () Aster sericeus IN (R), MI (T) Symphyotrichum shortii Short's aster Asteraceae Forb/herb MN () Aster shortii MN (T) Symphyotrichum subulatum eastern annual saltmarsh aster Asteraceae Forb/herb ME (E) Aster subulatus NY (T) Symphyotrichum tenuifolium perennial saltmarsh aster Asteraceae Forb/herb NH () Aster tenuifolius NH (E)

Symphyotrichum tradescantii shore aster Asteraceae Forb/herb MA (T) Symplocarpus foetidus skunk cabbage Araceae Forb/herb TN (E) Symplocos tinctoria common sweetleaf Symplocaceae Tree, Shrub TN (SC) Synandra hispidula Guyandotte beauty Lamiaceae Forb/herb IL (E) Synthyris pinnatifida var. lanuginosa featherleaf kittentails Scrophulariaceae Forb/herb WA (S) Taenidia integerrima yellow pimpernel Apiaceae Forb/herb CT (E), RI (H), VT (T) Taenidia montana mountain pimpernel Apiaceae Forb/herb MD (T), PA (E) Tanacetum bipinnatum tansy Asteraceae Forb/herb ME (SC) Tanacetum bipinnatum ssp. huronense Lake Huron tansy Asteraceae Forb/herb MI (), WI () Tanacetum huronense MI (T), WI (E) Tauschia hooveri Hoover's umbrellawort Apiaceae Forb/herb WA (T) Tauschia tenuissima Leiberg's umbrellawort Apiaceae Forb/herb WA (PX) Taxodium distichum bald cypress Cupressaceae Tree IN (T) Taxus canadensis Canada yew Taxaceae Shrub IN (T), KY (T), MD (T), RI (SC), TN (E) Taxus floridana Florida yew Taxaceae Tree FL (E) Tectaria fimbriata least halberd fern Dryopteridaceae Forb/herb FL (E) Tectaria heracleifolia broad halberd fern Dryopteridaceae Forb/herb FL (T) Tephrosia angustissima narrowleaf hoarypea Fabaceae Shrub, Forb/herb FL (E) Tephrosia mohrii pineland hoarypea Fabaceae Forb/herb, FL (T) Subshrub Tephrosia spicata spiked hoarypea Fabaceae Forb/herb KY (E), MD (E) Tephrosia virginiana Virginia tephrosia Fabaceae Subshrub, NH (E), RI (SC) Forb/herb Tetragonotheca helianthoides pineland nerveray Asteraceae Forb/herb TN (E, PX) Tetragonotheca ludoviciana Louisiana nerveray Asteraceae Forb/herb AR (E) Tetraneuris herbacea eastern fournerved daisy Asteraceae Forb/herb IL (), MI (), OH () Hymenoxys herbacea Threatened IL (E), MI (E), OH (E) Tetrazygia bicolor Florida clover ash Melastomataceae Tree, Shrub FL (T) Teucrium canadense var. canadense Canada germander Lamiaceae Forb/herb NH () Teucrium canadense var. virginicum NH (E) Thalia dealbata powdery alligator-flag Marantaceae Forb/herb IL (E) Thalictrum arkansanum Arkansas meadow-rue Ranunculaceae Forb/herb AR (T) Thalictrum cooleyi Cooley's meadow-rue Ranunculaceae Forb/herb Endangered FL (E), GA (E), NC (E) Thalictrum coriaceum maid of the mist Ranunculaceae Forb/herb PA (E), TN (T) Thalictrum dasycarpum purple meadow-rue Ranunculaceae Forb/herb WA (S) Thalictrum debile southern meadow-rue Ranunculaceae Forb/herb GA (T) Thalictrum pubescens king of the meadow Ranunculaceae Forb/herb IN (T) Thalictrum revolutum waxyleaf meadow-rue Ranunculaceae Forb/herb IA (E), RI (H) Thalictrum thalictroides rue anemone Ranunculaceae Forb/herb FL (E), ME (PX) Anemonella thalictroides NH (T), RI (SC) Thalictrum venulosum veiny meadow-rue Ranunculaceae Forb/herb ME (PX), NY (E) Thaspium barbinode hairyjoint meadowparsnip Apiaceae Forb/herb WI (E) Thaspium pinnatifidum cutleaf meadowparsnip Apiaceae Forb/herb KY (T), TN (SC) Thaspium trifoliatum purple meadowparsnip Apiaceae Forb/herb MD (E) Thelypodium howellii ssp. spectabilis Howell's thelypody Brassicaceae Forb/herb OR (E) Thelypodium stenopetalum slenderpetal thelypody Brassicaceae Forb/herb Endangered CA (E) Thelypteris augescens abrupttip maiden fern Thelypteridaceae Forb/herb FL (T) Thelypteris grandis stately maiden fern Thelypteridaceae Forb/herb FL (E) Thelypteris noveboracensis New York fern Thelypteridaceae Forb/herb IL (E), NY (EV) Thelypteris palustris eastern marsh fern Thelypteridaceae Forb/herb NY (EV) Thelypteris patens gridscale maiden