Acanthaceae Hygrophila Occasional lacustris Acanthaceae Justicia ovata Uncommon Acanthaceae Ruellia humilis Common Acanthaceae Ruellia nudiflora s.n. Uncommon Acanthaceae Ruellia Occasional pedunculata Aceraceae Acer rubrum Occasional Agavaceae Yucca louisianica Uncommon Aiozaceae Molluga Occasional verticillata Alismataceae Echinodorus Occasional cordifolius Alismataceae Sagittaria Rare papillosa Alismataceae Sagittaria 156 Uncommon platyphylla Alliaceae Allium Occasional canadense var. canadense Alliaceae Allium Occasional canadense var. mobilense Alliaceae Allium 96, Uncommon drummondii 124 (Keith 96, 124) Amaranthaceae Alternanthera Common philoxeroides Amaryllidaceae Hymenocallis Uncommon liriosome Anacardiaceae Rhus aromatica Uncommon Anacardiaceae Rhus copallinum Occasional Anacardiaceae Toxicodendron Frequent radicans Apiaceae Bifora americana Common Apiaceae Centella erecta Uncommon Apiaceae Chaerophyllum Uncommon tainturieri Apiaceae Cicuta Uncommon maculatum Apiaceae Cynosciadium Uncommon digitatum Apiaceae Eryngium Common yuccifolium Apiaceae Hydrocotyle Occasional verticillata Apiaceae Polytaenia Frequent texana Apiaceae Ptilimnium Common capillaceum Apiaceae Ptilimnium Common nuttallii Apiaceae Spermolepsis Common inermis Apiaceae Torilis arvensis Occasional Apocynaceae Apocynum Occasional cannibinum Apocynaceae Nerium oleander Rare Apocynaceae Trachelospermu Occasional m difforme Aquifoliaceae Ilex decidua Common Aquifoliaceae Ilex opaca Common Aquifoliaceae Ilex vomitoria Abundant Araceae Arisaema Rare dracontium Araceae Arisaema Rare triphyllum Araceae Colocasia Uncommon esculenta Araceae Pistia stratiodes 15 Uncommon Araliaceae Aralia spinosa Occasional Arecaceae Sabal minor Common Asclepiadaceae Asclepias Occasional tuberosa Asclepiadaceae Asclepias Occasional verticillata Asclepiadaceae Asclepias Uncommon viridiflora Asclepiadaceae Asclepias viridis Common Asclepiadaceae Matelea Uncommon decipiens Asclepiadaceae Matelea Uncommon gonocarpa Aspleniaceae Asplenium Common platyneuron Asteraceae Ambrosia Common psilostachya Asteraceae Ambrosia trifida Common Asteraceae Baccharis Occasional halimifolia Asteraceae Berlandiera Uncommon pumila Asteraceae Bidens bipinnata Occasional Asteraceae Bigelowia Uncommon nuttallii Asteraceae Boltonia diffusa Common Asteraceae Brickellia Uncommon eupatorioides Asteraceae Cacalia Common plantaginea Asteraceae Chaetopappa 39 Uncommon asteroides Asteraceae Chrysopsis pilosa Uncommon Asteraceae Chrysopsis Uncommon texana Asteraceae Cirsium Rare carolinianum Asteraceae Cirsium Uncommon horridulum Asteraceae Conyza Uncommon canadensis Asteraceae Coreopsis basalis Uncommon Asteraceae Coreopsis Uncommon lanceolata Asteraceae Croptilon Uncommon divaricata Asteraceae Dracopsis Uncommon amplexicaule Asteraceae Echinacea Occasional sanguinea Asteraceae Eclipta prostrata Occasional Asteraceae Elephantopus Uncommon carolinianus Asteraceae Elephantopus Occasional nudatus Asteraceae Elephantopus Occasional tomentosus Asteraceae Englemannia Uncommon peristenia Asteraceae Erigeron Occasional strigosus Asteraceae Erigeron tenuis Occasional Asteraceae Erechtites Rare hieracifolia Asteraceae Eupatorium Uncommon