List of Maine Plants
| Plant Name | Scientific Name | Plant CD | Family | Type |
|---|---|---|---|---|
| Aaron"s rod | Thermopsis villosa | THVI | Fabaceae | Dicot |
| absinthium | Artemisia absinthium | ARAB3 | Asteraceae | Dicot |
| Acadian quillwort | Isoetes acadiensis | ISAC | Isoetaceae | Quillwort |
| acinos | Acinos | ACINO | Lamiaceae | Dicot |
| actinidia | Actinidia | ACTIN3 | Actinidiaceae | Dicot |
| Adam and Eve | Aplectrum | APLEC | Orchidaceae | Monocot |
| Adam and Eve | Aplectrum hyemale | APHY | Orchidaceae | Monocot |
| adder"s-mouth orchid | Malaxis | MALAX | Orchidaceae | Monocot |
| addersmeat | Stellaria holostea | STHO2 | Caryophyllaceae | Dicot |
| adderstongue | Ophioglossum | OPHIO | Ophioglossaceae | Fern |
| Adirondack blackberry | Rubus lawrencei | RULA7 | Rosaceae | Dicot |
| adlumia | Adlumia | ADLUM | Fumariaceae | Dicot |
| adorned hawthorn | Crataegus compta | CRCO7 | Rosaceae | Dicot |
| aethusa | Aethusa | AETHU | Apiaceae | Dicot |
| agrimony | Agrimonia | AGRIM | Rosaceae | Dicot |
| agueweed | Gentianella quinquefolia | GEQU2 | Gentianaceae | Dicot |
| agueweed | Gentianella quinquefolia ssp. quinquefolia | GEQUQ | Gentianaceae | Dicot |
| ailanthus | Ailanthus | AILAN | Simaroubaceae | Dicot |
| alder | Alnus | ALNUS | Betulaceae | Dicot |
| alderleaf buckthorn | Rhamnus alnifolia | RHAL | Rhamnaceae | Dicot |
| Aleutian maidenhair | Adiantum aleuticum | ADAL | Pteridaceae | Fern |
| alfalfa | Medicago | MEDIC | Fabaceae | Dicot |
| alfalfa | Medicago sativa | MESA | Fabaceae | Dicot |
| alfalfa | Medicago sativa ssp. sativa | MESAS | Fabaceae | Dicot |
| alkali buttercup | Ranunculus cymbalaria | RACY | Ranunculaceae | Dicot |
| alkaligrass | Puccinellia | PUCCI | Poaceae | Monocot |
| Allegheny blackberry | Rubus allegheniensis | RUAL | Rosaceae | Dicot |
| Allegheny blackberry | Rubus allegheniensis var. allegheniensis | RUALA | Rosaceae | Dicot |
| Allegheny hawkweed | Hieracium paniculatum | HIPA2 | Asteraceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens | MIRI | Scrophulariaceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens var. colpophilus | MIRIC | Scrophulariaceae | Dicot |
| Allegheny monkeyflower | Mimulus ringens var. ringens | MIRIR | Scrophulariaceae | Dicot |
| Allegheny serviceberry | Amelanchier laevis | AMLA | Rosaceae | Dicot |
| allegheny vine | Adlumia fungosa | ADFU | Fumariaceae | Dicot |
| alliaria | Alliaria | ALLIA | Brassicaceae | Dicot |
| allseed | Radiola linoides | RALI | Linaceae | Dicot |
| alpine arctic cudweed | Omalotheca supina | OMSU | Asteraceae | Dicot |
| alpine azalea | Loiseleuria procumbens | LOPR | Ericaceae | Dicot |
| alpine bearberry | Arctostaphylos alpina | ARAL2 | Ericaceae | Dicot |
| alpine bearberry | Arctostaphylos alpina var. alpina | ARALA7 | Ericaceae | Dicot |
| alpine bistort | Polygonum viviparum | POVI3 | Polygonaceae | Dicot |
| alpine bittercress | Cardamine bellidifolia | CABE | Brassicaceae | Dicot |
| alpine bittercress | Cardamine bellidifolia var. bellidifolia | CABEB | Brassicaceae | Dicot |
| alpine bulrush | Trichophorum alpinum | TRAL7 | Cyperaceae | Monocot |
| alpine fescue | Festuca brachyphylla | FEBR | Poaceae | Monocot |
| alpine fescue | Festuca brachyphylla ssp. brachyphylla | FEBRB | Poaceae | Monocot |
| alpine milkvetch | Astragalus alpinus | ASAL7 | Fabaceae | Dicot |
| alpine milkvetch | Astragalus alpinus var. brunetianus | ASALB | Fabaceae | Dicot |
| alpine pondweed | Potamogeton alpinus | POAL8 | Potamogetonaceae | Monocot |
| alpine rattlesnakeroot | Prenanthes boottii | PRBO2 | Asteraceae | Dicot |
| alpine rockcress | Arabis alpina | ARAL8 | Brassicaceae | Dicot |
| alpine sweetgrass | Anthoxanthum monticola | ANMO7 | Poaceae | Monocot |
| alpine sweetgrass | Anthoxanthum monticola ssp. alpinum | ANMOA3 | Poaceae | Monocot |
| alpine sweetgrass | Anthoxanthum monticola ssp. monticola | ANMOM2 | Poaceae | Monocot |
| alpine sweetvetch | Hedysarum alpinum | HEAL | Fabaceae | Dicot |
| alpine timothy | Phleum alpinum | PHAL2 | Poaceae | Monocot |
| alpine violet | Viola labradorica | VILA10 | Violaceae | Dicot |
| alpine woodsia | Woodsia alpina | WOAL | Dryopteridaceae | Fern |
| alsike clover | Trifolium hybridum | TRHY | Fabaceae | Dicot |
| alternateflower watermilfoil | Myriophyllum alterniflorum | MYAL3 | Haloragaceae | Dicot |
| alternateleaf dogwood | Cornus alternifolia | COAL2 | Cornaceae | Dicot |
| amberboa | Amberboa | AMBER | Asteraceae | Dicot |
| amberique-bean | Strophostyles helvola | STHE9 | Fabaceae | Dicot |
| American alpine speedwell | Veronica wormskjoldii | VEWO2 | Scrophulariaceae | Dicot |
| American alpine speedwell | Veronica wormskjoldii var. wormskjoldii | VEWOW | Scrophulariaceae | Dicot |
| American basswood | Tilia americana | TIAM | Tiliaceae | Dicot |
| American basswood | Tilia americana var. americana | TIAMA | Tiliaceae | Dicot |
| American basswood | Tilia americana var. heterophylla | TIAMH | Tiliaceae | Dicot |
| American beachgrass | Ammophila breviligulata | AMBR | Poaceae | Monocot |
| American beech | Fagus grandifolia | FAGR | Fagaceae | Dicot |
| American bittersweet | Celastrus scandens | CESC | Celastraceae | Dicot |
| American black currant | Ribes americanum | RIAM2 | Grossulariaceae | Dicot |
| American black elderberry | Sambucus nigra ssp. canadensis | SANIC4 | Caprifoliaceae | Dicot |
| American burnweed | Erechtites hieraciifolia | ERHI2 | Asteraceae | Dicot |
| American burnweed | Erechtites hieraciifolia var. hieraciifolia | ERHIH | Asteraceae | Dicot |
| American bur-reed | Sparganium americanum | SPAM | Sparganiaceae | Monocot |
| American cancer-root | Conopholis americana | COAM | Orobanchaceae | Dicot |
| American chestnut | Castanea dentata | CADE12 | Fagaceae | Dicot |
| American common reed | Phragmites australis ssp. americanus | PHAUA6 | Poaceae | Monocot |
| American cranberrybush | Viburnum opulus var. americanum | VIOPA2 | Caprifoliaceae | Dicot |
| American cupscale | Sacciolepis striata | SAST | Poaceae | Monocot |
| American dragonhead | Dracocephalum parviflorum | DRPA2 | Lamiaceae | Dicot |
| American dunegrass | Leymus mollis | LEMO8 | Poaceae | Monocot |
| American dunegrass | Leymus mollis ssp. mollis | LEMOM2 | Poaceae | Monocot |
| American eelgrass | Vallisneria americana | VAAM3 | Hydrocharitaceae | Monocot |
| American elm | Ulmus americana | ULAM | Ulmaceae | Dicot |
| American false pennyroyal | Hedeoma pulegioides | HEPU | Lamiaceae | Dicot |
| American featherfoil | Hottonia inflata | HOIN | Primulaceae | Dicot |
| American fly honeysuckle | Lonicera canadensis | LOCA7 | Caprifoliaceae | Dicot |
| American ginseng | Panax quinquefolius | PAQU | Araliaceae | Dicot |
| American golden saxifrage | Chrysosplenium americanum | CHAM2 | Saxifragaceae | Dicot |
| American hazelnut | Corylus americana | COAM3 | Betulaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata | AMBR2 | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. bracteata | AMBRB | Fabaceae | Dicot |
| American hogpeanut | Amphicarpaea bracteata var. comosa | AMBRC | Fabaceae | Dicot |
| American holly | Ilex opaca | ILOP | Aquifoliaceae | Dicot |
| American holly | Ilex opaca var. opaca | ILOPO | Aquifoliaceae | Dicot |
| American hornbeam | Carpinus caroliniana | CACA18 | Betulaceae | Dicot |
| American hornbeam | Carpinus caroliniana ssp. virginiana | CACAV | Betulaceae | Dicot |
| American licorice | Glycyrrhiza lepidota | GLLE3 | Fabaceae | Dicot |
| American lopseed | Phryma leptostachya | PHLE5 | Verbenaceae | Dicot |
| American lotus | Nelumbo lutea | NELU | Nelumbonaceae | Dicot |
| American mannagrass | Glyceria grandis | GLGR | Poaceae | Monocot |
| American mannagrass | Glyceria grandis var. grandis | GLGRG | Poaceae | Monocot |
| American marshpennywort | Hydrocotyle americana | HYAM | Apiaceae | Dicot |
| American milletgrass | Milium effusum | MIEF | Poaceae | Monocot |
| American milletgrass | Milium effusum var. cisatlanticum | MIEFC | Poaceae | Monocot |
| American mountain ash | Sorbus americana | SOAM3 | Rosaceae | Dicot |
| American plum | Prunus americana | PRAM | Rosaceae | Dicot |
| American pokeweed | Phytolacca americana | PHAM4 | Phytolaccaceae | Dicot |
| American pokeweed | Phytolacca americana var. americana | PHAMA3 | Phytolaccaceae | Dicot |
| American red raspberry | Rubus idaeus | RUID | Rosaceae | Dicot |
| American red raspberry | Rubus idaeus ssp. idaeus | RUIDI | Rosaceae | Dicot |
| American searocket | Cakile edentula | CAED | Brassicaceae | Dicot |
| American searocket | Cakile edentula ssp. edentula | CAEDE | Brassicaceae | Dicot |
| American searocket | Cakile edentula ssp. edentula var. edentula | CAEDE2 | Brassicaceae | Dicot |
| American senna | Senna hebecarpa | SEHE3 | Fabaceae | Dicot |
| American shoreweed | Littorella uniflora | LIUN | Plantaginaceae | Dicot |
| American sloughgrass | Beckmannia syzigachne | BESY | Poaceae | Monocot |
| American speedwell | Veronica americana | VEAM2 | Scrophulariaceae | Dicot |
| American spikenard | Aralia racemosa | ARRA | Araliaceae | Dicot |
| American spikenard | Aralia racemosa ssp. racemosa | ARRAR | Araliaceae | Dicot |
| American spurred gentian | Halenia deflexa | HADE2 | Gentianaceae | Dicot |
| American spurred gentian | Halenia deflexa ssp. deflexa | HADED2 | Gentianaceae | Dicot |
| American stickseed | Hackelia deflexa var. americana | HADEA | Boraginaceae | Dicot |
| American sycamore | Platanus occidentalis | PLOC | Platanaceae | Dicot |
| American water horehound | Lycopus americanus | LYAM | Lamiaceae | Dicot |
| American water plantain | Alisma subcordatum | ALSU | Alismataceae | Monocot |
| American waterawlwort | Subularia aquatica var. americana | SUAQA2 | Brassicaceae | Dicot |
| American waterwort | Elatine americana | ELAM3 | Elatinaceae | Dicot |
| American white waterlily | Nymphaea odorata | NYOD | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. odorata | NYODO | Nymphaeaceae | Dicot |
| American white waterlily | Nymphaea odorata ssp. tuberosa | NYODT | Nymphaeaceae | Dicot |
| American wintergreen | Pyrola americana | PYAM | Pyrolaceae | Dicot |
| American witchhazel | Hamamelis virginiana | HAVI4 | Hamamelidaceae | Dicot |
| American woollyfruit sedge | Carex lasiocarpa var. americana | CALAA | Cyperaceae | Monocot |
| American yellowrocket | Barbarea orthoceras | BAOR | Brassicaceae | Dicot |
| amerorchis | Amerorchis | AMERO | Orchidaceae | Monocot |
| Amur maple | Acer ginnala | ACGI | Aceraceae | Dicot |
| Amur privet | Ligustrum amurense | LIAM | Oleaceae | Dicot |
| Amur silvergrass | Miscanthus sacchariflorus | MISA | Poaceae | Monocot |
| anemone | Anemone | ANEMO | Ranunculaceae | Dicot |
| angelica | Angelica | ANGEL | Apiaceae | Dicot |
| annual bluegrass | Poa annua | POAN | Poaceae | Monocot |
| annual canarygrass | Phalaris canariensis | PHCA5 | Poaceae | Monocot |
| annual candytuft | Iberis amara | IBAM | Brassicaceae | Dicot |
| annual fescue | Vulpia myuros | VUMY | Poaceae | Monocot |
| annual hairgrass | Deschampsia danthonioides | DEDA | Poaceae | Monocot |
| annual hedgenettle | Stachys annua | STAN | Lamiaceae | Dicot |
| annual honesty | Lunaria annua | LUAN | Brassicaceae | Dicot |
| annual marsh elder | Iva annua | IVAN2 | Asteraceae | Dicot |
| annual marsh elder | Iva annua var. annua | IVANA | Asteraceae | Dicot |
| annual mercury | Mercurialis annua | MEAN | Euphorbiaceae | Dicot |
| annual rabbitsfoot grass | Polypogon monspeliensis | POMO5 | Poaceae | Monocot |
| annual ragweed | Ambrosia artemisiifolia | AMAR2 | Asteraceae | Dicot |
| annual ragweed | Ambrosia artemisiifolia var. artemisiifolia | AMARA2 | Asteraceae | Dicot |
| annual ragweed | Ambrosia artemisiifolia var. elatior | AMARE | Asteraceae | Dicot |
| annual ragweed | Ambrosia artemisiifolia var. paniculata | AMARP | Asteraceae | Dicot |
| annual seepweed | Suaeda linearis | SULI | Chenopodiaceae | Dicot |
| annual vernalgrass | Anthoxanthum aristatum | ANAR7 | Poaceae | Monocot |
| annual wallrocket | Diplotaxis muralis | DIMU2 | Brassicaceae | Dicot |
| annual water minerslettuce | Montia fontana | MOFO | Portulacaceae | Dicot |
| annual wildrice | Zizania aquatica | ZIAQ | Poaceae | Monocot |
| annual wildrice | Zizania aquatica var. aquatica | ZIAQA2 | Poaceae | Monocot |
| annual yellow sweetclover | Melilotus indicus | MEIN2 | Fabaceae | Dicot |
| Anticosti Island aster | Symphyotrichum anticostense | SYAN3 | Asteraceae | Dicot |
| Appalachia false bindweed | Calystegia sepium ssp. appalachiana | CASEA4 | Convolvulaceae | Dicot |
| Appalachian barren strawberry | Waldsteinia fragarioides | WAFR | Rosaceae | Dicot |
| Appalachian barren strawberry | Waldsteinia fragarioides ssp. fragarioides | WAFRF | Rosaceae | Dicot |
| Appalachian clubmoss | Huperzia appalachiana | HUAP | Lycopodiaceae | Lycopod |
| Appalachian polypody | Polypodium appalachianum | POAP | Polypodiaceae | Fern |
| Appalachian quillwort | Isoetes engelmannii | ISEN | Isoetaceae | Quillwort |
| Appalachian sedge | Carex appalachica | CAAP5 | Cyperaceae | Monocot |
| Appalachian stitchwort | Minuartia glabra | MIGL5 | Caryophyllaceae | Dicot |
| apple | Malus | MALUS | Rosaceae | Dicot |
| apple mint | Mentha suaveolens | MESU5 | Lamiaceae | Dicot |
| apple of Peru | Nicandra physalodes | NIPH | Solanaceae | Dicot |
| arborvitae | Thuja | THUJA | Cupressaceae | Gymnosperm |
| arborvitae | Thuja occidentalis | THOC2 | Cupressaceae | Gymnosperm |
| arching dewberry | Rubus recurvicaulis | RURE2 | Rosaceae | Dicot |
| arctic brome | Bromus kalmii | BRKA2 | Poaceae | Monocot |
| arctic cudweed | Omalotheca | OMALO | Asteraceae | Dicot |
| arctic raspberry | Rubus arcticus | RUAR | Rosaceae | Dicot |
| arctic rattlebox | Rhinanthus minor ssp. groenlandicus | RHMIG | Scrophulariaceae | Dicot |
| arctic reedgrass | Calamagrostis coarctata | CACO71 | Poaceae | Monocot |
| arctic rush | Juncus arcticus | JUAR2 | Juncaceae | Monocot |
| arctic sweet coltsfoot | Petasites frigidus | PEFR5 | Asteraceae | Dicot |
| arctic sweet coltsfoot | Petasites frigidus var. palmatus | PEFRP | Asteraceae | Dicot |
| armoracia | Armoracia | ARMOR | Brassicaceae | Dicot |
| arnica | Arnica | ARNIC | Asteraceae | Dicot |
| Arnold hawthorn | Crataegus ×anomala | CRAN6 | Rosaceae | Dicot |
| arnoseris | Arnoseris | ARNOS | Asteraceae | Dicot |
| arrow arum | Peltandra | PELTA | Araceae | Monocot |
| arrowgrass | Triglochin | TRIGL | Juncaginaceae | Monocot |
| arrowhead | Sagittaria | SAGIT | Alismataceae | Monocot |
| arrowleaf tearthumb | Polygonum sagittatum | POSA5 | Polygonaceae | Dicot |
| arrowleaf violet | Viola sagittata | VISA2 | Violaceae | Dicot |
| arrowleaf violet | Viola sagittata var. ovata | VISAO | Violaceae | Dicot |
| arrowleaf violet | Viola sagittata var. sagittata | VISAS5 | Violaceae | Dicot |
| arumleaf arrowhead | Sagittaria cuneata | SACU | Alismataceae | Monocot |
| aruncus | Aruncus | ARUNC | Rosaceae | Dicot |
| ash | Fraxinus | FRAXI | Oleaceae | Dicot |
| ashy sunflower | Helianthus mollis | HEMO2 | Asteraceae | Dicot |
| Asian white birch | Betula platyphylla | BEPL2 | Betulaceae | Dicot |
| Asian white birch | Betula platyphylla var. platyphylla | BEPLP | Betulaceae | Dicot |
| Asiatic dayflower | Commelina communis | COCO3 | Commelinaceae | Monocot |
| asparagus | Asparagus | ASPAR | Liliaceae | Monocot |
| aster | Eurybia | EURYB | Asteraceae | Dicot |
| aster | Ionactis | IONAC | Asteraceae | Dicot |
| aster | Oclemena | OCLEM | Asteraceae | Dicot |
| aster | Oclemena ×blakei | OCBL | Asteraceae | Dicot |
| aster | Symphyotrichum | SYMPH4 | Asteraceae | Dicot |
| Atlantic goldenrod | Solidago arguta | SOAR | Asteraceae | Dicot |
| Atlantic goldenrod | Solidago arguta var. arguta | SOARA | Asteraceae | Dicot |
| Atlantic mannagrass | Glyceria obtusa | GLOB | Poaceae | Monocot |
| Atlantic sphagnum | Sphagnum atlanticum | SPAT3 | Sphagnaceae | Moss |
| Atlantic white cedar | Chamaecyparis thyoides | CHTH2 | Cupressaceae | Gymnosperm |
| auricled twayblade | Listera auriculata | LIAU2 | Orchidaceae | Monocot |
| Australian waterbuttons | Cotula australis | COAU3 | Asteraceae | Dicot |
| Austrian pine | Pinus nigra | PINI | Pinaceae | Gymnosperm |
| autumn coralroot | Corallorhiza odontorhiza | COOD7 | Orchidaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza var. odontorhiza | COODO2 | Orchidaceae | Monocot |
| autumn coralroot | Corallorhiza odontorhiza var. pringlei | COODP2 | Orchidaceae | Monocot |
| autumn dwarf gentian | Gentianella amarella | GEAM3 | Gentianaceae | Dicot |
| autumn dwarf gentian | Gentianella amarella ssp. acuta | GEAMA | Gentianaceae | Dicot |
| autumn olive | Elaeagnus umbellata | ELUM | Elaeagnaceae | Dicot |
| autumn olive | Elaeagnus umbellata var. parvifolia | ELUMP | Elaeagnaceae | Dicot |
| avens | Geum | GEUM | Rosaceae | Dicot |
| awlfruit sedge | Carex stipata | CAST5 | Cyperaceae | Monocot |
| awlwort | Subularia | SUBUL | Brassicaceae | Dicot |
| azure bluet | Houstonia caerulea | HOCA4 | Rubiaceae | Dicot |
| baby"s breath | Gypsophila paniculata | GYPA | Caryophyllaceae | Dicot |
| baby"s-breath | Gypsophila | GYPSO | Caryophyllaceae | Dicot |
| Back"s sedge | Carex backii | CABA3 | Cyperaceae | Monocot |
| Bailey"s sedge | Carex baileyi | CABA7 | Cyperaceae | Monocot |
| bald brome | Bromus racemosus | BRRA2 | Poaceae | Monocot |
| bald spikerush | Eleocharis erythropoda | ELER | Cyperaceae | Monocot |
| Balkan catchfly | Silene csereii | SICS | Caryophyllaceae | Dicot |
| ballmustard | Neslia paniculata | NEPA3 | Brassicaceae | Dicot |
| balm | Melissa | MELIS | Lamiaceae | Dicot |
| balm-of-Gilead | Populus ×jackii | POJA2 | Salicaceae | Dicot |
| balsam fir | Abies balsamea | ABBA | Pinaceae | Gymnosperm |
| balsam fir | Abies balsamea var. balsamea | ABBAB | Pinaceae | Gymnosperm |
| balsam fir | Abies balsamea var. phanerolepis | ABBAP | Pinaceae | Gymnosperm |
| balsam groundsel | Packera paupercula | PAPA20 | Asteraceae | Dicot |
| balsam poplar | Populus balsamifera | POBA2 | Salicaceae | Dicot |
| balsam poplar | Populus balsamifera ssp. balsamifera | POBAB2 | Salicaceae | Dicot |
| balsam willow | Salix pyrifolia | SAPY | Salicaceae | Dicot |
| baneberry | Actaea | ACTAE | Ranunculaceae | Dicot |
| barberry | Berberis | BERBE | Berberidaceae | Dicot |
| barley | Hordeum | HORDE | Poaceae | Monocot |
| barnyardgrass | Echinochloa crus-galli | ECCR | Poaceae | Monocot |
| barren strawberry | Waldsteinia | WALDS | Rosaceae | Dicot |
| bashful bulrush | Trichophorum planifolium | TRPL6 | Cyperaceae | Monocot |
| basil thyme | Acinos arvensis | ACAR2 | Lamiaceae | Dicot |
| basket willow | Salix viminalis | SAVI2 | Salicaceae | Dicot |
| basswood | Tilia | TILIA | Tiliaceae | Dicot |
| bastard toadflax | Comandra | COMAN | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata | COUM | Santalaceae | Dicot |
| bastard toadflax | Comandra umbellata ssp. umbellata | COUMU | Santalaceae | Dicot |
| bats in the belfry | Campanula trachelium | CATR4 | Campanulaceae | Dicot |
| bay forget-me-not | Myosotis laxa | MYLA | Boraginaceae | Dicot |
| bayberry | Morella | MOREL2 | Myricaceae | Dicot |
| bayberry willow | Salix myricoides | SAMY2 | Salicaceae | Dicot |
| bayberry willow | Salix myricoides var. myricoides | SAMYM | Salicaceae | Dicot |
| bayonet rush | Juncus militaris | JUMI2 | Juncaceae | Monocot |
| beach pea | Lathyrus japonicus | LAJA | Fabaceae | Dicot |
| beach pea | Lathyrus japonicus var. maritimus | LAJAM | Fabaceae | Dicot |
| beach pea | Lathyrus japonicus var. pellitus | LAJAP2 | Fabaceae | Dicot |
| beach pinweed | Lechea maritima | LEMA | Cistaceae | Dicot |
| beach pinweed | Lechea maritima var. maritima | LEMAM | Cistaceae | Dicot |
| beach plum | Prunus maritima | PRMA2 | Rosaceae | Dicot |
| beach plum | Prunus maritima var. maritima | PRMAM | Rosaceae | Dicot |
| beach sedge | Carex silicea | CASI6 | Cyperaceae | Monocot |
| beachgrass | Ammophila | AMMOP | Poaceae | Monocot |
| beachhead iris | Iris setosa | IRSE | Iridaceae | Monocot |
| beaked hazelnut | Corylus cornuta | COCO6 | Betulaceae | Dicot |
| beaked hazelnut | Corylus cornuta var. cornuta | COCOC2 | Betulaceae | Dicot |
| beaked spikerush | Eleocharis rostellata | ELRO2 | Cyperaceae | Monocot |
| beaksedge | Rhynchospora | RHYNC3 | Cyperaceae | Monocot |
| bean | Phaseolus | PHASE | Fabaceae | Dicot |
| bear oak | Quercus ilicifolia | QUIL | Fagaceae | Dicot |
| bearberry willow | Salix uva-ursi | SAUV | Salicaceae | Dicot |
| beard lichen | Usnea | USNEA2 | Parmeliaceae | Lichen |
| bearded beggarticks | Bidens aristosa | BIAR | Asteraceae | Dicot |
| bearded flatsedge | Cyperus squarrosus | CYSQ | Cyperaceae | Monocot |
| bearded sprangletop | Leptochloa fusca ssp. fascicularis | LEFUF | Poaceae | Monocot |
| beardtongue | Penstemon | PENST | Scrophulariaceae | Dicot |
| beautiful sandwort | Minuartia rubella | MIRU3 | Caryophyllaceae | Dicot |
| Bebb willow | Salix bebbiana | SABE2 | Salicaceae | Dicot |
| Bebb"s sedge | Carex bebbii | CABE2 | Cyperaceae | Monocot |
| Beck"s water-marigold | Bidens beckii | BIBE2 | Asteraceae | Dicot |
| bedstraw | Galium | GALIU | Rubiaceae | Dicot |
| beebalm | Monarda | MONAR | Lamiaceae | Dicot |
| beech | Fagus | FAGUS | Fagaceae | Dicot |
| beechdrops | Epifagus | EPIFA | Orobanchaceae | Dicot |
| beechdrops | Epifagus virginiana | EPVI2 | Orobanchaceae | Dicot |
| beechfern | Phegopteris | PHEGO | Thelypteridaceae | Fern |
| beet | Beta | BETA | Chenopodiaceae | Dicot |
| beggarslice | Hackelia virginiana | HAVI2 | Boraginaceae | Dicot |
| beggarticks | Bidens | BIDEN | Asteraceae | Dicot |
| bellflower | Campanula | CAMPA | Campanulaceae | Dicot |
| bellis | Bellis | BELLI | Asteraceae | Dicot |
| bellwort | Uvularia | UVULA | Liliaceae | Monocot |
| bentgrass | Agrostis | AGROS2 | Poaceae | Monocot |
| Bicknell"s cranesbill | Geranium bicknellii | GEBI2 | Geraniaceae | Dicot |
| Bicknell"s sedge | Carex bicknellii | CABI3 | Cyperaceae | Monocot |
| biennial wormwood | Artemisia biennis | ARBI2 | Asteraceae | Dicot |
| biennial wormwood | Artemisia biennis var. biennis | ARBIB | Asteraceae | Dicot |
| big blue birch | Betula ×caerulea var. grandis | BECAG | Betulaceae | Dicot |
| big bluestem | Andropogon gerardii | ANGE | Poaceae | Monocot |
| big chickweed | Cerastium fontanum ssp. vulgare | CEFOV2 | Caryophyllaceae | Dicot |
| big devils beggartick | Bidens vulgata | BIVU | Asteraceae | Dicot |
| bigbract verbena | Verbena bracteata | VEBR | Verbenaceae | Dicot |
| Bigelow"s sedge | Carex bigelowii | CABI5 | Cyperaceae | Monocot |
| bigfruit hawthorn | Crataegus macrosperma | CRMA3 | Rosaceae | Dicot |
| bigleaf aster | Eurybia macrophylla | EUMA27 | Asteraceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus | LUPO2 | Fabaceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus ssp. polyphyllus | LUPOP2 | Fabaceae | Dicot |
| bigleaf lupine | Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | LUPOP4 | Fabaceae | Dicot |
| bigtooth aspen | Populus grandidentata | POGR4 | Salicaceae | Dicot |
| Billings" Sedge | Carex billingsii | CABI22 | Cyperaceae | Monocot |
| billion-dollar grass | Echinochloa frumentacea | ECFR | Poaceae | Monocot |
| bindweed | Convolvulus | CONVO | Convolvulaceae | Dicot |
| birch | Betula | BETUL | Betulaceae | Dicot |
| bird vetch | Vicia cracca | VICR | Fabaceae | Dicot |
| bird vetch | Vicia cracca ssp. cracca | VICRC | Fabaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus | LOCO6 | Fabaceae | Dicot |
| bird"s-foot trefoil | Lotus corniculatus var. corniculatus | LOCOC5 | Fabaceae | Dicot |
| birdeye pearlwort | Sagina procumbens | SAPR | Caryophyllaceae | Dicot |
| birdeye primrose | Primula laurentiana | PRLA | Primulaceae | Dicot |
| birdeye speedwell | Veronica persica | VEPE3 | Scrophulariaceae | Dicot |
| birdfoot violet | Viola pedata | VIPE | Violaceae | Dicot |
| bishop"s goutweed | Aegopodium podagraria | AEPO | Apiaceae | Dicot |
| bitter dock | Rumex obtusifolius | RUOB | Polygonaceae | Dicot |
| bitter fleabane | Erigeron acris | ERAC2 | Asteraceae | Dicot |
| bitter fleabane | Erigeron acris ssp. politus | ERACP2 | Asteraceae | Dicot |
| bitter rubberweed | Hymenoxys odorata | HYOD | Asteraceae | Dicot |
| bittercress | Cardamine | CARDA | Brassicaceae | Dicot |
| bitternut hickory | Carya cordiformis | CACO15 | Juglandaceae | Dicot |
| bittersweet | Celastrus | CELAS | Celastraceae | Dicot |
| black ash | Fraxinus nigra | FRNI | Oleaceae | Dicot |
| black baneberry | Actaea racemosa | ACRA7 | Ranunculaceae | Dicot |
| black bindweed | Polygonum convolvulus | POCO10 | Polygonaceae | Dicot |
| black bindweed | Polygonum convolvulus var. convolvulus | POCOC2 | Polygonaceae | Dicot |
| black bindweed | Polygonum convolvulus var. subulatum | POCOS | Polygonaceae | Dicot |
| black bugbane | Actaea racemosa var. racemosa | ACRAR | Ranunculaceae | Dicot |
| black cherry | Prunus serotina | PRSE2 | Rosaceae | Dicot |
| black cherry | Prunus serotina var. serotina | PRSES | Rosaceae | Dicot |
| black chokeberry | Photinia melanocarpa | PHME13 | Rosaceae | Dicot |
| black elderberry | Sambucus nigra | SANI4 | Caprifoliaceae | Dicot |
| black henbane | Hyoscyamus niger | HYNI | Solanaceae | Dicot |
| black highbush blueberry | Vaccinium fuscatum | VAFU | Ericaceae | Dicot |
| black huckleberry | Gaylussacia baccata | GABA | Ericaceae | Dicot |
| black locust | Robinia pseudoacacia | ROPS | Fabaceae | Dicot |
| black medick | Medicago lupulina | MELU | Fabaceae | Dicot |
| black mustard | Brassica nigra | BRNI | Brassicaceae | Dicot |
| black nightshade | Solanum nigrum | SONI | Solanaceae | Dicot |
| black oak | Quercus velutina | QUVE | Fagaceae | Dicot |
| black raspberry | Rubus occidentalis | RUOC | Rosaceae | Dicot |
| black spruce | Picea mariana | PIMA | Pinaceae | Gymnosperm |
| black walnut | Juglans nigra | JUNI | Juglandaceae | Dicot |
| black willow | Salix nigra | SANI | Salicaceae | Dicot |
| blackberry | Rubus | RUBUS | Rosaceae | Dicot |
| blackeyed Susan | Rudbeckia hirta | RUHI2 | Asteraceae | Dicot |
| blackeyed Susan | Rudbeckia hirta var. hirta | RUHIH | Asteraceae | Dicot |
| blackeyed Susan | Rudbeckia hirta var. pulcherrima | RUHIP | Asteraceae | Dicot |
| blackgirdle bulrush | Scirpus atrocinctus | SCAT4 | Cyperaceae | Monocot |
| blackgum | Nyssa sylvatica | NYSY | Cornaceae | Dicot |
| blackseed plantain | Plantago rugelii | PLRU | Plantaginaceae | Dicot |
| blackseed plantain | Plantago rugelii var. rugelii | PLRUR | Plantaginaceae | Dicot |
| blackseed ricegrass | Patis racemosa | PARA2 | Poaceae | Monocot |
| blackthorn | Prunus spinosa | PRSP | Rosaceae | Dicot |
| bladder campion | Silene latifolia | SILA21 | Caryophyllaceae | Dicot |
| bladder campion | Silene latifolia ssp. alba | SILAA3 | Caryophyllaceae | Dicot |
| bladderfern | Cystopteris | CYSTO | Dryopteridaceae | Fern |
| bladderwort | Utricularia | UTRIC | Lentibulariaceae | Dicot |
| blanketflower | Gaillardia | GAILL | Asteraceae | Dicot |
| blazing star | Liatris | LIATR | Asteraceae | Dicot |
| bleeding heart | Lamprocapnos | LAMPR2 | Fumariaceae | Dicot |
| bleeding heart | Lamprocapnos spectabilis | LASP8 | Fumariaceae | Dicot |
| bleeding heart | Dicentra | DICEN | Fumariaceae | Dicot |
| blister sedge | Carex vesicaria | CAVE6 | Cyperaceae | Monocot |
| blisterwort | Ranunculus recurvatus | RARE2 | Ranunculaceae | Dicot |
| blisterwort | Ranunculus recurvatus var. recurvatus | RARER2 | Ranunculaceae | Dicot |
| blite goosefoot | Chenopodium capitatum | CHCA4 | Chenopodiaceae | Dicot |
| bloodroot | Sanguinaria | SANGU | Papaveraceae | Dicot |
| bloodroot | Sanguinaria canadensis | SACA13 | Papaveraceae | Dicot |
| bloody geranium | Geranium sanguineum | GESA2 | Geraniaceae | Dicot |
| blue birch | Betula ×caerulea | BECA4 | Betulaceae | Dicot |
| blue birch | Betula ×caerulea var. caerulea | BECAC | Betulaceae | Dicot |
| blue bugle | Ajuga genevensis | AJGE | Lamiaceae | Dicot |
| blue cohosh | Caulophyllum thalictroides | CATH2 | Berberidaceae | Dicot |
| blue fieldmadder | Sherardia arvensis | SHAR2 | Rubiaceae | Dicot |
| blue flax | Linum perenne | LIPE2 | Linaceae | Dicot |
| blue grama | Bouteloua gracilis | BOGR2 | Poaceae | Monocot |
| blue lettuce | Lactuca tatarica | LATA | Asteraceae | Dicot |
| blue lettuce | Lactuca tatarica var. pulchella | LATAP | Asteraceae | Dicot |
| blue mountainheath | Phyllodoce caerulea | PHCA10 | Ericaceae | Dicot |
| Blue Ridge blueberry | Vaccinium pallidum | VAPA4 | Ericaceae | Dicot |
| Blue Ridge sedge | Carex lucorum | CALU17 | Cyperaceae | Monocot |
| Blue Ridge sedge | Carex lucorum var. lucorum | CALUL | Cyperaceae | Monocot |
| blue skullcap | Scutellaria lateriflora | SCLA2 | Lamiaceae | Dicot |
| blue skullcap | Scutellaria lateriflora var. lateriflora | SCLAL2 | Lamiaceae | Dicot |
| blue spruce | Picea pungens | PIPU | Pinaceae | Gymnosperm |
| bluebead | Clintonia | CLINT | Liliaceae | Monocot |
| bluebead | Clintonia borealis | CLBO3 | Liliaceae | Monocot |
| bluebell bellflower | Campanula rotundifolia | CARO2 | Campanulaceae | Dicot |
| bluebells | Mertensia | MERTE | Boraginaceae | Dicot |
| blueberry | Vaccinium | VACCI | Ericaceae | Dicot |
| bluecurls | Trichostema | TRICH9 | Lamiaceae | Dicot |
| blue-eyed grass | Sisyrinchium | SISYR | Iridaceae | Monocot |
| bluegrass | Poa | POA | Poaceae | Monocot |
| bluejacket | Tradescantia ohiensis | TROH | Commelinaceae | Monocot |
| bluejoint | Calamagrostis canadensis | CACA4 | Poaceae | Monocot |
| bluejoint | Calamagrostis canadensis var. canadensis | CACAC10 | Poaceae | Monocot |
| bluestem | Andropogon | ANDRO2 | Poaceae | Monocot |
| bluet | Houstonia | HOUST | Rubiaceae | Dicot |
| blunt broom sedge | Carex tribuloides | CATR7 | Cyperaceae | Monocot |
| blunt broom sedge | Carex tribuloides var. tribuloides | CATRT2 | Cyperaceae | Monocot |
| blunt spikerush | Eleocharis obtusa | ELOB2 | Cyperaceae | Monocot |
| bluntleaf bedstraw | Galium obtusum | GAOB | Rubiaceae | Dicot |
| bluntleaf bedstraw | Galium obtusum ssp. obtusum | GAOBO | Rubiaceae | Dicot |
| bluntleaf pondweed | Potamogeton obtusifolius | POOB2 | Potamogetonaceae | Monocot |
| bluntleaf sandwort | Moehringia lateriflora | MOLA6 | Caryophyllaceae | Dicot |
| bluntleaved orchid | Platanthera obtusata | PLOB | Orchidaceae | Monocot |
| bluntleaved orchid | Platanthera obtusata ssp. obtusata | PLOBO3 | Orchidaceae | Monocot |
| bluntlobe cliff fern | Woodsia obtusa | WOOB2 | Dryopteridaceae | Fern |
| bluntlobe cliff fern | Woodsia obtusa ssp. obtusa | WOOBO | Dryopteridaceae | Fern |
| bluntlobe grapefern | Botrychium oneidense | BOON | Ophioglossaceae | Fern |
| bluntseed sweetroot | Osmorhiza depauperata | OSDE | Apiaceae | Dicot |
| bog aster | Oclemena nemoralis | OCNE2 | Asteraceae | Dicot |
| bog birch | Betula pumila | BEPU4 | Betulaceae | Dicot |
| bog birch | Betula pumila var. pumila | BEPUP2 | Betulaceae | Dicot |
| bog birch | Betula pumila var. renifolia | BEPUR | Betulaceae | Dicot |
| bog blueberry | Vaccinium uliginosum | VAUL | Ericaceae | Dicot |
| bog chickweed | Stellaria alsine | STAL4 | Caryophyllaceae | Dicot |
| bog fern | Thelypteris simulata | THSI2 | Thelypteridaceae | Fern |
| bog goldenrod | Solidago uliginosa | SOUL | Asteraceae | Dicot |
| bog goldenrod | Solidago uliginosa var. linoides | SOULL2 | Asteraceae | Dicot |
| bog goldenrod | Solidago uliginosa var. terrae-novae | SOULT | Asteraceae | Dicot |
| bog goldenrod | Solidago uliginosa var. uliginosa | SOULU | Asteraceae | Dicot |
| bog Labrador tea | Ledum groenlandicum | LEGR | Ericaceae | Dicot |
| bog laurel | Kalmia polifolia | KAPO | Ericaceae | Dicot |
| bog muhly | Muhlenbergia uniflora | MUUN | Poaceae | Monocot |
| bog rosemary | Andromeda | ANDRO | Ericaceae | Dicot |
| bog rosemary | Andromeda polifolia | ANPO | Ericaceae | Dicot |
| bog rosemary | Andromeda polifolia var. glaucophylla | ANPOG | Ericaceae | Dicot |
| bog white violet | Viola lanceolata | VILA4 | Violaceae | Dicot |
| bog white violet | Viola lanceolata ssp. lanceolata | VILAL | Violaceae | Dicot |
| bog willow | Salix pedicellaris | SAPE2 | Salicaceae | Dicot |
| bog willowherb | Epilobium leptophyllum | EPLE2 | Onagraceae | Dicot |
| bog yellowcress | Rorippa palustris | ROPA2 | Brassicaceae | Dicot |
| bog yelloweyed grass | Xyris difformis | XYDI | Xyridaceae | Monocot |
| bog yelloweyed grass | Xyris difformis var. difformis | XYDID | Xyridaceae | Monocot |
| borage | Borago | BORAG | Boraginaceae | Dicot |
| boreal bedstraw | Galium kamtschaticum | GAKA | Rubiaceae | Dicot |
| boreal bog sedge | Carex magellanica | CAMA12 | Cyperaceae | Monocot |
| boreal bog sedge | Carex magellanica ssp. irrigua | CAMAI2 | Cyperaceae | Monocot |
| boreal starwort | Stellaria borealis | STBO3 | Caryophyllaceae | Dicot |
| boreal starwort | Stellaria borealis ssp. borealis | STBOB | Caryophyllaceae | Dicot |
| boreal yarrow | Achillea millefolium var. borealis | ACMIB | Asteraceae | Dicot |
| Boston ivy | Parthenocissus tricuspidata | PATR6 | Vitaceae | Dicot |
| bottle gentian | Gentiana clausa | GECL | Gentianaceae | Dicot |
| bottlebrush sedge | Carex hystericina | CAHY4 | Cyperaceae | Monocot |
| bouncingbet | Saponaria officinalis | SAOF4 | Caryophyllaceae | Dicot |
| box knotweed | Polygonum buxiforme | POBU2 | Polygonaceae | Dicot |
| boxelder | Acer negundo | ACNE2 | Aceraceae | Dicot |
| boxelder | Acer negundo var. negundo | ACNEN | Aceraceae | Dicot |
| boxelder | Acer negundo var. violaceum | ACNEV | Aceraceae | Dicot |
| brackenfern | Pteridium | PTERI | Dennstaedtiaceae | Fern |
| Brainerd"s hawthorn | Crataegus brainerdii | CRBR3 | Rosaceae | Dicot |
| branched bur-reed | Sparganium androcladum | SPAN | Sparganiaceae | Monocot |
| branched centaury | Centaurium pulchellum | CEPU3 | Gentianaceae | Dicot |
| brasenia | Brasenia | BRASE | Cabombaceae | Dicot |
| Braun"s hollyfern | Polystichum braunii | POBR4 | Dryopteridaceae | Fern |
| bride"s feathers | Aruncus dioicus | ARDI8 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. dioicus | ARDID2 | Rosaceae | Dicot |
| bride"s feathers | Aruncus dioicus var. vulgaris | ARDIV | Rosaceae | Dicot |
| bright green spikerush | Eleocharis olivacea | ELOL | Cyperaceae | Monocot |
| bright green spikerush | Eleocharis olivacea var. olivacea | ELOLO | Cyperaceae | Monocot |
| brightblue speedwell | Veronica serpyllifolia ssp. humifusa | VESEH2 | Scrophulariaceae | Dicot |
| brightgreen spleenwort | Asplenium trichomanes-ramosum | ASTR10 | Aspleniaceae | Fern |
| bristle berry | Rubus notatus | RUNO2 | Rosaceae | Dicot |
| bristlegrass | Setaria | SETAR | Poaceae | Monocot |
| bristleleaf sedge | Carex eburnea | CAEB2 | Cyperaceae | Monocot |
| bristly buttercup | Ranunculus hispidus | RAHI | Ranunculaceae | Dicot |
| bristly buttercup | Ranunculus hispidus var. caricetorum | RAHIC | Ranunculaceae | Dicot |
| bristly dewberry | Rubus hispidus | RUHI | Rosaceae | Dicot |
| bristly locust | Robinia hispida | ROHI | Fabaceae | Dicot |
| bristly locust | Robinia hispida var. hispida | ROHIH | Fabaceae | Dicot |
| bristly Oswego blackberry | Rubus dissimilis | RUDI3 | Rosaceae | Dicot |
| bristly oxtongue | Picris echioides | PIEC | Asteraceae | Dicot |
| bristly sarsaparilla | Aralia hispida | ARHI2 | Araliaceae | Dicot |
| bristlystalked sedge | Carex leptalea | CALE10 | Cyperaceae | Monocot |
| bristlystalked sedge | Carex leptalea ssp. leptalea | CALEL4 | Cyperaceae | Monocot |
| British soldier lichen | Cladonia cristatella | CLCR2 | Cladoniaceae | Lichen |
| brittle bladderfern | Cystopteris fragilis | CYFR2 | Dryopteridaceae | Fern |
| brittlestem hempnettle | Galeopsis tetrahit | GATE2 | Lamiaceae | Dicot |
| brittlestem hempnettle | Galeopsis tetrahit var. tetrahit | GATET2 | Lamiaceae | Dicot |
| broad beechfern | Phegopteris hexagonoptera | PHHE11 | Thelypteridaceae | Fern |
| broad looseflower sedge | Carex laxiflora | CALA19 | Cyperaceae | Monocot |
| broad looseflower sedge | Carex laxiflora var. laxiflora | CALAL5 | Cyperaceae | Monocot |
| broadfruit bur-reed | Sparganium eurycarpum | SPEU | Sparganiaceae | Monocot |
| broadleaf arrowhead | Sagittaria latifolia | SALA2 | Alismataceae | Monocot |
| broadleaf cattail | Typha latifolia | TYLA | Typhaceae | Monocot |
| broadleaf enchanter"s nightshade | Circaea lutetiana | CILU | Onagraceae | Dicot |
| broadleaf enchanter"s nightshade | Circaea lutetiana ssp. canadensis | CILUC | Onagraceae | Dicot |
| broadleaf helleborine | Epipactis helleborine | EPHE | Orchidaceae | Monocot |
| broadleaf rosette grass | Dichanthelium latifolium | DILA8 | Poaceae | Monocot |
| broadleaf sedge | Carex platyphylla | CAPL5 | Cyperaceae | Monocot |
| broadleaf speedwell | Veronica austriaca | VEAU | Scrophulariaceae | Dicot |
| broadleaf speedwell | Veronica austriaca ssp. teucrium | VEAUT | Scrophulariaceae | Dicot |
| broadlipped twayblade | Listera convallarioides | LICO5 | Orchidaceae | Monocot |
| brome | Bromus | BROMU | Poaceae | Monocot |
| brome fescue | Vulpia bromoides | VUBR | Poaceae | Monocot |
| brome-like sedge | Carex bromoides | CABR14 | Cyperaceae | Monocot |
| brome-like sedge | Carex bromoides ssp. bromoides | CABRB6 | Cyperaceae | Monocot |
| brook cinquefoil | Potentilla rivalis | PORI3 | Rosaceae | Dicot |
| brookweed | Samolus | SAMOL | Primulaceae | Dicot |
| broom | Cytisus | CYTIS | Fabaceae | Dicot |
| broom | Genista | GENIS | Fabaceae | Dicot |
| broom crowberry | Corema conradii | COCO9 | Empetraceae | Dicot |
| broom sedge | Carex scoparia | CASC11 | Cyperaceae | Monocot |
| broom sedge | Carex scoparia var. scoparia | CASCS | Cyperaceae | Monocot |
| broom sedge | Carex scoparia var. tessellata | CASCT | Cyperaceae | Monocot |
| broomcorn millet | Panicum miliaceum ssp. miliaceum | PAMIM | Poaceae | Monocot |
| broomrape | Orobanche | OROBA | Orobanchaceae | Dicot |
| brown beaksedge | Rhynchospora fusca | RHFU | Cyperaceae | Monocot |
| brown mustard | Brassica juncea | BRJU | Brassicaceae | Dicot |
| brownfruit rush | Juncus pelocarpus | JUPE | Juncaceae | Monocot |
| brownish beaksedge | Rhynchospora capitellata | RHCA12 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens | CABR15 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens ssp. brunnescens | CABRB3 | Cyperaceae | Monocot |
| brownish sedge | Carex brunnescens ssp. sphaerostachya | CABRS | Cyperaceae | Monocot |
| brownray knapweed | Centaurea jacea | CEJA | Asteraceae | Dicot |
| buckbean | Menyanthes | MENYA | Menyanthaceae | Dicot |
| buckbean | Menyanthes trifoliata | METR3 | Menyanthaceae | Dicot |
| buckeye | Aesculus | AESCU | Hippocastanaceae | Dicot |
| buckthorn | Frangula | FRANG | Rhamnaceae | Dicot |
| buckthorn | Rhamnus | RHAMN | Rhamnaceae | Dicot |
| buckwheat | Fagopyrum | FAGOP2 | Polygonaceae | Dicot |
| buckwheat | Fagopyrum esculentum | FAES2 | Polygonaceae | Dicot |
| buffaloberry | Shepherdia | SHEPH | Elaeagnaceae | Dicot |
| buffalobur nightshade | Solanum rostratum | SORO | Solanaceae | Dicot |
| bugle | Ajuga | AJUGA | Lamiaceae | Dicot |
| bugloss | Anchusa | ANCHU | Boraginaceae | Dicot |
| buglossoides | Buglossoides | BUGLO | Boraginaceae | Dicot |
| bulblet bladderfern | Cystopteris bulbifera | CYBU3 | Dryopteridaceae | Fern |
| bulblet-bearing water hemlock | Cicuta bulbifera | CIBU | Apiaceae | Dicot |
| bull thistle | Cirsium vulgare | CIVU | Asteraceae | Dicot |
| bulrush | Scirpus ×peckii | SCPE2 | Cyperaceae | Monocot |
| bulrush | Scirpus | SCIRP | Cyperaceae | Monocot |
| bulrush | Schoenoplectus ×steinmetzii | SCST10 | Cyperaceae | Monocot |
| bulrush | Schoenoplectiella | SCHOE7 | Cyperaceae | Monocot |
| bulrush | Schoenoplectus | SCHOE6 | Cyperaceae | Monocot |
| bulrush | Trichophorum | TRICH22 | Cyperaceae | Monocot |
| bunchberry dogwood | Cornus canadensis | COCA13 | Cornaceae | Dicot |
| bur cucumber | Sicyos | SICYO | Cucurbitaceae | Dicot |
| bur grass | Tragus | TRAGU | Poaceae | Monocot |
| bur oak | Quercus macrocarpa | QUMA2 | Fagaceae | Dicot |
| bur oak | Quercus macrocarpa var. macrocarpa | QUMAM | Fagaceae | Dicot |
| burclover | Medicago polymorpha | MEPO3 | Fabaceae | Dicot |
| burdock | Arctium | ARCTI | Asteraceae | Dicot |
| burnet | Sanguisorba | SANGU2 | Rosaceae | Dicot |
| burnet saxifrage | Pimpinella | PIMPI | Apiaceae | Dicot |
| burningbush | Bassia scoparia | BASC5 | Chenopodiaceae | Dicot |
| burningbush | Euonymus atropurpureus | EUAT5 | Celastraceae | Dicot |
| burnweed | Erechtites | ERECH | Asteraceae | Dicot |
| bur-reed | Sparganium | SPARG | Sparganiaceae | Monocot |
| bur-reed sedge | Carex sparganioides | CASP3 | Cyperaceae | Monocot |
| bush honeysuckle | Diervilla | DIERV | Caprifoliaceae | Dicot |
| bush vetch | Vicia sepium | VISE | Fabaceae | Dicot |
| bush vetch | Vicia sepium var. montana | VISEM8 | Fabaceae | Dicot |
| bush vetch | Vicia sepium var. sepium | VISES | Fabaceae | Dicot |
| Bush"s goosefoot | Chenopodium berlandieri var. bushianum | CHBEB3 | Chenopodiaceae | Dicot |
| Bush"s sedge | Carex bushii | CABU5 | Cyperaceae | Monocot |
| bushy knotweed | Polygonum ramosissimum | PORA3 | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. prolificum | PORAP | Polygonaceae | Dicot |
| bushy knotweed | Polygonum ramosissimum var. ramosissimum | PORAR | Polygonaceae | Dicot |
| butomus | Butomus | BUTOM | Butomaceae | Monocot |
| butter and eggs | Linaria vulgaris | LIVU2 | Scrophulariaceae | Dicot |
| butterbur | Petasites | PETAS | Asteraceae | Dicot |
| buttercup | Ranunculus | RANUN | Ranunculaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa | ASTU | Asclepiadaceae | Dicot |
| butterfly milkweed | Asclepias tuberosa ssp. tuberosa | ASTUT2 | Asclepiadaceae | Dicot |
| butternut | Juglans cinerea | JUCI | Juglandaceae | Dicot |
| butterwort | Pinguicula | PINGU | Lentibulariaceae | Dicot |
| button sedge | Carex bullata | CABU7 | Cyperaceae | Monocot |
| buttonbush | Cephalanthus | CEPHA | Rubiaceae | Dicot |
| buttonbush dodder | Cuscuta cephalanthi | CUCE | Cuscutaceae | Dicot |
| Buxbaum"s sedge | Carex buxbaumii | CABU6 | Cyperaceae | Monocot |
| cabbage | Brassica oleracea | BROL | Brassicaceae | Dicot |
| calamus | Acorus calamus | ACCA4 | Acoraceae | Monocot |
| calico aster | Symphyotrichum lateriflorum | SYLA4 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. angustifolium | SYLAA | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. horizontale | SYLAH5 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. lateriflorum | SYLAL7 | Asteraceae | Dicot |
| calico aster | Symphyotrichum lateriflorum var. tenuipes | SYLAT | Asteraceae | Dicot |
| California gilia | Gilia achilleifolia | GIAC2 | Polemoniaceae | Dicot |
| California gilia | Gilia achilleifolia ssp. multicaulis | GIACM | Polemoniaceae | Dicot |
| California nettle | Urtica dioica ssp. gracilis | URDIG | Urticaceae | Dicot |
| callalily | Calla | CALLA | Araceae | Monocot |
| callistephus | Callistephus | CALLI8 | Asteraceae | Dicot |
| camphorweed | Pluchea | PLUCH | Asteraceae | Dicot |
| campion | Lychnis | LYCHN | Caryophyllaceae | Dicot |
| Canada beachhead iris | Iris setosa var. canadensis | IRSEC | Iridaceae | Monocot |
| Canada bluegrass | Poa compressa | POCO | Poaceae | Monocot |
| Canada cocklebur | Xanthium strumarium var. canadense | XASTC | Asteraceae | Dicot |
| Canada germander | Teucrium canadense | TECA3 | Lamiaceae | Dicot |
| Canada germander | Teucrium canadense var. canadense | TECAC | Lamiaceae | Dicot |
| Canada goldenrod | Solidago altissima | SOAL6 | Asteraceae | Dicot |
| Canada goldenrod | Solidago canadensis | SOCA6 | Asteraceae | Dicot |
| Canada goldenrod | Solidago canadensis var. canadensis | SOCAC3 | Asteraceae | Dicot |
| Canada lettuce | Lactuca canadensis | LACA | Asteraceae | Dicot |
| Canada lily | Lilium canadense | LICA3 | Liliaceae | Monocot |
| Canada lily | Lilium canadense ssp. canadense | LICAC | Liliaceae | Monocot |
| Canada mayflower | Maianthemum canadense | MACA4 | Liliaceae | Monocot |
| Canada thistle | Cirsium arvense | CIAR4 | Asteraceae | Dicot |
| Canada toadflax | Nuttallanthus canadensis | NUCA | Scrophulariaceae | Dicot |
| Canada wildrye | Elymus canadensis | ELCA4 | Poaceae | Monocot |
| Canada yew | Taxus canadensis | TACA7 | Taxaceae | Gymnosperm |
| Canadian anemone | Anemone canadensis | ANCA8 | Ranunculaceae | Dicot |
| Canadian burnet | Sanguisorba canadensis | SACA14 | Rosaceae | Dicot |
| Canadian clearweed | Pilea pumila | PIPU2 | Urticaceae | Dicot |
| Canadian clearweed | Pilea pumila var. pumila | PIPUP | Urticaceae | Dicot |
| Canadian gooseberry | Ribes oxyacanthoides | RIOX | Grossulariaceae | Dicot |