fern Thelypteridaceae Forb/herb FL (E) Thelypteris reptans creeping maiden fern Thelypteridaceae Forb/herb FL (E) Thelypteris reticulata latticevein fern Thelypteridaceae Forb/herb FL (E) Thelypteris sclerophylla stiff maiden fern Thelypteridaceae Forb/herb FL (E) Thelypteris serrata toothed latticevein fern Thelypteridaceae Forb/herb FL (E) Thelypteris simulata bog fern Thelypteridaceae Forb/herb MD (T), NC (T), NY (EV), TN (E, PX) Thermopsis fraxinifolia ashleaf goldenbanner Fabaceae Forb/herb TN (T) Thermopsis macrophylla Santa Inez goldenbanner Fabaceae Forb/herb CA () Thermopsis macrophylla var. agnina CA (R) Thermopsis mollis Allegheny Mountain goldenbanner Fabaceae Forb/herb KY (E) Thrinax radiata Florida thatch palm Arecaceae Tree FL (E) Thuja occidentalis arborvitae Cupressaceae Tree CT (T), IL (T), IN (E), KY (T), MA (E), MD (T), NJ (E), TN (SC) Thymophylla tephroleuca ashy pricklyleaf Asteraceae Forb/herb Endangered TX (E) Tiarella cordifolia heartleaf foamflower Saxifragaceae Forb/herb NJ (E), WI (E) Tilia americana var. heterophylla American basswood Tiliaceae Tree IL () Tilia heterophylla IL (E) Tillandsia balbisiana northern needleleaf Bromeliaceae Forb/herb FL (T) Tillandsia fasciculata giant airplant Bromeliaceae Forb/herb FL (E) Tillandsia flexuosa twisted airplant Bromeliaceae Forb/herb FL (T) Tillandsia pruinosa fuzzywuzzy airplant Bromeliaceae Forb/herb FL (E) Tillandsia recurvata small ballmoss Bromeliaceae Forb/herb GA (T) Tillandsia utriculata spreading airplant Bromeliaceae Forb/herb FL (E) Tillandsia variabilis leatherleaf airplant Bromeliaceae Forb/herb FL () Tillandsia valenzuelana FL (T) Tipularia discolor crippled cranefly Orchidaceae Forb/herb FL (T), MA (E), MI (T), NY (E), PA (R) Tofieldia pusilla Scotch false asphodel Liliaceae Forb/herb MI (T), MN (E) Tolumnia bahamensis variegated orchid Orchidaceae Forb/herb FL () Oncidium bahamense FL (E) Torreya taxifolia Florida nutmeg Taxaceae Tree Endangered FL (E), GA (E) Torreyochloa pallida pale false mannagrass Poaceae Graminoid KY (E), MD (E), TN (SC) Torreyochloa pallida var. pallida pale false mannagrass Poaceae Graminoid IL () Puccinellia pallida IL (E) Tournefortia hirsutissima chiggery grapes Boraginaceae Vine, Shrub FL (E) rydbergii western poison ivy Anacardiaceae Shrub, Forb/herb, OH (E) Subshrub, Vine Toxicodendron vernix poison sumac Anacardiaceae Tree, Shrub KY (E) Trachelospermum difforme climbing dogbane Apocynaceae Vine IN (R), MD (E) Tradescantia bracteata longbract spiderwort Commelinaceae Forb/herb IL (T), MI (PREX) Tradescantia ohiensis bluejacket Commelinaceae Forb/herb PA (E) Tragia cordata heartleaf noseburn Euphorbiaceae Vine, Forb/herb IN (R) Tragia saxicola Florida Keys noseburn Euphorbiaceae Forb/herb FL (T) Tragia urticifolia nettleleaf noseburn Euphorbiaceae Vine, Forb/herb KY (E) Trautvetteria caroliniensis Carolina bugbane Ranunculaceae Forb/herb IN (X), PA (R) Trema lamarckiana Lamarck's trema Ulmaceae Tree, Shrub FL (E) Trepocarpus aethusae whitenymph Apiaceae Forb/herb KY (T) Triadenum tubulosum lesser marsh St. Johnswort Clusiaceae Forb/herb OH (T) Triadenum virginicum Virginia marsh St. Johnswort Clusiaceae Forb/herb IL (E) Triadenum walteri greater marsh St. Johnswort Clusiaceae Forb/herb NJ (E), OH (E) glutinosa sticky tofieldia Liliaceae Forb/herb IL (), IN (), NH (), NY (), OH (), VT (), WI () Tofieldia glutinosa IL (T), IN (R), NH (T), NY (E), OH (T), VT (T), WI (T) Triantha racemosa coastal false asphodel Liliaceae Forb/herb MD (), NJ (), TN () Tofieldia racemosa MD (E, X), NJ (E), TN (E) Trichocentrum maculatum Cape Sable orchid Orchidaceae Forb/herb FL () Oncidium luridum FL (E) Trichomanes boschianum Appalachian bristle fern Hymenophyllaceae Forb/herb AR (T), IL (E), IN (E), NC (T), OH (E), TN (T) Trichomanes holopterum