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| scientific name | common name(s) | image gallery |
| Acorus americanus | Sweetflag | |
| Acorus calamus | Calamus Single-vein sweetflag Sweet flag | |
| Acourtia nana | Dwarf desertpeony | |
| Acourtia runcinata | Featherleaf desertpeony Peonia | |
| Acourtia thurberi | Thurber's desertpeony | |
| Acourtia wrightii | Brownfoot Pink perezia | |
| Actaea elata | Tall bugbane | |
| Actaea pachypoda | White baneberry Dolls eyes | |
| Actaea racemosa var. racemosa | Black cohosh Black bugbane Bugbane Black snakeroot Fairy candles | |
| Actaea rubra | Red baneberry | |
| Actaea rubra ssp. arguta | Red baneberry | |
| Actaea rubra ssp. rubra | Red baneberry | |
| Adelia vaseyi | Vasey's Wild-lime | |
| Adenocaulon bicolor | American trailplant Pathfinder | |
| Adenostoma fasciculatum | Chamise Common chamise Greasewood | |
| Adenostoma sparsifolium | Redshank Ribbon bush Ribbonwood | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Adiantum pedatum | Northern maidenhair Maidenhair Fern | |
| Adlumia fungosa | Climbing Fumatory Allegheny Vine Mountain-fringe | |
| Adolphia infesta | Junco | |
| Aesculus californica | California buckeye | |
| Aesculus flava | Sweet buckeye Yellow buckeye | |
| Aesculus glabra | Ohio buckeye Texas buckeye Fetid buckeye Horse chestnut | |
| Aesculus glabra var. arguta | Ohio buckeye White buckeye Texas buckeye | |
| Aesculus parviflora | Bottlebrush buckeye | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Aesculus pavia var. flavescens | Texas yellow buckeye Yellow woolly buckeye Pale buckeye Plateau yellow buckeye | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Aesculus sylvatica | Painted buckeye | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Agalinis fasciculata | Beach false foxglove | |
| Agalinis gattingeri | Roundstem false foxglove | |
| Agalinis heterophylla | Prairie false foxglove Prairie agalinis Prairie false-foxglove | |
| Agalinis linifolia | Flaxleaf false foxglove | |
| Agalinis maritima | Saltmarsh false foxglove | |
| Agalinis maritima var. maritima | Saltmarsh false foxglove | |
| Agalinis neoscotica | Middleton false foxglove | |
| Agalinis oligophylla | Ridgestem false foxglove | |
| Agalinis paupercula | Smallflower false foxglove | |
| Agalinis paupercula var. borealis | Smallflower false foxglove | |
| Agalinis paupercula var. paupercula | Smallflower false foxglove | |
| Agalinis purpurea | Purple false foxglove Purple gerardia Gerardia | |
| Agalinis setacea | Threadleaf false foxglove | |
| Agalinis skinneriana | Skinner's false foxglove | |
| Agalinis tenuifolia | Slenderleaf false foxglove | |
| Agalinis tenuifolia var. tenuifolia | Slenderleaf false foxglove | |
| Agarista populifolia | Florida hobblebush Tall fetterbush Florida leucothoe Agarista | |
| Agastache foeniculum | Blue giant hyssop Blue giant-hyssop Fragrant giant hyssop Lavender hyssop Anise hyssop | |
| Agastache micrantha | White giant hyssop | |
| Agastache nepetoides | Yellow giant hyssop | |
| Agastache scrophulariifolia | Purple giant hyssop Purple giant-hyssop | |
| Agastache urticifolia | Nettleleaf giant hyssop Nettle-leaf Horsemint | |
| Agave americana | American century plant Century plant | |
| Agave deserti | Desert agave Desert century plant Century plant | |
| Agave glomeruliflora | Chisos Agave Chisos Mountains Century Plant | |
| Agave gracilipes | Slimfoot century plant | |
| Agave havardiana | Havard's century plant Havard agave | |
| Agave lechuguilla | Lechuguilla | |
| Agave palmeri | Palmer's century plant Palmer agave Blue century plant | |
| Agave parryi | Parry's agave Century plant Parry agave | |
| Agave parryi ssp. neomexicana | Parry's agave New Mexico agave | |
| Agave parryi ssp. parryi | Century plant Mescal Parry's agave Rough agave | |
| Agave shawii | Coastal agave Boundary century plant Shaw's century plant | |
| Agave univittata | Maguey mezortillo Thorncrest century plant | |
| Agave utahensis | Utah agave | |
| Agave utahensis var. nevadensis | Nevada agave | |
| Ageratina altissima | White snakeroot | |
| Ageratina altissima var. altissima | White snakeroot | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Ageratina jucunda | Hammock snakeroot | |
| Ageratina occidentalis | Western snakeroot Western thoroughwort | |
| Ageratina wrightii | White mistflower Wright's snakeroot White boneset White ageratum | |
| Agoseris aurantiaca | Orange agoseris | |
| Agoseris glauca | Pale agoseris Pale mountain dandelion False dandelion | |
| Agoseris heterophylla | Annual agoseris | |
| Agrimonia gryposepala | Tall hairy agrimony Agrimony | |
| Agrimonia parviflora | Harvest lice Small-flowered Agrimony Southern Agrimony Swamp Agrimony | |
| Agrimonia pubescens | Downy Agrimony Soft Agrimony Hairy Agrimony | |
| Agrimonia striata | Roadside agrimony | |
| Agrostis exarata | Spike bentgrass Spiked bent Spike red top | |
| Agrostis hyemalis | Winter bentgrass | |
| Agrostis mertensii | Northern bentgrass | |
| Agrostis perennans | Autumn bentgrass Upland bentgrass | |
| Agrostis scabra | Fly-away grass Rough bent Rough bentgrass Ticklegrass | |
| Aletris aurea | Golden colicroot Colicroot Star grass Yellow colic root | |
| Aletris farinosa | White colicroot Colic root Unicorn root | |
| Aletris lutea | Yellow colicroot Yellow Colic-root | |
| Aletris obovata | Southern colicroot Blunt-leaved colic root | |
| Aliciella subnuda | Coral gilia | |
| Alisma subcordatum | American water plantain | |
| Alisma triviale | Northern water plantain | |
| Allenrolfea occidentalis | Iodinebush Pickleweed | |
| Allionia choisyi | Annual windmills | |
| Allionia incarnata | Trailing windmills Trailing four o'clock Pink windmills Trailing allionia | |
| Allium acuminatum | Tapertip onion | |
| Allium amplectens | Narrowleaf onion | |
| Allium brevistylum | Shortstyle onion | |
| Allium burdickii | Narrowleaf wild leek | |
| Allium campanulatum | Dusky onion | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| scientific name | common name(s) | image gallery |