| Canadian gooseberry | Ribes oxyacanthoides ssp. oxyacanthoides | RIOXO | Grossulariaceae | Dicot |
| Canadian hawkweed | Hieracium canadense | HICA3 | Asteraceae | Dicot |
| Canadian hawkweed | Hieracium canadense var. canadense | HICAC | Asteraceae | Dicot |
| Canadian hawkweed | Hieracium kalmii var. fasciculatum | HIKAF | Asteraceae | Dicot |
| Canadian honewort | Cryptotaenia canadensis | CRCA9 | Apiaceae | Dicot |
| Canadian horseweed | Conyza canadensis | COCA5 | Asteraceae | Dicot |
| Canadian horseweed | Conyza canadensis var. canadensis | COCAC3 | Asteraceae | Dicot |
| Canadian lousewort | Pedicularis canadensis | PECA | Scrophulariaceae | Dicot |
| Canadian lousewort | Pedicularis canadensis ssp. canadensis | PECAC3 | Scrophulariaceae | Dicot |
| Canadian plum | Prunus nigra | PRNI | Rosaceae | Dicot |
| Canadian pussytoes | Antennaria howellii ssp. canadensis | ANHOC | Asteraceae | Dicot |
| Canadian ricegrass | Piptatheropsis canadensis | PICA19 | Poaceae | Monocot |
| Canadian rush | Juncus canadensis | JUCA3 | Juncaceae | Monocot |
| Canadian sandspurry | Spergularia canadensis | SPCA3 | Caryophyllaceae | Dicot |
| Canadian sandspurry | Spergularia canadensis var. canadensis | SPCAC | Caryophyllaceae | Dicot |
| Canadian serviceberry | Amelanchier canadensis | AMCA4 | Rosaceae | Dicot |
| Canadian summer bluet | Houstonia canadensis | HOCA5 | Rubiaceae | Dicot |
| Canadian waterweed | Elodea canadensis | ELCA7 | Hydrocharitaceae | Monocot |
| Canadian white violet | Viola canadensis | VICA4 | Violaceae | Dicot |
| Canadian white violet | Viola canadensis var. canadensis | VICAC | Violaceae | Dicot |
| Canadian wildginger | Asarum canadense | ASCA | Aristolochiaceae | Dicot |
| Canadian woodnettle | Laportea canadensis | LACA3 | Urticaceae | Dicot |
| canary violet | Viola ×primulifolia | VIPR4 | Violaceae | Dicot |
| canarygrass | Phalaris | PHALA2 | Poaceae | Monocot |
| cancer-root | Conopholis | CONOP | Orobanchaceae | Dicot |
| candle anemone | Anemone cylindrica | ANCY | Ranunculaceae | Dicot |
| candytuft | Iberis | IBERI | Brassicaceae | Dicot |
| capsella | Capsella | CAPSE | Brassicaceae | Dicot |
| caraway | Carum carvi | CACA19 | Apiaceae | Dicot |
| cardinalflower | Lobelia cardinalis | LOCA2 | Campanulaceae | Dicot |
| carelessweed | Cyclachaena | CYCLA4 | Asteraceae | Dicot |
| Carelessweed | Cyclachaena xanthiifolia | CYXA2 | Asteraceae | Dicot |
| Carey"s smartweed | Polygonum careyi | POCA8 | Polygonaceae | Dicot |
| Carolina geranium | Geranium carolinianum | GECA5 | Geraniaceae | Dicot |
| Carolina geranium | Geranium carolinianum var. carolinianum | GECAC4 | Geraniaceae | Dicot |
| Carolina geranium | Geranium carolinianum var. sphaerospermum | GECAS | Geraniaceae | Dicot |
| Carolina horsenettle | Solanum carolinense | SOCA3 | Solanaceae | Dicot |
| Carolina horsenettle | Solanum carolinense var. carolinense | SOCAC4 | Solanaceae | Dicot |
| Carolina mosquitofern | Azolla caroliniana | AZCA | Azollaceae | Fern |
| Carolina rose | Rosa carolina | ROCA4 | Rosaceae | Dicot |
| Carolina rose | Rosa carolina var. carolina | ROCAC | Rosaceae | Dicot |
| Carolina rose | Rosa carolina var. setigera | ROCAS2 | Rosaceae | Dicot |
| Carolina springbeauty | Claytonia caroliniana | CLCA | Portulacaceae | Dicot |
| Carolina springbeauty | Claytonia caroliniana var. caroliniana | CLCAC | Portulacaceae | Dicot |
| carpenter"s square | Scrophularia marilandica | SCMA2 | Scrophulariaceae | Dicot |
| carpetweed | Mollugo | MOLLU | Molluginaceae | Dicot |
| Carson"s waterparsnip | Sium carsonii | SICA12 | Apiaceae | Dicot |
| carum | Carum | CARUM | Apiaceae | Dicot |
| Case"s lady"s tresses | Spiranthes casei | SPCA6 | Orchidaceae | Monocot |
| Case"s lady"s tresses | Spiranthes casei var. casei | SPCAC4 | Orchidaceae | Monocot |
| cat"s ear | Hypochaeris | HYPOC | Asteraceae | Dicot |
| catalpa | Catalpa | CATAL | Bignoniaceae | Dicot |
| catberry | Ilex mucronata | ILMU | Aquifoliaceae | Dicot |
| catchfly | Silene ×hampeana | SIHA9 | Caryophyllaceae | Dicot |
| catchfly | Silene | SILEN | Caryophyllaceae | Dicot |
| catnip | Nepeta | NEPET | Lamiaceae | Dicot |
| catnip | Nepeta cataria | NECA2 | Lamiaceae | Dicot |
| cattail | Typha | TYPHA | Typhaceae | Monocot |
| cattail sedge | Carex typhina | CATY | Cyperaceae | Monocot |
| Caucasian stonecrop | Phedimus spurius | PHSP9 | Crassulaceae | Dicot |
| ceanothus | Ceanothus | CEANO | Rhamnaceae | Dicot |
| cedar | Chamaecyparis | CHAMA4 | Cupressaceae | Gymnosperm |
| celandine | Chelidonium | CHELI | Papaveraceae | Dicot |
| celandine | Chelidonium majus | CHMA2 | Papaveraceae | Dicot |
| celandine | Chelidonium majus var. majus | CHMAM | Papaveraceae | Dicot |
| centaury | Centaurium | CENTA2 | Gentianaceae | Dicot |
| cereal rye | Secale cereale | SECE | Poaceae | Monocot |
| chaffy sedge | Carex paleacea | CAPA29 | Cyperaceae | Monocot |
| chainfern | Woodwardia | WOODW | Blechnaceae | Fern |
| chamomile | Anthemis | ANTHE | Asteraceae | Dicot |
| Champlain beachgrass | Ammophila champlainensis | AMCH6 | Poaceae | Monocot |
| charity | Polemonium caeruleum | POCA2 | Polemoniaceae | Dicot |
| charlock mustard | Sinapis arvensis | SIAR4 | Brassicaceae | Dicot |
| cheatgrass | Bromus tectorum | BRTE | Poaceae | Monocot |
| checkered rattlesnake plantain | Goodyera tesselata | GOTE | Orchidaceae | Monocot |
| cheerful sunflower | Helianthus ×laetiflorus | HELA | Asteraceae | Dicot |
| chervil | Anthriscus | ANTHR | Apiaceae | Dicot |
| chestnut | Castanea | CASTA | Fagaceae | Dicot |
| chestnut oak | Quercus montana | QUMO4 | Fagaceae | Dicot |
| chestnut sedge | Carex castanea | CACA16 | Cyperaceae | Monocot |
| Chewing"s fescue | Festuca rubra ssp. fallax | FERUF3 | Poaceae | Monocot |
| chicory | Cichorium intybus | CIIN | Asteraceae | Dicot |
| chicory | Cichorium | CICHO | Asteraceae | Dicot |
| China aster | Callistephus chinensis | CACH25 | Asteraceae | Dicot |
| Chinese desert-thorn | Lycium chinense | LYCH | Solanaceae | Dicot |
| Chinese elm | Ulmus parvifolia | ULPA | Ulmaceae | Dicot |
| chokeberry | Photinia | PHOTI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana | PRVI | Rosaceae | Dicot |
| chokecherry | Prunus virginiana var. virginiana | PRVIV | Rosaceae | Dicot |
| Christmas fern | Polystichum acrostichoides | POAC4 | Dryopteridaceae | Fern |
| Christmas fern | Polystichum acrostichoides var. acrostichoides | POACA | Dryopteridaceae | Fern |
| churchmouse threeawn | Aristida dichotoma | ARDI4 | Poaceae | Monocot |
| churchmouse threeawn | Aristida dichotoma var. dichotoma | ARDID | Poaceae | Monocot |
| cinnamon fern | Osmunda cinnamomea | OSCI | Osmundaceae | Fern |
| cinnamon fern | Osmunda cinnamomea var. cinnamomea | OSCIC | Osmundaceae | Fern |
| cinnamon rose | Rosa cinnamomea | ROCI | Rosaceae | Dicot |
| cinquefoil | Potentilla | POTEN | Rosaceae | Dicot |
| city goosefoot | Chenopodium urbicum | CHUR | Chenopodiaceae | Dicot |
| clammy campion | Lychnis viscaria | LYVI2 | Caryophyllaceae | Dicot |
| clammy groundcherry | Physalis heterophylla | PHHE5 | Solanaceae | Dicot |
| clammy groundcherry | Physalis heterophylla var. heterophylla | PHHEH3 | Solanaceae | Dicot |
| clammy hedgehyssop | Gratiola neglecta | GRNE | Scrophulariaceae | Dicot |
| clammy locust | Robinia viscosa | ROVI | Fabaceae | Dicot |
| clammy locust | Robinia viscosa var. viscosa | ROVIV | Fabaceae | Dicot |
| clasping pepperweed | Lepidium perfoliatum | LEPE2 | Brassicaceae | Dicot |
| clasping Venus" looking-glass | Triodanis perfoliata | TRPE4 | Campanulaceae | Dicot |
| claspingleaf pondweed | Potamogeton perfoliatus | POPE7 | Potamogetonaceae | Monocot |
| claspleaf twistedstalk | Streptopus amplexifolius | STAM2 | Liliaceae | Monocot |
| claspleaf twistedstalk | Streptopus amplexifolius var. amplexifolius | STAMA2 | Liliaceae | Monocot |
| Clayton"s sweetroot | Osmorhiza claytonii | OSCL | Apiaceae | Dicot |
| clearweed | Pilea | PILEA | Urticaceae | Dicot |
| cliff fern | Woodsia | WOODS | Dryopteridaceae | Fern |
| climbing false buckwheat | Polygonum scandens | POSC3 | Polygonaceae | Dicot |
| climbing false buckwheat | Polygonum scandens var. scandens | POSCS | Polygonaceae | Dicot |
| climbing hempvine | Mikania scandens | MISC | Asteraceae | Dicot |
| climbing nightshade | Solanum dulcamara | SODU | Solanaceae | Dicot |
| climbing nightshade | Solanum dulcamara var. dulcamara | SODUD | Solanaceae | Dicot |
| climbing nightshade | Solanum dulcamara var. villosissimum | SODUV | Solanaceae | Dicot |
| clinopodium | Clinopodium | CLINO | Lamiaceae | Dicot |
| Clinton"s bulrush | Trichophorum clintonii | TRCL4 | Cyperaceae | Monocot |
| Clinton"s woodfern | Dryopteris clintoniana | DRCL | Dryopteridaceae | Fern |
| closed gentian | Gentiana rubricaulis | GERU | Gentianaceae | Dicot |
| closedhead sedge | Carex norvegica ssp. inferalpina | CANOI | Cyperaceae | Monocot |
| cloudberry | Rubus chamaemorus | RUCH | Rosaceae | Dicot |
| clover | Trifolium | TRIFO | Fabaceae | Dicot |
| clover dodder | Cuscuta epithymum | CUEP | Cuscutaceae | Dicot |
| club spikemoss | Selaginella selaginoides | SESE | Selaginellaceae | Lycopod |
| clubawn grass | Corynephorus | CORYN | Poaceae | Monocot |
| clubmoss | Lycopodiella ×gilmanii | LYGI2 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodium | LYCOP2 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodiella | LYCOP6 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodium ×zeilleri | LYZE | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodium ×habereri | LYHA2 | Lycopodiaceae | Lycopod |
| clubmoss | Lycopodium ×issleri | LYIS | Lycopodiaceae | Lycopod |
| clubmoss | Huperzia ×buttersii | HUBU | Lycopodiaceae | Lycopod |
| clubmoss | Huperzia | HUPER | Lycopodiaceae | Lycopod |
| cluster mallow | Malva verticillata | MAVE | Malvaceae | Dicot |
| clustered blacksnakeroot | Sanicula odorata | SAOD | Apiaceae | Dicot |
| clustered field sedge | Carex praegracilis | CAPR5 | Cyperaceae | Monocot |
| clustered mountainmint | Pycnanthemum muticum | PYMU | Lamiaceae | Dicot |
| clustered sedge | Carex cumulata | CACU3 | Cyperaceae | Monocot |
| coast tarweed | Madia sativa | MASA | Asteraceae | Dicot |
| coastal jointweed | Polygonella articulata | POAR4 | Polygonaceae | Dicot |
| coastal plain joe pye weed | Eutrochium dubium | EUDU6 | Asteraceae | Dicot |
| coastal sandbur | Cenchrus spinifex | CESP4 | Poaceae | Monocot |
| coastal sedge | Carex exilis | CAEX7 | Cyperaceae | Monocot |
| coastal sweetpepperbush | Clethra alnifolia | CLAL3 | Clethraceae | Dicot |
| cocklebur | Xanthium | XANTH2 | Asteraceae | Dicot |
| cockspur grass | Echinochloa | ECHIN4 | Poaceae | Monocot |
| cockspur hawthorn | Crataegus crus-galli | CRCR2 | Rosaceae | Dicot |
| codlins and cream | Epilobium hirsutum | EPHI | Onagraceae | Dicot |
| coffeetree | Gymnocladus | GYMNO2 | Fabaceae | Dicot |
| cohosh | Caulophyllum | CAULO | Berberidaceae | Dicot |
| colicroot | Aletris | ALETR | Liliaceae | Monocot |
| colonial bentgrass | Agrostis capillaris | AGCA5 | Poaceae | Monocot |
| coltsfoot | Tussilago | TUSSI | Asteraceae | Dicot |
| coltsfoot | Tussilago farfara | TUFA | Asteraceae | Dicot |
| Columbian watermeal | Wolffia columbiana | WOCO | Lemnaceae | Monocot |
| columbine | Aquilegia | AQUIL | Ranunculaceae | Dicot |
| comarum | Comarum | COMAR3 | Rosaceae | Dicot |
| combleaf mermaidweed | Proserpinaca pectinata | PRPE | Haloragaceae | Dicot |
| comfrey | Symphytum | SYMPH2 | Boraginaceae | Dicot |
| common balm | Melissa officinalis | MEOF2 | Lamiaceae | Dicot |
| common barberry | Berberis vulgaris | BEVU | Berberidaceae | Dicot |
| common barley | Hordeum vulgare | HOVU | Poaceae | Monocot |
| common beet | Beta vulgaris | BEVU2 | Chenopodiaceae | Dicot |
| common bladderwort | Utricularia macrorhiza | UTMA | Lentibulariaceae | Dicot |
| common blue violet | Viola sororia | VISO | Violaceae | Dicot |
| common blue wood aster | Symphyotrichum cordifolium | SYCO4 | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum | EUPE3 | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum var. colpophilum | EUPEC | Asteraceae | Dicot |
| common boneset | Eupatorium perfoliatum var. perfoliatum | EUPEP | Asteraceae | Dicot |
| common borage | Borago officinalis | BOOF | Boraginaceae | Dicot |
| common buckthorn | Rhamnus cathartica | RHCA3 | Rhamnaceae | Dicot |
| common bugle | Ajuga reptans | AJRE | Lamiaceae | Dicot |
| common bugloss | Anchusa officinalis | ANOF | Boraginaceae | Dicot |
| common butterwort | Pinguicula vulgaris | PIVU | Lentibulariaceae | Dicot |
| common buttonbush | Cephalanthus occidentalis | CEOC2 | Rubiaceae | Dicot |
| common catchfly | Silene gallica | SIGA | Caryophyllaceae | Dicot |
| common chickweed | Stellaria media | STME2 | Caryophyllaceae | Dicot |
| common chickweed | Stellaria media ssp. media | STMEM | Caryophyllaceae | Dicot |
| common cinquefoil | Potentilla simplex | POSI2 | Rosaceae | Dicot |
| common comfrey | Symphytum officinale | SYOF | Boraginaceae | Dicot |
| common corncockle | Agrostemma githago | AGGI | Caryophyllaceae | Dicot |
| common cowparsnip | Heracleum maximum | HEMA80 | Apiaceae | Dicot |
| common dandelion | Taraxacum officinale | TAOF | Asteraceae | Dicot |
| common dandelion | Taraxacum officinale ssp. ceratophorum | TAOFC | Asteraceae | Dicot |
| common dandelion | Taraxacum officinale ssp. officinale | TAOFO | Asteraceae | Dicot |
| common dogmustard | Erucastrum gallicum | ERGA | Brassicaceae | Dicot |
| common duckmeat | Spirodela polyrrhiza | SPPO | Lemnaceae | Monocot |
| common duckweed | Lemna minor | LEMI3 | Lemnaceae | Monocot |
| common evening primrose | Oenothera biennis | OEBI | Onagraceae | Dicot |
| common eyebright | Euphrasia nemorosa | EUNE3 | Scrophulariaceae | Dicot |
| common fiddleneck | Amsinckia menziesii var. intermedia | AMMEI2 | Boraginaceae | Dicot |
| common flax | Linum usitatissimum | LIUS | Linaceae | Dicot |
| common goldstar | Hypoxis hirsuta | HYHI2 | Liliaceae | Monocot |
| common gypsyweed | Veronica officinalis | VEOF2 | Scrophulariaceae | Dicot |
| common gypsyweed | Veronica officinalis var. officinalis | VEOFO | Scrophulariaceae | Dicot |
| common gypsyweed | Veronica officinalis var. tournefortii | VEOFT | Scrophulariaceae | Dicot |
| common hawkweed | Hieracium lachenalii | HILA8 | Asteraceae | Dicot |
| common hop | Humulus lupulus | HULU | Cannabaceae | Dicot |
| common hop | Humulus lupulus var. lupuloides | HULUL | Cannabaceae | Dicot |
| common hop | Humulus lupulus var. lupulus | HULUL2 | Cannabaceae | Dicot |
| common hoptree | Ptelea trifoliata | PTTR | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. trifoliata | PTTRT | Rutaceae | Dicot |
| common hoptree | Ptelea trifoliata ssp. trifoliata var. trifoliata | PTTRT2 | Rutaceae | Dicot |
| common houseleek | Sempervivum tectorum | SETE5 | Crassulaceae | Dicot |
| common juniper | Juniperus communis | JUCO6 | Cupressaceae | Gymnosperm |
| common juniper | Juniperus communis var. depressa | JUCOD | Cupressaceae | Gymnosperm |
| common ladyfern | Athyrium filix-femina | ATFI | Dryopteridaceae | Fern |
| common lilac | Syringa vulgaris | SYVU | Oleaceae | Dicot |
| common linden | Tilia ×europaea | TIEU4 | Tiliaceae | Dicot |
| common mallow | Malva neglecta | MANE | Malvaceae | Dicot |
| common mare"s-tail | Hippuris vulgaris | HIVU2 | Hippuridaceae | Dicot |
| common marsh bedstraw | Galium palustre | GAPA3 | Rubiaceae | Dicot |
| common milkweed | Asclepias syriaca | ASSY | Asclepiadaceae | Dicot |
| common moonwort | Botrychium lunaria | BOLU | Ophioglossaceae | Fern |
| common motherwort | Leonurus cardiaca | LECA2 | Lamiaceae | Dicot |
| common motherwort | Leonurus cardiaca ssp. cardiaca | LECAC7 | Lamiaceae | Dicot |
| common mouse-ear chickweed | Cerastium fontanum | CEFO2 | Caryophyllaceae | Dicot |
| common mullein | Verbascum thapsus | VETH | Scrophulariaceae | Dicot |
| common ninebark | Physocarpus opulifolius | PHOP | Rosaceae | Dicot |
| common ninebark | Physocarpus opulifolius var. opulifolius | PHOPO | Rosaceae | Dicot |
| common nipplewort | Lapsana communis | LACO3 | Asteraceae | Dicot |
| common oat | Avena sativa | AVSA | Poaceae | Monocot |
| common pear | Pyrus communis | PYCO | Rosaceae | Dicot |
| common pepperweed | Lepidium densiflorum | LEDE | Brassicaceae | Dicot |
| common periwinkle | Vinca minor | VIMI2 | Apocynaceae | Dicot |
| common plantain | Plantago major | PLMA2 | Plantaginaceae | Dicot |
| common pricklyash | Zanthoxylum americanum | ZAAM | Rutaceae | Dicot |
| common reed | Phragmites australis | PHAU7 | Poaceae | Monocot |
| common rush | Juncus effusus | JUEF | Juncaceae | Monocot |
| common rush | Juncus effusus var. conglomeratus | JUEFC2 | Juncaceae | Monocot |
| common rush | Juncus effusus var. effusus | JUEFE2 | Juncaceae | Monocot |
| common rush | Juncus effusus var. pylaei | JUEFP2 | Juncaceae | Monocot |
| common selfheal | Prunella vulgaris | PRVU | Lamiaceae | Dicot |
| common selfheal | Prunella vulgaris ssp. vulgaris | PRVUV | Lamiaceae | Dicot |
| common serviceberry | Amelanchier arborea | AMAR3 | Rosaceae | Dicot |
| common serviceberry | Amelanchier arborea var. arborea | AMARA4 | Rosaceae | Dicot |
| common sheep sorrel | Rumex acetosella | RUAC3 | Polygonaceae | Dicot |
| common sheep sorrel | Rumex ×acutus | RUAC6 | Polygonaceae | Dicot |
| common sneezeweed | Helenium autumnale | HEAU | Asteraceae | Dicot |
| common sneezeweed | Helenium autumnale var. autumnale | HEAUA | Asteraceae | Dicot |
| common snowberry | Symphoricarpos albus | SYAL | Caprifoliaceae | Dicot |
| common snowberry | Symphoricarpos albus var. laevigatus | SYALL | Caprifoliaceae | Dicot |
| common sowthistle | Sonchus oleraceus | SOOL | Asteraceae | Dicot |
| common spikerush | Eleocharis palustris | ELPA3 | Cyperaceae | Monocot |