entirewing bristle fern Hymenophyllaceae Forb/herb FL (E) Trichomanes intricatum weft fern Hymenophyllaceae Forb/herb CT (SC), MA (E), NJ (E), NY (E) Trichomanes krausii treemoss bristle fern Hymenophyllaceae Forb/herb FL (E) Trichomanes lineolatum lined bristle fern Hymenophyllaceae Forb/herb FL (E) Trichomanes petersii dwarf bristle fern Hymenophyllaceae Forb/herb AR (T), NC (T), TN (T) Trichomanes punctatum dotted bristle fern Hymenophyllaceae Forb/herb FL (E) Trichophorum alpinum alpine bulrush Cyperaceae Graminoid CT (), RI () Scirpus hudsonianus CT (SC), RI (H) Trichophorum cespitosum tufted bulrush Cyperaceae Graminoid TN (E) Scirpus cespitosus IL (E), NY (T), WI (T) Trichophorum clintonii Clinton's bulrush Cyperaceae Graminoid ME (SC) Scirpus clintonii NY (E) Trichophorum planifolium bashful bulrush Cyperaceae Graminoid IL (), KY (), VT () Scirpus verecundus IL (E), KY (E), VT (E) Trichostema brachiatum fluxweed Lamiaceae Forb/herb MA (E), MI (T) Isanthus brachiatus CT (SC), NJ (E) Trichostema dichotomum forked bluecurls Lamiaceae Forb/herb IN (R), MI (T) Trichostema micranthum smallflower bluecurls Lamiaceae Forb/herb AZ (SR) Trichostema setaceum narrowleaf bluecurls Lamiaceae Forb/herb KY (E), NY (E), PA (E) Trichostema dichotomum var. lineare OH (E) Trichostigma octandrum hoopvine Phytolaccaceae Shrub, Vine FL (E) Tridens flavus var. chapmanii Chapman's tridens Poaceae Graminoid NJ (E) Trientalis borealis starflower Primulaceae Forb/herb GA (E), IL (T), KY (E), TN (T) Trifolium calcaricum running glade clover Fabaceae Forb/herb TN (E) Trifolium douglasii Douglas' clover Fabaceae Forb/herb WA (S) Trifolium owyheense Owyhee clover Fabaceae Forb/herb OR (E) Trifolium plumosum plumed clover Fabaceae Forb/herb WA (S) Trifolium reflexum buffalo clover Fabaceae Forb/herb IL (E), KY (E), MD (E, X), OH (E), PA (X), TN (E) Trifolium reflexum var. glabrum IN (E) Trifolium stoloniferum running buffalo clover Fabaceae Forb/herb Endangered IN (E), KY (T), MO (E), OH (E) Trifolium thompsonii Thompson's clover Fabaceae Forb/herb WA (T) Trifolium trichocalyx Monterey clover Fabaceae Forb/herb Endangered CA (E) Trifolium variegatum whitetip clover Fabaceae Forb/herb CA () Trifolium polyodon CA (R) Trifolium virginicum Kates Mountain clover Fabaceae Forb/herb MD (T), PA (E) Triglochin gaspensis Gaspé Peninsula arrowgrass Juncaginaceae Graminoid ME () Triglochin gaspense ME (PX) Triglochin maritima seaside arrowgrass Juncaginaceae Graminoid IA (), IL (), NJ (), OH () Triglochin maritimum IA (T), IL (T), NJ (E), OH (T) Triglochin palustris marsh arrowgrass Juncaginaceae Graminoid IA (), IL (), IN (), NY (), PA (), RI () Triglochin palustre IA (T), IL (T), IN (T), NY (T), PA (X), RI (H) Triglochin striata three-rib arrowgrass Juncaginaceae Graminoid MD () Triglochin striatum MD (E) Trillium albidum ssp. parviflorum smallflower wakerobin Liliaceae Forb/herb WA (S) Trillium parviflorum WA (S) Trillium cernuum whip-poor-will flower Liliaceae Forb/herb IL (E), NY (EV), OH (PRX) Trillium cernuum var. macranthum IN (E) Trillium decumbens trailing wakerobin Liliaceae Forb/herb TN (E) Trillium discolor mottled wakerobin Liliaceae Forb/herb NC (T) Trillium erectum red trillium Liliaceae Forb/herb IL (E), NY (EV), RI (T) Trillium flexipes nodding wakerobin Liliaceae Forb/herb MD (E), NY (E) white trillium Liliaceae Forb/herb ME (E), NY (EV) Trillium lancifolium lanceleaf wakerobin Liliaceae Forb/herb FL (E), TN (E) Trillium nivale snow trillium Liliaceae Forb/herb KY (E), MD (E), MI (T), PA (R), WI (T) Trillium persistens persistent wakerobin Liliaceae Forb/herb Endangered GA (E) Trillium pusillum dwarf wakerobin Liliaceae Forb/herb NC (E) Trillium pusillum var. ozarkanum Ozark wakerobin Liliaceae Forb/herb KY (E), TN (E) Trillium pusillum var. pusillum dwarf