Complete list of species
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| scientific name | common name(s) | image gallery |
| Acmella oppositifolia | Oppositeleaf Spotflower | |
| Acmella oppositifolia var. repens | Oppositeleaf Spotflower Opposite-leaf Spotflower | |
| Acmispon prostratus | Wire Bird's-foot Trefoil | |
| Acoelorraphe wrightii | Everglades Palm | |
| Aconitum columbianum | Columbian Monkshood | |
| Aconitum columbianum ssp. columbianum | Columbian Monkshood | |
| Aconitum columbianum ssp. viviparum | Columbian Monkshood | |
| Aconitum delphiniifolium | Larkspurleaf Monkshood Larkspur-leaf Monkshood Northern Monkshood | |
| Aconitum delphiniifolium ssp. chamissonianum | Larkspurleaf Monkshood | |
| Aconitum delphiniifolium ssp. delphiniifolium | Larkspurleaf Monkshood | |
| Aconitum delphiniifolium ssp. paradoxum | Larkspurleaf Monkshood | |
| Aconitum infectum | Arizona Monkshood | |
| Aconitum maximum | Kamchatka Aconite Kamchatka Monkshood | |
| Aconitum noveboracense | Northern Blue Monkshood New York Monkshood | |
| Aconitum reclinatum | Trailing White Monkshood White Monkshood Trailing Wolfsbane | |
| Aconitum uncinatum | Southern Blue Monkshood Monkshood | |
| Aconitum uncinatum ssp. muticum | Blue Monkshood Southern Blue Monkshood Southern Monkshood Wild Monkshood | |
| Aconitum uncinatum ssp. uncinatum | Blue Monkshood Southern Blue Monkshood Southern Monkshood Wild Monkshood | |
| Acorus americanus | Sweetflag | |
| Acourtia microcephala | Sacapellote | |
| Acourtia nana | Dwarf Desertpeony | |
| Acourtia runcinata | Featherleaf Desertpeony Peonia | |
| Acourtia thurberi | Thurber's Desertpeony | |
| Acourtia wrightii | Brownfoot Pink Perezia | |
| Acrostichum aureum | Golden Leatherfern Golden Leather Fern | |
| Acrostichum danaeifolium | Giant Leather Fern Inland Leather Fern Giant Fern | |
| Actaea arizonica | Arizona Bugbane | |
| Actaea elata | Tall Bugbane | |
| Actaea laciniata | Cut-leaved Bugbane Mount Hood Bugbane Mt. Hood Bugbane | |
| Actaea pachypoda | White Baneberry Dolls Eyes | |
| Actaea podocarpa | Mountain Bugbane | |
| Actaea racemosa | Black Baneberry | |
| Actaea racemosa var. dissecta | Black Baneberry Black Cohosh Black Snakeroot | |
| Actaea racemosa var. racemosa | Black Cohosh Black Bugbane Bugbane Black Snakeroot Fairy Candles | |
| Actaea rubifolia | Appalachian Bugbane | |
| Actaea rubra | Red Baneberry | |
| Actaea rubra ssp. arguta | Red Baneberry | |
| Actaea rubra ssp. rubra | Red Baneberry | |
| Actaea ×ludovici | Baneberry Louis's Baneberry | |
| Adelia vaseyi | Vasey's Wild-lime | |
| Adelinia grandis | Pacific Hound's-tongue Adeline's Hound's-tongue Western Hound's-tongue Grand Hound's-tongue | |
| Adenocaulon bicolor | American Trailplant Pathfinder | |
| Adenophorus abietinus | Elegant Kihi Fern Elegant Kihifern | |
| Adenophorus epigaeus | Kauai Kihi Fern Kauai Kihifern | |
| Adenophorus haalilioanus | Island Kihi Fern Island Kihifern | |
| Adenophorus hymenophylloides | Filmy Kihi Fern Hawaiian Hidden Fern | |
| Adenophorus montanus | Maui Kihi Fern Maui Kihifern | |
| Adenophorus oahuensis | Oahu Kihi Fern Oahu Kihifern | |
| Adenophorus periens | Pendant Kihi Fern Pendant Kihifern | |
| Adenophorus pinnatifidus | Graceful Kihi Fern Graceful Kihifern | |
| Adenophorus tamariscinus | Lady of the Mountain Wahini Noho Mauna | |
| Adenophorus tripinnatifidus | Royal Kihi Fern Royal Kihifern | |
| Adenophorus ×abbottiae | Kihi Fern Kihifern | |
| Adenophorus ×carsonii | Kihi Fern Kihifern | |
| Adenophyllum cooperi | Cooper's Dogweed Cooper Dyssodia | |
| Adenophyllum porophylloides | San Felipe Dogweed San Felipe Dyssodia | |
| Adenophyllum porophyllum | Poreleaf Dogweed | |
| Adenophyllum wrightii | Wright's Dogweed | |
| Adenostemma lavenia | Common Medicineplant Sticky Daisy | |
| Adenostoma fasciculatum | Chamise Common Chamise Greasewood | |
| Adenostoma fasciculatum var. fasciculatum | Chamise | |
| Adenostoma fasciculatum var. obtusifolium | Chamise San Diego Chamise | |
| Adenostoma sparsifolium | Redshank Ribbon Bush Ribbonwood | |
| Adiantum aleuticum | Aleutian Maidenhair Five-finger Fern Five Finger Maidenhair Western Maidenhair | |
| Adiantum capillus-veneris | Southern Maidenhair Fern Common Maidenhair Fern Maidenhair Fern Venus Hair Fern | |
| Adiantum jordanii | California Maidenhair | |
| Adiantum melanoleucum | Fragrant Maidenhair | |
| Adiantum pedatum | Northern Maidenhair Fern Maidenhair Fern | |
| Adiantum shastense | Shasta Maidenhair | |
| Adiantum tenerum | Fan Maidenhair Fern Brittle Maidenhair Fern Black-stick Maidenhair Fern | |
| Adiantum tricholepis | Hairy Maidenhair Fern Fuzzy Maidenhair Fern | |
| Adiantum villosum | Woolly Maidenhair Fern | |
| Adiantum viridimontanum | Green Mountain Maidenhair | |
| Adiantum ×tracyi | Maidenhair Fern Tracy's Maidenhair | |
| Adlumia fungosa | Climbing Fumatory Allegheny Vine Mountain Fringe | |
| Adolphia californica | California Prickbush Spinebush | |
| Adolphia infesta | Junco | |
| Adoxa moschatellina | Muskroot Hollowroot Townhall Clock Tuberous Crowfoot | |
| Aegopogon tenellus | Fragile Grass Fragilegrass | |
| