Family per Family per Native Exotic Total Woody/ Genus Common Name Origin USDA Robinson'02 Lep spp Lep spp Lep spp Herb. Caprifoliaceae Caprifoliaceae Abelia abelia alien 1 0 1 w Malvaceae Malvaceae Abelmoschus okra alien 11 0 11 h Pinaceae Pinaceae Abies fir native 113 4 117 w Malvaceae Malvaceae Abutilon indian mallow, velvet leaf alien 4 1 5 h Fabaceae Leguminosae Acacia acacia, wattle native 10 1 11 w Euphorbiaceae Euphorbiaceae Acalypha copperleaf native 3 0 3 h Asteraceae Asteraceae Acanthospermum starburr native 0 0 0 h Aceraceae Aceraceae Acer maple, boxelder native 287 10 297 w Asteraceae Compositae Achillea yarrow, sneezeweed native 20 1 21 h Amaranthaceae Amaranthaceae Achyranthes chaff flower alien 0 0 0 h Calyceraceae Calyceraceae Acicarpha acicarpha alien 0 0 0 h Lamiaceae Lamiaceae Acinos basil thyme alien 0 0 0 h Asteraceae Asteraceae Acmella spotflower alien 0 0 0 h Ranunculaceae Ranunculaceae Aconitum monkshood native 3 0 3 h Acoraceae Acoraceae Acorus sweetflag native 0 0 0 h Ranunculaceae Ranunculaceae Actaea baneberry, bugbane native 4 0 4 h Pteridaceae Adiantaceae Adiantum maidenhair fern native 0 0 0 h Fumariaceae Fumariaceae Adlumia Allegheny vine native 0 0 0 w Ranunculaceae Ranunculaceae Adonis muskroot, pheasant's eye alien 0 0 0 h Adoxaceae Adoxaceae Adoxa adoxa native 0 0 0 h Poaceae Poaceae Aegilops goatgrass alien 0 0 0 h Apiaceae Umbelliferae Aegopodium goutweed alien 1 0 1 h Fabaceae Leguminosae Aeschynomene shyleaf, jointvetch native 1 0 1 h Hippocastanaceae Hippocastanaceae Aesculus horsechestnut, buckeye native 32 0 32 w Scrophulariaceae Scrophulariaceae Agalinis false foxglove, gerardia native 4 0 4 h Lamiaceae Labiatae Agastache hyssop native 2 0 2 h Asteraceae Compositae Ageratina snakeroot native 4 1 5 h Asteraceae Compositae Ageratum white weed, ageratum alien 7 0 7 h Rosaceae Rosaceae Agrimonia agrimony, churchsteeples native 1 0 1 h Poaceae Gramineae Agropyron wheat grass alien 8 0 8 h Caryophyllaceae Caryophyllaceae Agrostemma corncockle alien 0 0 0 h Poaceae Gramineae Agrostis bent grass native 4 1 5 h Simaroubaceae Simaroubaceae Ailanthus ailanthus, tree of heaven alien 4 2 6 w Poaceae Poaceae Aira hairgrass alien 0 0 0 h Lamiaceae Lamiaceae Ajuga bugle alien 0 0 0 h Fabaceae Leguminosae Albizia albizia, silktree alien 3 2 5 w Malvaceae Malvaceae Alcea hollyhock alien 19 3 22 h Rosaceae Rubiaceae Alchemilla lady's mantel alien 1 0 1 h Liliaceae Liliaceae Aletris colicroot native 0 0 0 h Alismataceae Alismataceae Alisma water plantain native 0 0 0 h Brassicaceae Brassicaceae Alliaria garlic mustard alien 0 0 0 h Liliaceae Alliaceae Allium onion native 20 1 21 h Poaceae Poaceae Alloteropsis summergrass alien 0 0 0 h Betulaceae Betulaceae Alnus alder native 248 7 255 w Poaceae Gramineae Alopecurus foxtail native 1 1 2 h Amaranthaceae Amaranthaceae Alternanthera calicoplant, joyweed native 4 0 4 h Malvaceae Malvaceae Althaea marshmallow alien 4 1 5 h Fabaceae Leguminosae Alysicarpus moneywort alien 1 0 1 h Brassicaceae Cruciferae Alyssum madwort alien 2 0 2 h Amaranthaceae Amaranthaceae Amaranthus pigweed, amaranth native 29 0 29 h Asteraceae Compositae Ambrosia ragweed native 46 2 48 h Rosaceae Rosaceae