wakerobin Liliaceae Forb/herb KY (E), TN (E) Trillium pusillum var. virginianum Virginia wakerobin Liliaceae Forb/herb MD (T) Trillium recurvatum bloody butcher Liliaceae Forb/herb MI (T) Trillium reliquum Confederate wakerobin Liliaceae Forb/herb Endangered GA (E) Trillium rugelii illscented wakerobin Liliaceae Forb/herb TN (E) Trillium sessile toadshade Liliaceae Forb/herb MI (T), NY (E) Trillium undulatum painted trillium Liliaceae Forb/herb KY (T), MI (E), NY (EV), OH (E) Trillium viride wood wakerobin Liliaceae Forb/herb IL (E), MI (PREX) Triosteum angustifolium yellowfruit horse-gentian Caprifoliaceae Forb/herb CT (SC), MD (E), NJ (E), PA (E) Triosteum aurantiacum orangefruit horse-gentian Caprifoliaceae Forb/herb ME (E), NH (E), RI (SC) Triosteum perfoliatum feverwort Caprifoliaceae Forb/herb MA (E), RI (SC) Triphora amazonica broadleaf noddingcaps Orchidaceae Forb/herb FL () Triphora latifolia FL (E) Triphora craigheadii Craighead's noddingcaps Orchidaceae Forb/herb FL (E) Triphora trianthophora threebirds Orchidaceae Forb/herb CT (SC), FL (T), MA (E), MD (E, X), ME (T), MI (T), NH (T), NJ (E), NY (E), OH (T), PA (E), VT (T) Triplasis purpurea purple sandgrass Poaceae Graminoid KY (H), PA (E) Tripsacum dactyloides eastern gamagrass Poaceae Graminoid MA (E), NY (T), PA (E), RI (SC) Tripsacum floridanum Florida gamagrass Poaceae Graminoid FL (T) Trisetum melicoides purple false oat Poaceae Graminoid ME (E), NY (E), WI (E) spike trisetum Poaceae Graminoid PA (E), WI (T) Trisetum spicatum var. molle CT (SC), NC (E) Trisetum spicatum var. pilosiglume NH (E) Trisetum triflorum ssp. molle MA (E) Triteleia lemmoniae Oak Creek triteleia Liliaceae Forb/herb AZ (SR) Triteleiopsis palmeri Palmer's Bajalily Liliaceae Forb/herb AZ (SR) Trollius laxus American globeflower Ranunculaceae Forb/herb CT (E), OH (E), PA (E) Trollius laxus ssp. laxus American globeflower Ranunculaceae Forb/herb NJ (E), NY (R) Tropidia polystachya young palm orchid Orchidaceae Forb/herb FL (E) Tsuga caroliniana Carolina hemlock Pinaceae Tree TN (T) Tsuga mertensiana mountain hemlock Pinaceae Tree NV (CY) Tuctoria greenei awnless spiralgrass Poaceae Graminoid Endangered CA (R) Tuctoria mucronata prickly spiralgrass Poaceae Graminoid Endangered CA (E) Tumamoca macdougalii Tumamoc globeberry Cucurbitaceae Vine, Forb/herb AZ (SR) Ulmus crassifolia cedar Ulmaceae Tree TN (SC) Ulmus rubra slippery elm Ulmaceae Tree ME (PX), RI (SC) Ulmus serotina September elm Ulmaceae Tree KY (SC) Ulmus thomasii rock elm Ulmaceae Tree IL (E), NY (T), OH (T) Urtica chamaedryoides heartleaf nettle Urticaceae Forb/herb IL (T), OH (E) Utricularia cornuta horned bladderwort Lentibulariaceae Forb/herb IL (E), IN (T), OH (E), TN (SC) Utricularia geminiscapa hiddenfruit bladderwort Lentibulariaceae Forb/herb IN (E), OH (E), RI (SC) Utricularia gibba humped bladderwort Lentibulariaceae Forb/herb RI (SC) Utricularia biflora CT (SC), MD (E), NJ (E), RI (T) Utricularia fibrosa PA (X) Utricularia inflata swollen bladderwort Lentibulariaceae Forb/herb MD (E), MI (E), NY (E), TN (SC) Utricularia intermedia flatleaf bladderwort Lentibulariaceae Forb/herb IL (E), OH (T), PA (T), RI (SC), WA (S) Utricularia juncea southern bladderwort Lentibulariaceae Forb/herb NY (T) Utricularia macrorhiza common bladderwort Lentibulariaceae Forb/herb KY (E) Utricularia minor lesser bladderwort Lentibulariaceae Forb/herb IL (E), IN (E), NJ (E), NY (T), PA (T), RI (H) Utricularia olivacea piedmont bladderwort Lentibulariaceae Forb/herb NC (T), NJ (E) Utricularia purpurea eastern purple bladderwort Lentibulariaceae Forb/herb IN (R), MD (T), PA (R) Utricularia radiata little floating bladderwort Lentibulariaceae Forb/herb IN (E), NY (T), PA (E) Utricularia resupinata lavender bladderwort Lentibulariaceae Forb/herb CT (E), IN (X), MA (T), MD (E), ME (E), NJ (E), PA (X), RI (SC), TN (SC), VT (T) Utricularia striata striped bladderwort Lentibulariaceae Forb/herb MA (T), NY (T) Utricularia fibrosa CT (SC), MD (E) Utricularia subulata zigzag bladderwort Lentibulariaceae Forb/herb IN (T), MA (SC), MI (T), RI (SC), TN (T) Uvularia floridana Florida bellwort Liliaceae Forb/herb FL (E) Uvularia grandiflora largeflower bellwort Liliaceae Forb/herb CT (E), NH (E) Uvularia perfoliata perfoliate bellwort Liliaceae Forb/herb IN (E), NH (E) Uvularia puberula mountain bellwort Liliaceae Forb/herb PA (R) Uvularia puberula var. nitida NJ (E), NY (E) Vaccinium angustifolium lowbush blueberry Ericaceae Subshrub, Shrub IA (T) Vaccinium boreale northern blueberry Ericaceae Subshrub, Shrub ME (T), NY (T) Vaccinium cespitosum dwarf bilberry Ericaceae Subshrub, Shrub MI (T), NY (E), WI (E) Vaccinium corymbosum highbush blueberry Ericaceae Shrub IL (E) Vaccinium elliottii Elliott's blueberry Ericaceae Shrub TN (E) Vaccinium macrocarpon cranberry Ericaceae Subshrub, Shrub IL (E), TN (T) Vaccinium myrtilloides velvetleaf huckleberry Ericaceae Subshrub, Shrub CT (SC), IA (T), IN (E), OH (T), WA (S) Vaccinium oxycoccos small cranberry Ericaceae Subshrub, Shrub IL (E), IN (T), MD (T), OH (T) Vaccinium stamineum deerberry Ericaceae Shrub VT (E) Vaccinium uliginosum bog blueberry Ericaceae Subshrub, Shrub MI (T), MN (T), NY (R) Vaccinium vitis-idaea lingonberry Ericaceae Shrub, Subshrub MI (E) Vaccinium vitis-idaea ssp. minus northern mountain cranberry Ericaceae Shrub, Subshrub MA (E), WI (E) Vaccinium vitis-idaea var. minus CT (SC) Vahlodea atropurpurea mountain hairgrass Poaceae Graminoid ME (PX) Valeriana edulis tobacco root Valerianaceae Forb/herb IN (E) Valeriana edulis var. ciliata tobacco root Valerianaceae Forb/herb MI (T), MN (T) Valeriana ciliata OH (E) Valeriana pauciflora largeflower valerian Valerianaceae Forb/herb MD (E) Valeriana uliginosa mountain valerian Valerianaceae Forb/herb IL (E), IN (E), ME (SC), NH (E), NY (E), OH (PRX), VT (E) Valeriana sitchensis ssp. uliginosa WI (T) Valerianella chenopodiifolia goosefoot cornsalad Valerianaceae Forb/herb IL (E), IN (E), MD (E), MI (T), NY (E) Valerianella radiata beaked cornsalad Valerianaceae Forb/herb NJ (E) Valerianella radiata var. fernaldii CT (SC) Valerianella umbilicata navel cornsalad Valerianaceae Forb/herb IL (E), MD (E, X), MI (T), NJ (E), NY (E) Vallesia antillana tearshrub Apocynaceae Tree, Shrub FL (E) Vallisneria americana American eelgrass Hydrocharitaceae Forb/herb KY (SC) Vanilla barbellata wormvine orchid Orchidaceae Vine, Forb/herb FL (E) Vanilla dilloniana leafless vanilla Orchidaceae Vine, Forb/herb FL (E) Vanilla phaeantha leafy vanilla Orchidaceae Vine, Forb/herb FL (E) Vauquelinia californica ssp. pauciflora Arizona rosewood Rosaceae Tree, Shrub AZ () Vauquelinia pauciflora AZ (SR) Veratrum californicum California false hellebore Liliaceae Forb/herb AZ (SR) Veratrum hybridum slender bunchflower Liliaceae Forb/herb Melanthium hybridum CT (SC) Melanthium latifolium MD (E), TN (E) Veratrum insolitum Siskiyou false hellebore Liliaceae Forb/herb WA (S) Veratrum parviflorum Appalachian bunchflower Liliaceae Forb/herb KY () Melanthium parviflorum KY (E) Veratrum virginicum Virginia bunchflower Liliaceae Forb/herb IL (), IN (), KY (), NJ (), NY (), OH (), TN () Melanthium virginicum IL (T), IN (E), KY (E), NJ (E), NY (E), OH (T), TN (E) Veratrum woodii Wood's bunchflower Liliaceae Forb/herb FL (E), IA (T), IL (T), OH (T) Melanthium woodii GA (R), KY (T), TN (E) Verbena californica Red Hills vervain Verbenaceae Forb/herb Threatened CA (T) Verbena simplex narrowleaf vervain Verbenaceae Forb/herb CT (SC), MA (E), NJ (E) Verbena urticifolia white vervain Verbenaceae Forb/herb ME (PX) Verbesina alternifolia wingstem Asteraceae Forb/herb NY (T) Verbesina chapmanii Chapman's crownbeard Asteraceae Forb/herb FL (T) Verbesina dissita bigleaf crownbeard Asteraceae Subshrub Threatened CA (T) Verbesina occidentalis yellow crownbeard Asteraceae Forb/herb OH (E) Vernonia gigantea giant ironweed Asteraceae Forb/herb NY (E) Vernonia glauca broadleaf ironweed Asteraceae Forb/herb NJ (E), PA (E) Vernonia missurica Missouri ironweed Asteraceae Forb/herb OH (E) Vernonia noveboracensis New York ironweed Asteraceae Forb/herb KY (SC), OH (PRX) Veronica americana American speedwell Scrophulariaceae Forb/herb IL (E), IN (X), KY (H), TN (SC) Veronica anagallis-aquatica water speedwell Scrophulariaceae Forb/herb IN (T) Veronica catenata MA (E), NJ (E), TN (E) Veronica scutellata skullcap speedwell Scrophulariaceae Forb/herb IL (T), MD (E), TN (E) Veronica wormskjoldii American alpine speedwell Scrophulariaceae Forb/herb ME (E), NH (E) Veronicastrum virginicum Culver's root Scrophulariaceae Forb/herb MA (T), NY (T), VT (E) Viburnum bracteatum bracted arrowwood Caprifoliaceae Shrub GA (E), TN (E) Viburnum dentatum var. venosum southern arrowwood Caprifoliaceae Tree, Shrub NY (T) Viburnum edule squashberry Caprifoliaceae Shrub ME (SC), MI (T), NY (T), VT (T), WI (E) Viburnum lantanoides hobblebush Caprifoliaceae Shrub KY (E) Viburnum alnifolium NJ (E), RI (SC) Viburnum molle softleaf arrowwood Caprifoliaceae Shrub IL (T), IN (R), KY (T), OH (E) Viburnum nudum possumhaw Caprifoliaceae Tree, Shrub CT (SC), KY (E), PA (E) Viburnum nudum var. cassinoides withe-rod Caprifoliaceae Tree, Shrub IN () Viburnum cassinoides IN (E) Viburnum nudum var. nudum possumhaw Caprifoliaceae Tree, Shrub NY (E), RI (T) Viburnum opulus var. americanum American cranberrybush Caprifoliaceae Tree, Shrub IN (E), OH (T) Viburnum trilobum PA (R) Viburnum prunifolium blackhaw Caprifoliaceae Tree, Shrub CT (SC) Viburnum rafinesqueanum downy arrowwood Caprifoliaceae Shrub MA (E), NH (E) Viburnum rafinesqueanum var. rafinesqueanum KY (T) Vicia americana American vetch Fabaceae Vine, Forb/herb MD (E, X) Vicia caroliniana Carolina vetch Fabaceae Vine, Forb/herb NJ (E) Vicia ocalensis Ocala vetch Fabaceae Vine, Forb/herb FL (E) adunca hookedspur violet Violaceae Forb/herb MA (E) Viola affinis sand violet Violaceae Forb/herb NH (E) Viola blanda var. palustriformis sweet white violet Violaceae Forb/herb IA (), IL () Viola incognita IA (E), IL (E) Viola brittoniana northern coastal violet Violaceae Forb/herb CT (E), MA (T), ME (PX), PA (E) Viola brittoniana var. brittoniana northern coastal violet Violaceae Forb/herb NY (E) Viola canadensis Canadian white violet Violaceae Forb/herb CT (T), IL (E), ME (E), NJ (E), RI (H) Viola egglestonii glade violet Violaceae Forb/herb IN (E) Viola septemloba ssp. egglestonii KY (SC) Viola epipsila dwarf marsh violet Violaceae Forb/herb MI (T) Viola hirsutula southern woodland violet Violaceae Forb/herb CT (SC), IN (X), NY (E) Viola labradorica alpine violet Violaceae Forb/herb IL () Viola conspersa IL (T) Viola lanceolata bog white violet Violaceae Forb/herb MN (T), VT (T) Viola missouriensis Missouri violet Violaceae Forb/herb OH (E) Viola nephrophylla northern bog violet Violaceae Forb/herb CT (SC), MA (E), NH (T), NY (E), OH (E) Viola novae-angliae New England blue violet Violaceae Forb/herb ME (SC), MI (T), NY (E) Viola nuttallii Nuttall's violet Violaceae Forb/herb MN (T) Viola ×palmata early blue violet Violaceae Forb/herb ME (), NH (), RI () Viola palmata ME (PX), NH (E), RI (T) Viola palustris marsh violet Violaceae Forb/herb ME (E), NH (T) Viola pedata birdfoot violet Violaceae Forb/herb NY (EV), OH (T) Viola pedata var. lineariloba NH (T) Viola pedatifida prairie violet Violaceae Forb/herb IN (T), MI (T), OH (E), PA (E) Viola ×primulifolia Violaceae Forb/herb IL (E), IN (R), NY (T), OH (E) Viola