| common spikerush | Eleocharis palustris var. palustris | ELPAP | Cyperaceae | Monocot |
| common spikerush | Eleocharis palustris var. vigens | ELPAV | Cyperaceae | Monocot |
| common St. Johnswort | Hypericum perforatum | HYPE | Clusiaceae | Dicot |
| common sunflower | Helianthus annuus | HEAN3 | Asteraceae | Dicot |
| common tansy | Tanacetum vulgare | TAVU | Asteraceae | Dicot |
| common threeseed mercury | Acalypha rhomboidea | ACRH | Euphorbiaceae | Dicot |
| common threesquare | Schoenoplectus pungens | SCPU10 | Cyperaceae | Monocot |
| common threesquare | Schoenoplectus pungens var. pungens | SCPUP5 | Cyperaceae | Monocot |
| common velvetgrass | Holcus lanatus | HOLA | Poaceae | Monocot |
| common viper"s bugloss | Echium vulgare | ECVU | Boraginaceae | Dicot |
| common wheat | Triticum aestivum | TRAE | Poaceae | Monocot |
| common winterberry | Ilex verticillata | ILVE | Aquifoliaceae | Dicot |
| common wolfstail | Lycurus phleoides | LYPH | Poaceae | Monocot |
| common woodrush | Luzula multiflora | LUMU2 | Juncaceae | Monocot |
| common woodrush | Luzula multiflora ssp. frigida | LUMUF | Juncaceae | Monocot |
| common woodrush | Luzula multiflora ssp. multiflora | LUMUM | Juncaceae | Monocot |
| common woodrush | Luzula multiflora ssp. multiflora var. acadiensis | LUMUA2 | Juncaceae | Monocot |
| common woodrush | Luzula multiflora ssp. multiflora var. multiflora | LUMUM2 | Juncaceae | Monocot |
| common wormwood | Artemisia vulgaris | ARVU | Asteraceae | Dicot |
| common yarrow | Achillea millefolium var. millefolium | ACMIM2 | Asteraceae | Dicot |
| common yarrow | Achillea millefolium var. nigrescens | ACMIN | Asteraceae | Dicot |
| common yarrow | Achillea millefolium | ACMI2 | Asteraceae | Dicot |
| common yellow oxalis | Oxalis stricta | OXST | Oxalidaceae | Dicot |
| composite dropseed | Sporobolus compositus | SPCO16 | Poaceae | Monocot |
| composite dropseed | Sporobolus compositus var. compositus | SPCOC2 | Poaceae | Monocot |
| Concord hawthorn | Crataegus ideae | CRID | Rosaceae | Dicot |
| cone-cup spikerush | Eleocharis tuberculosa | ELTU | Cyperaceae | Monocot |
| coneflower | Rudbeckia | RUDBE | Asteraceae | Dicot |
| convallaria | Convallaria | CONVA | Liliaceae | Monocot |
| coon"s tail | Ceratophyllum demersum | CEDE4 | Ceratophyllaceae | Dicot |
| copperleaf | Acalypha | ACALY | Euphorbiaceae | Dicot |
| coralroot | Corallorhiza | CORAL5 | Orchidaceae | Monocot |
| cordgrass | Spartina | SPART | Poaceae | Monocot |
| cordgrass | Spartina ×caespitosa | SPCA | Poaceae | Monocot |
| corema | Corema | COREM | Empetraceae | Dicot |
| corn | Zea | ZEA | Poaceae | Monocot |
| corn | Zea mays | ZEMA | Poaceae | Monocot |
| corn | Zea mays ssp. mays | ZEMAM2 | Poaceae | Monocot |
| corn chamomile | Anthemis arvensis | ANAR6 | Asteraceae | Dicot |
| corn gromwell | Buglossoides arvensis | BUAR3 | Boraginaceae | Dicot |
| corn poppy | Papaver rhoeas | PARH2 | Papaveraceae | Dicot |
| corn speedwell | Veronica arvensis | VEAR | Scrophulariaceae | Dicot |
| corn spurry | Spergula arvensis | SPAR | Caryophyllaceae | Dicot |
| corncockle | Agrostemma | AGROS | Caryophyllaceae | Dicot |
| corndaisy | Glebionis segetum | GLSE5 | Asteraceae | Dicot |
| cornsalad | Valerianella | VALER2 | Valerianaceae | Dicot |
| cosmopolitan bulrush | Schoenoplectus maritimus | SCMA8 | Cyperaceae | Monocot |
| cosmos | Cosmos | COSMO | Asteraceae | Dicot |
| costmary | Tanacetum balsamita | TABA | Asteraceae | Dicot |
| cottongrass | Eriophorum | ERIOP | Cyperaceae | Monocot |
| cottonwood | Populus | POPUL | Salicaceae | Dicot |
| cow soapwort | Vaccaria hispanica | VAHI2 | Caryophyllaceae | Dicot |
| cowparsnip | Heracleum | HERAC | Apiaceae | Dicot |
| cowslip primrose | Primula veris | PRVE2 | Primulaceae | Dicot |
| cowwheat | Melampyrum | MELAM2 | Scrophulariaceae | Dicot |
| crabgrass | Digitaria | DIGIT2 | Poaceae | Monocot |
| crack willow | Salix fragilis | SAFR | Salicaceae | Dicot |
| cracked lichen | Acarospora | ACARO2 | Acarosporaceae | Lichen |
| cranberry | Vaccinium macrocarpon | VAMA | Ericaceae | Dicot |
| Crawe"s sedge | Carex crawei | CACR3 | Cyperaceae | Monocot |
| Crawford"s sedge | Carex crawfordii | CACR4 | Cyperaceae | Monocot |
| creamflower rockcress | Arabis hirsuta var. pycnocarpa | ARHIP | Brassicaceae | Dicot |
| creeper | Parthenocissus | PARTH3 | Vitaceae | Dicot |
| creeping baby"s-breath | Gypsophila repens | GYRE | Caryophyllaceae | Dicot |
| creeping bentgrass | Agrostis stolonifera | AGST2 | Poaceae | Monocot |
| creeping buttercup | Ranunculus repens | RARE3 | Ranunculaceae | Dicot |
| creeping jenny | Lysimachia nummularia | LYNU | Primulaceae | Dicot |
| creeping juniper | Juniperus horizontalis | JUHO2 | Cupressaceae | Gymnosperm |
| creeping mannagrass | Glyceria acutiflora | GLAC | Poaceae | Monocot |
| creeping phlox | Phlox stolonifera | PHST3 | Polemoniaceae | Dicot |
| creeping sedge | Carex chordorrhiza | CACH5 | Cyperaceae | Monocot |
| creeping snowberry | Gaultheria hispidula | GAHI2 | Ericaceae | Dicot |
| creeping woodsorrel | Oxalis corniculata | OXCO | Oxalidaceae | Dicot |
| creeping yellowcress | Rorippa sylvestris | ROSY | Brassicaceae | Dicot |
| crested dogstail grass | Cynosurus cristatus | CYCR | Poaceae | Monocot |
| crested latesummer mint | Elsholtzia ciliata | ELCI | Lamiaceae | Dicot |
| crested woodfern | Dryopteris cristata | DRCR4 | Dryopteridaceae | Fern |
| Cretan viper"s bugloss | Echium creticum | ECCR3 | Boraginaceae | Dicot |
| crimson clover | Trifolium incarnatum | TRIN3 | Fabaceae | Dicot |
| crinkleroot | Cardamine diphylla | CADI10 | Brassicaceae | Dicot |
| crossleaf heath | Erica tetralix | ERTE4 | Ericaceae | Dicot |
| crowberry | Empetrum | EMPET | Empetraceae | Dicot |
| crowfoot grass | Dactyloctenium | DACTY2 | Poaceae | Monocot |
| crowndaisy | Glebionis coronarium | GLCO6 | Asteraceae | Dicot |
| crownvetch | Securigera | SECUR3 | Fabaceae | Dicot |
| crownvetch | Securigera varia | SEVA4 | Fabaceae | Dicot |
| cuckoo flower | Cardamine pratensis | CAPR3 | Brassicaceae | Dicot |
| cuckoo flower | Cardamine pratensis var. pratensis | CAPRP | Brassicaceae | Dicot |
| cucumber tree | Magnolia acuminata | MAAC | Magnoliaceae | Dicot |
| cucumberleaf sunflower | Helianthus debilis | HEDE4 | Asteraceae | Dicot |
| cucumberleaf sunflower | Helianthus debilis ssp. cucumerifolius | HEDEC2 | Asteraceae | Dicot |
| cudweed | Gnaphalium | GNAPH | Asteraceae | Dicot |
| cudweed | Pseudognaphalium | PSEUD43 | Asteraceae | Dicot |
| cultivated currant | Ribes rubrum | RIRU80 | Grossulariaceae | Dicot |
| cultivated endive | Cichorium endivia | CIEN | Asteraceae | Dicot |
| cultivated radish | Raphanus sativus | RASA2 | Brassicaceae | Dicot |
| Culver"s root | Veronicastrum virginicum | VEVI4 | Scrophulariaceae | Dicot |
| Cuman ragweed | Ambrosia psilostachya | AMPS | Asteraceae | Dicot |
| cup lichen | Cladonia | CLADO3 | Cladoniaceae | Lichen |
| cup plant | Silphium perfoliatum | SIPE2 | Asteraceae | Dicot |
| cup plant | Silphium perfoliatum var. perfoliatum | SIPEP | Asteraceae | Dicot |
| cupscale grass | Sacciolepis | SACCI | Poaceae | Monocot |
| curly dock | Rumex crispus | RUCR | Polygonaceae | Dicot |
| curly dock | Rumex crispus ssp. crispus | RUCRC | Polygonaceae | Dicot |
| curly plumeless thistle | Carduus crispus | CACR2 | Asteraceae | Dicot |
| curly pondweed | Potamogeton crispus | POCR3 | Potamogetonaceae | Monocot |
| curlycup gumweed | Grindelia squarrosa | GRSQ | Asteraceae | Dicot |
| curlycup gumweed | Grindelia squarrosa var. squarrosa | GRSQS2 | Asteraceae | Dicot |
| curlytop knotweed | Polygonum lapathifolium | POLA4 | Polygonaceae | Dicot |
| currant | Ribes | RIBES | Grossulariaceae | Dicot |
| cursed buttercup | Ranunculus sceleratus | RASC3 | Ranunculaceae | Dicot |
| cursed buttercup | Ranunculus sceleratus var. sceleratus | RASCS | Ranunculaceae | Dicot |
| cushion draba | Draba breweri | DRBR2 | Brassicaceae | Dicot |
| cushion draba | Draba breweri var. cana | DRBRC | Brassicaceae | Dicot |
| cutgrass | Leersia | LEERS | Poaceae | Monocot |
| cutleaf coneflower | Rudbeckia laciniata | RULA3 | Asteraceae | Dicot |
| cutleaf coneflower | Rudbeckia laciniata var. laciniata | RULAL | Asteraceae | Dicot |
| cutleaf evening primrose | Oenothera laciniata | OELA | Onagraceae | Dicot |
| cutleaf grapefern | Botrychium dissectum | BODI2 | Ophioglossaceae | Fern |
| cutleaf medick | Medicago laciniata | MELA5 | Fabaceae | Dicot |
| cutleaf toothwort | Cardamine concatenata | CACO26 | Brassicaceae | Dicot |
| Cutler"s alpine goldenrod | Solidago cutleri | SOCU2 | Asteraceae | Dicot |
| cypress panicgrass | Dichanthelium dichotomum | DIDI6 | Poaceae | Monocot |
| cypress panicgrass | Dichanthelium dichotomum var. dichotomum | DIDID | Poaceae | Monocot |
| cypress spurge | Euphorbia cyparissias | EUCY2 | Euphorbiaceae | Dicot |
| cypress-like sedge | Carex pseudocyperus | CAPS | Cyperaceae | Monocot |