Amelanchier serviceberry, juneberry, shadbushnative 119 5 124 w Orchidaceae Orchidaceae Amerorchis roundleaf orchid native 0 0 0 h Liliaceae Liliaceae Amianthium flypoison native 0 0 0 h Lythraceae Lythraceae Ammannia redstem native 0 0 0 h Apiaceae Apiaceae Ammi toothpickweed, large bullwort alien 0 0 0 h Poaceae Poaceae Ammophila beachgrass native 0 0 0 h Fabaceae Leguminosae Amorpha false indigo, indigobush, leadplantnative 23 1 24 h Vitaceae Vitaceae Ampelopsis peppervine, ampelops native 13 0 13 w Asteraceae Compositae Amphiachyris broomweed native 1 0 1 h 1 Fabaceae Leguminosae Amphicarpaea hogpeanut native 7 0 7 h Poaceae Poaceae Amphicarpum maidencane native 0 0 0 h Boraginaceae Boraginaceae Amsinckia fiddleneck native 0 0 0 h Apocynaceae Apocynaceae Amsonia bluestar native 1 0 1 h Asteraceae Asteraceae Anacyclus whitebuttons alien 0 0 0 h Primulaceae Primulaceae Anagallis pimpernel, chaffweed native 2 0 2 h Asteraceae Compositae Anaphalis pearly everlasting native 7 0 7 h Boraginaceae Boraginaceae Anchusa bugloss alien 0 1 1 h Acanthaceae Acanthaceae Andrographis false waterwillow alien 0 0 0 h Ericaceae Ericaceae Andromeda bog rosemary native 7 0 7 w Poaceae Gramineae Andropogon bluestem, broomsedge bluestem native 11 0 11 h Primulaceae Primulaceae Androsace rockjasmine alien 0 0 0 h Ranunculaceae Ranunculaceae Anemone anemone, thimbleweed native 1 0 1 h Apiaceae Umbelliferae Anethum dill alien 1 0 1 h Apiaceae Umbelliferae Angelica angelica native 5 0 5 h Malvaceae Malvaceae Anoda anoda native 0 0 0 h Asteraceae Compositae Antennaria pussytoes native 6 0 6 h Asteraceae Compositae Anthemis chamomile alien 2 1 3 h Poaceae Poaceae Anthoxanthum vernalgrass native 0 0 0 h Apiaceae Umbelliferae Anthriscus chervil alien 1 0 1 h Fabaceae Fabaceae Anthyllis kidneyvetch alien 0 0 0 h Scrophulariaceae Scrophulariaceae Antirrhinum snapdragon alien 7 0 7 h Poaceae Poaceae Apera silkybent alien 0 0 0 h Rosaceae Rosaceae Aphanes parsley piert alien 0 0 0 h Fabaceae Leguminosae Apios groundnut native 4 0 4 h Apiaceae Umbelliferae Apium celery alien 27 3 30 h Orchidaceae Orchidaceae Aplectrum Adam and Eve native 0 0 0 h Poaceae Poaceae Apluda Mauritian grass alien 0 0 0 h Apocynaceae Apocynaceae Apocynum dogbane native 22 0 22 h Ranunculaceae Ranunculaceae Aquilegia columbine native 12 0 12 h Brassicaceae Brassicaceae Arabidopsis mouseear cress, rock cress alien 0 0 0 h Brassicaceae Cruciferae Arabis rockcress native 7 0 7 h Fabaceae Leguminosae Arachis peanut alien 9 4 13 h Araliaceae Araliaceae Aralia devil's walkingstick, spikenard, sarsaparillanative 7 1 8 h Ericaceae Ericaceae Arbutus madrone alien 11 1 12 w Viscaceae Viscaceae Arceuthobium dwarf mistletoe native 0 0 0 w Asteraceae Compositae Arctium burdock alien 26 1 27 h Ericaceae Ericaceae Arctostaphylos bearberry, kinnikinnick, manzanitanative 15 2 17 w Caryophyllaceae Caprifoliaceae Arenaria sandwort native 1 0 1 h Orchidaceae Orchidaceae Arethusa dragon's mouth native 0 0 0 h Papaveraceae Papaveraceae Argemone pricklypoppy native 1 0 1 h Rosaceae Rosaceae Argentina silverweed native 0 0 0 h Araceae Araceae Arisaema jack-in-the-pulpit, cobralily, arisaemanative 1 0 1 h Poaceae Gramineae