pubescens downy yellow violet Violaceae Forb/herb RI (SC) Viola renifolia white violet Violaceae Forb/herb IA (T), PA (X), WA (S) Viola renifolia var. brainerdii CT (SC) Viola rotundifolia roundleaf yellow violet Violaceae Forb/herb RI (SC) Viola sagittata var. ovata arrowleaf violet Violaceae Forb/herb WI () Viola fimbriatula WI (E) Viola selkirkii Selkirk's violet Violaceae Forb/herb CT (SC) Viola septentrionalis northern woodland violet Violaceae Forb/herb NJ (E) Viola striata striped cream violet Violaceae Forb/herb CT (SC) Viola tripartita threepart violet Violaceae Forb/herb FL (E), OH (PRX), PA (X), TN (SC) Viola tripartita var. glaberrima OH (E) Viola ×viarum twoflower violet Violaceae Forb/herb IL () Viola viarum IL (E) Viola walteri prostrate blue violet Violaceae Forb/herb KY (T), OH (E) Vitis aestivalis summer grape Vitaceae Vine ME (E) Vitis cinerea var. baileyana graybark grape Vitaceae Vine PA (E) Vitis labrusca fox grape Vitaceae Vine KY (SC) Vitis ×novae-angliae pilgrim grape Vitaceae Vine CT (SC), MD (E, X), PA (E) Vitis palmata catbird grape Vitaceae Vine IN (R) Vitis rupestris sand grape Vitaceae Vine, Shrub IN (E), KY (T), PA (E), TN (PE, SC) Vitis vulpina frost grape Vitaceae Vine MI (T), NY (E) Vittaria appalachiana Appalachian shoestring fern Vittariaceae Forb/herb IN (R), NY (E), PA (T) Voyria parasitica parasitic ghostplant Gentianaceae Forb/herb FL () Leiphaimos parasitica FL (E) Vulpia elliotea squirreltail fescue Poaceae Graminoid NJ (E) Vulpia octoflora sixweeks fescue Poaceae Graminoid VT (E) Vulpia octoflora var. glauca sixweeks fescue Poaceae Graminoid NH () Festuca octoflora var. tenella NH (E) Waldsteinia fragarioides Appalachian barren strawberry Rosaceae Forb/herb CT (SC), IL (E), IN (R), MA (SC), ME (E), NH (T) Waldsteinia lobata piedmont barren strawberry Rosaceae Forb/herb GA (T) Warea amplexifolia wideleaf pinelandcress Brassicaceae Forb/herb Endangered FL (E) Warea carteri Carter's pinelandcress Brassicaceae Forb/herb Endangered FL (E) Washingtonia filifera California fan palm Arecaceae Tree AZ (SR) Wisteria frutescens American wisteria Fabaceae Vine MI (T) Wisteria macrostachya IN (R) Wolffia brasiliensis Brazilian watermeal Lemnaceae Forb/herb MI () Wolffia papulifera MI (T) Wolffia columbiana Columbian watermeal Lemnaceae Forb/herb ME (T) Wolffiella gladiata Florida mudmidget Lemnaceae Forb/herb OH (T), PA (R) Wolffiella floridana IN (X), MD (E, X), NJ (E) Woodsia alpina alpine woodsia Dryopteridaceae Forb/herb ME (T), MI (T), NY (E), VT (E) Woodsia appalachiana Appalachian cliff fern Dryopteridaceae Forb/herb KY (E) Woodsia scopulina ssp. appalachiana TN (SC) Woodsia glabella smooth woodsia Dryopteridaceae Forb/herb MA (E), ME (T), MN (T), NH (E), NY (E) Woodsia ilvensis rusty woodsia Dryopteridaceae Forb/herb IA (E), IL (E), MD (T), NY (EV), OH (PRX), RI (H) Woodsia obtusa bluntlobe cliff fern Dryopteridaceae Forb/herb ME (T), MI (T), NH (T), NY (EV) Woodsia oregana Oregon cliff fern Dryopteridaceae Forb/herb IA (T) Rocky Mountain woodsia Dryopteridaceae Forb/herb MN (T) Woodsia scopulina Woodwardia areolata netted chainfern Blechnaceae Forb/herb IN (R), ME (PX), MI (PREX), NH (E), NY (EV), PA (T) Woodwardia fimbriata giant chainfern Blechnaceae Forb/herb WA (S) Woodwardia virginica Virginia chainfern Blechnaceae Forb/herb NY (EV), TN (SC), VT (T) Xanthorhiza simplicissima yellowroot Ranunculaceae Subshrub, FL (E) Forb/herb Xerophyllum asphodeloides eastern turkeybeard Liliaceae Forb/herb GA (R), KY (H), TN (T) Xyris ambigua coastal plain yelloweyed grass Xyridaceae Forb/herb TN (E) Xyris baldwiniana Baldwin's yelloweyed grass Xyridaceae Forb/herb AR (T) Xyris caroliniana Carolina yelloweyed grass Xyridaceae Forb/herb NJ (E) Xyris chapmanii Chapman's yelloweyed grass Xyridaceae Forb/herb FL (E) Xyris difformis bog yelloweyed grass Xyridaceae Forb/herb IN (T), KY (E), OH (E) Xyris fimbriata fringed yelloweyed grass Xyridaceae Forb/herb MD (E), NJ (E), TN (E) Xyris isoetifolia quillwort yelloweyed grass Xyridaceae Forb/herb FL (E) Xyris laxifolia var. iridifolia irisleaf yelloweyed grass Xyridaceae Forb/herb TN (SC) Xyris longisepala Kral's yelloweyed grass Xyridaceae Forb/herb FL (E) Xyris montana northern yelloweyed grass Xyridaceae Forb/herb CT (E), NJ (E), PA (R), RI (T), VT (T) Xyris scabrifolia Harper's yelloweyed grass Xyridaceae Forb/herb FL (T) Xyris smalliana Small's yelloweyed grass Xyridaceae Forb/herb CT (E), MD (E), ME (E) Xyris tennesseensis Tennessee yelloweyed grass Xyridaceae Forb/herb Endangered GA (E), TN (E) Xyris torta slender yelloweyed grass Xyridaceae Forb/herb IA (E), MN (E), OH (E), PA (T) Yucca angustissima var. angustissima narrowleaf yucca Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Yucca angustissima var. kanabensis Kanab yucca Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Yucca baccata banana yucca Agavaceae Subshrub, Shrub, AZ (), NV () Forb/herb Yucca baccata var. baccata AZ (HR, SR), NV (CY) Yucca baccata var. vespertina AZ (SR), NV (CY) Yucca baileyi var. intermedia intermediate yucca Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Yucca brevifolia var. brevifolia Joshua tree Agavaceae Tree, Shrub AZ (SR), NV (CY) Yucca brevifolia var. jaegeriana Jaeger's Joshua tree Agavaceae Tree, Shrub AZ (SR), NV (CY) Yucca elata soaptree yucca Agavaceae Tree, Shrub AZ (), NV () Yucca elata var. elata AZ (SR) Yucca elata var. utahensis AZ (SR), NV (CY) Yucca elata var. verdiensis AZ (SR) Yucca gloriosa moundlily yucca Agavaceae Tree, Shrub, FL (E) Forb/herb Yucca harrimaniae Spanish bayonet Agavaceae Subshrub, Shrub, AZ (SR) Forb/herb Yucca harrimaniae var. harrimaniae Spanish bayonet Agavaceae Subshrub, Shrub, NV (CY) Forb/herb Yucca schidigera Mojave yucca Agavaceae Tree, Shrub, AZ (HR, SR), Forb/herb NV (CY) Yucca ×schottii Schott's yucca Agavaceae Tree, Shrub, AZ (SR) Subshrub, Forb/herb Yucca arizonica AZ (SR) Yucca thornberi AZ (SR) Zannichellia palustris horned pondweed Zannichelliaceae Forb/herb IN (E), ME (SC), NH (T) Zanthoxylum americanum common pricklyash Rutaceae Tree, Shrub FL (E), MD (E), NH (E), TN (SC) Zanthoxylum coriaceum Biscayne pricklyash Rutaceae Tree, Shrub FL (E) Zanthoxylum flavum West Indian satinwood Rutaceae Tree, Shrub FL (E) Zephyranthes atamasca Atamasco lily Liliaceae Forb/herb FL (T), MD (E) Zephyranthes longifolia copper zephyrlily Liliaceae Forb/herb AZ (SR) Zephyranthes simpsonii redmargin zephyrlily Liliaceae Forb/herb FL (T) Zephyranthes treatiae zephyrlily Liliaceae Forb/herb FL (T) Zigadenus elegans mountain deathcamas Liliaceae Forb/herb AZ (SR) Zigadenus elegans ssp. glaucus mountain deathcamas Liliaceae Forb/herb NY (T) Zigadenus elegans var. glaucus IN (R), PA (E) Zigadenus glaucus IL (E), TN (E) Zigadenus leimanthoides pine barren deathcamas Liliaceae Forb/herb FL (E), NJ (E), TN (T) Zigadenus paniculatus foothill deathcamas Liliaceae Forb/herb AZ (SR) Zigadenus virescens green deathcamas Liliaceae Forb/herb AZ (SR) Zizania aquatica annual wildrice Poaceae Graminoid OH (T), PA (R), RI (SC) Zizania aquatica var. aquatica annual wildrice Poaceae Graminoid MI (T) Zizania palustris var. interior northern wildrice Poaceae Graminoid KY (H) Zizania texana Texas wildrice Poaceae Graminoid Endangered TX (E) Zizaniopsis miliacea giant cutgrass Poaceae Graminoid KY (T), MD (E) Zizia aptera meadow zizia Apiaceae Forb/herb CT (E), IN (R), MI (T), RI (H) Zizia aurea golden zizia Apiaceae Forb/herb RI (SC) Ziziphus celata Florida jujube Rhamnaceae Shrub Endangered FL (E)

Time Generated: 09/23/2016 12:10 PM CDT

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