capillifolium Asteraceae Eupatorium Common coelestinum Asteraceae Eupatorium Occasional semiserratum Asteraceae Eupatorium Occasional serotinum Asteraceae Eurybia paludosa Rare Asteraceae Euthamia Occasional leptocephala Asteraceae Evax candida Occasional Asteraceae Facelis retusa Uncommon Asteraceae Gaillardia Uncommon pulchella Asteraceae Grindelia Uncommon lanceolata Asteraceae Gutierrezia Occasional dranunculoides Asteraceae Helenium Occasional amarum Asteraceae Helenium Occasional flexuosum Asteraceae Helianthus Common hirsutus Asteraceae Helianthus Common maximiliani Asteraceae Hieracium Occasional gronovii Asteraceae Hymenopappus Uncommon artemisiifolius Asteraceae Iva angustifolia Common Asteraceae Iva annua Common Asteraceae Krigia caespitosa Common Asteraceae Krigia dandelion Occasional Asteraceae Krigia Common occidentalis Asteraceae Krigia wrightii Uncommon Asteraceae Liatris aspera Occasional Asteraceae Liatris cymosa 195 Occasional G S2 Very rare endemic restricted 2 to Catahoula outcrops Asteraceae Liatris elegans Uncommon Asteraceae Liatris mucronata Common Asteraceae Liatris Uncommon pycnostachya Asteraceae Liatris squarrosa Uncommon Asteraceae Mikania Uncommon scandens Asteraceae Packera obovata Common Asteraceae Palafoxia callosa Common Asteraceae Pityopsis Occasional graminifolia Asteraceae Pluchea Uncommon camphorata Asteraceae Pluchea odorata Common Asteraceae Polymnia Rare uvedelia Asteraceae Pseudognaphliu Uncommon m obtusifolium Asteraceae Pyrrhopappus Uncommon carolinianus Asteraceae Rudbeckia Occasional grandiflora Asteraceae Rudbeckia hirta Common Asteraceae Rudbeckia Frequent maxima Asteraceae Rudbeckia Uncommon missouriensis Asteraceae Solidago Common canadensis Asteraceae Solidago nitida Rare Asteraceae Solidago radula Uncommon Asteraceae Solidago Common ulmifolia Asteraceae Soliva Occasional pterosperma Asteraceae Symphyotrichum Abundant drummondii Asteraceae Symphyotrichum Occasional dumosum Asteraceae Symphyotrichum 43 Uncommon ericoides Asteraceae Symphyotrichum Common lateriflorum Asteraceae Symphyotrichum 28 Rare oolentangiensis (Keith 28) Asteraceae Symphyotrichum Common patens Asteraceae Symphyotrichum Uncommon pratensis Asteraceae Symphyotrichum Uncommon subulatum Asteraceae Tetraneuris Common G S5 Easternmost distribution in linearifolia 5 Texas Asteraceae Verbesina Common virginica Asteraceae Vernonia Uncommon baldwiniana Asteraceae Vernonia texana Uncommon Asteraceae Youngia japonica Occasional Azollaceae Azolla Occasional caroliniana Berberidiaceae Nandina Uncommon domestica Berberidiaceae Podophyllum Uncommon peltatum Betulaceae Carpinus Common caroliniana Betulaceae Ostrya virginiana Common Bignoniaceae Bignonia Occasional capreolata Bignoniaceae Campsis radicans Frequent Bignoniaceae Catalpa Uncommon bignoides Boraginaceae Heliotropium Uncommon indica Boraginaceae Heliotropium 22 Rare procumbens Boraginaceae Heliotropium Uncommon tenellum Boraginaceae Lithospermum Uncommon incisum Boraginaceae Myosotis Common macrosperma Brassicaceae Cardimine Uncommon parviflora Brassicaceae Lepidium Common virginicum Brassicaceae Sibara virginica Rare Bromeliaceae Tillandsia Rare recurvata Bromeliaceae Tillandsia