Aristida threeawn native 1 0 1 h Aristolochiaceae Aristolochiaceae Aristolochia pipevine, snakeroot, birthwort, dutchman'snative pipe 1 0 1 h Plumbaginaceae Plumbaginaceae Armeria thrift seapink native 0 0 0 h Brassicaceae Cruciferae Armoracia horseradish alien 5 0 5 h Asteraceae Asteraceae Arnica arnica native 0 0 0 h Asteraceae Compositae Arnoglossum cacalia, Indian plaintain native 2 0 2 h Asteraceae Asteraceae Arnoseris lamb succory alien 0 0 0 h Poaceae Poaceae Arrhenatherum oatgrass alien 0 0 0 h Asteraceae Compositae Artemisia sagebrush, wormwood native 11 1 12 h Poaceae Poaceae Arthraxon carpgrass alien 0 0 0 h Rosaceae Rosaceae Aruncus bride's feathers, goatsbeard? native 2 0 2 h Poaceae Gramineae Arundinaria switchcane native 8 0 8 h Poaceae Gramineae Arundo giant reed alien 3 0 3 h Aristolochiaceae Aristolochiaceae Asarum wildginger native 0 0 0 h Asclepiadaceae Asclepiadaceae Asclepias milkweed, butterfly weed native 12 0 12 h Annonaceae Annonaceae Asimina pawpaw native 12 0 12 w Liliaceae Asparagaceae Asparagus asparagus, asparagus fern alien 31 1 32 h Boraginaceae Boraginaceae Asperugo German-madwort alien 0 0 0 h Rubiaceae Rubiaceae Asperula woodruff alien 2 0 2 h 2 Aspleniaceae Aspleniaceae Asplenium spleenwort native 0 0 0 h Asteraceae Compositae Aster aster native 105 4 109 h Saxifragaceae Saxifragaceae Astilbe false goats beard native 0 0 0 h Fabaceae Leguminosae Astragalus milkvetch native 13 2 15 h Dryopteridaceae Woodsiaceae Athyrium ladyfern native 3 0 3 h Chenopodiaceae Chenopodiaceae Atriplex saltbush native 3 2 5 h Solanaceae Solanaceae Atropa belledonna alien 8 0 8 h Scrophulariaceae Scrophulariaceae Aureolaria false foxglove native 4 0 4 h Brassicaceae Brassicaceae Aurinia basket of gold, goldentuft alien 0 0 0 h Poaceae Gramineae Avena oat alien 19 3 22 h Poaceae Poaceae Avenula downy alpine oatgrass alien 0 0 0 h Poaceae Gramineae Axonopus carpetgrass native 2 0 2 h Chenopodiaceae Chenopodiaceae Axyris Russian pigweed alien 0 0 0 h Azollaceae Azollaceae Azolla mosquitofern native 0 0 0 h Asteraceae Compositae Baccharis baccharis native 20 1 21 h Scrophulariaceae Scrophulariaceae Bacopa waterhyssop native 1 0 1 h Asteraceae Asteraceae Bahia bahia alien 0 0 0 h Lamiaceae Lamiaceae Ballota horehound alien 0 0 0 h Poaceae Gramineae Bambusa bamboo alien 1 0 1 w Fabaceae Leguminosae Baptisia indigo, wild indigo native 15 2 17 h Brassicaceae Cruciferae Barbarea yellowrocket, wintercress alien 6 0 6 h Gentianaceae Gentianaceae Bartonia screwstem native 0 0 0 h Chenopodiaceae Chenopodiaceae Bassia smotherweed alien 0 0 0 h Poaceae Poaceae Beckmannia sloughgrass native 0 0 0 h Iridaceae Iridaceae Belamcanda blackberry lily alien 1 0 1 h Asteraceae Compositae Bellis bellis, lawndaisy alien 1 0 1 h Berberidaceae Berberidaceae Berberis barberry native 11 1 12 w Rhamnaceae Rhamnaceae Berchemia supplejack native 0 0 0 w Brassicaceae Berteroa false madwort alien 0 0 0 h Apiaceae Berula waterparsnip native 0 0 0 h Chenopodiaceae Chenopodiaceae Beta beet, beetroot alien 38 6 44 h Betulaceae Betulaceae Betula birch native 400 11 411 w Asteraceae Compositae Bidens beggers ticks native 15 0 15 h Lamiaceae Blephilia pagoda-plant native