Common usneoides Cactaceae Opuntia Uncommon macrorhiza Callitrichaceae Callitriche Uncommon heterophylla Callitrichaceae Callitriche Rare nuttallii Callitrichaceae Callitriche Uncommon peploides Callitrichaceae Callitriche Uncommon terrestris Campanulaceae Triodanis biflora Common Caprifoliaceae Lonicera japonica Uncommon Caprifoliaceae Lonicera Occasional sempervirens Caprifoliaceae Sambucus Frequent canadensis Caprifoliaceae Symphiocarpos Uncommon orbiculatus Caprifoliaceae Viburnum Common rufidulum Caryophyllaceae Cerastium Uncommon glomeratum Caryophyllaceae Minuartia 126 Occasional muscorum Caryophyllaceae Minuartia patula Rare Caryophyllaceae Paronychia 12 Uncommon G S5 Easternmost distribution in virginica 4 Texas Caryophyllaceae Silene antirrhina Rare Caryophyllaceae Spergularia 128 Rare salina Caryophyllaceae Stellaria media Frequent Chenopodiaceae Chenopodium Uncommon ambrosioides Cistaceae Helianthemum Common carolinianum Cistaceae Lechea Uncommon mucronata Cistaceae Lechea san- 150 Uncommon G S4 Uncommon endemic in Texas sabeana (Keith 4 associated with Catahoula 150) formation Cistaceae Lechea tenuifolia Occasional Clusiaceae Hypericum Uncommon drummondii Clusiaceae Hypericum Common hypericoides Commelinaceae Commelina Rare diffusa Commelinaceae Commelina Occasional erecta Commelinaceae Commelina Common virginica Commelinaceae Tradescantia Common hirsutiflora Commelinaceae Tradescantia Uncommon ohioensis Convolvulaceae Dichondra Common carolinense Convolvulaceae Ipomoea Uncommon cordatotriloba Convolvulaceae Ipomoea wrightii Rare G S5 Easternmost distribution in (Keith 37) 4 Texas Convolvulaceae Stylisma Frequent humistrata Cornaceae Cornus Common drummondii Cornaceae Cornus florida Frequent Crassulaceae Crassula aquatica Uncommon (Keith 91) Crassulaceae Sedum Uncommon G S5 Easternmost distribution in nuttallianum 4 Texas (Keith 151) Cucurbitaceae Melothria Occasional pendula Cupressaceae Juniperus Frequent virginiana Cyperaceae Bulbostylis 40 Uncommon ciliatifolia var. ciliatifolia (Keith 40) Cyperaceae Carex albicans Common Cyperaceae Carex annectans 540 Uncommon Cyperaceae Carex bulbostylis 118 Uncommon Cyperaceae Carex bushii Common Cyperaceae Carex caroliniana 120 Uncommon Cyperaceae Carex Common cherokeensis Cyperaceae Carex Common complanata Cyperaceae Carex crinita 538 Rare Cyperaceae Carex crus-corvi Uncommon Cyperaceae Carex 158 Rare G S1 Very rare sedge known from decomposita 3 only 2 other localities in Texas (Keith 158) Cyperaceae Carex Occasional flaccosperma Cyperaceae Carex frankii Uncommon Cyperaceae Carex 154 Rare hyalinolepis (Keith 154) Cyperaceae Carex Common leavenworthii Cyperaceae Carex lupulina Uncommon Cyperaceae Carex meadii 149 Rare (Keith 149) Cyperaceae Carex Occasional G S4 Restricted to blackland microdonta 4 prairies Cyperaceae Carex oxylepsis 117 Uncommon (Keith 117) Cyperaceae Carex reniformis 157, Rare (Keith 157) 535 Cyperaceae Carex striatula 119 Uncommon (Keith 119) Cyperaceae Carex texensis 116 Occasional (Keith 116) Cyperaceae Carex triangularis 536 Occasional Cyperaceae Carex tribuloides 152 Uncommon (Keith 152) Cyperaceae Cyperus 38 Rare compressus (Keith 38) Cyperaceae Cyperus 262 Occasional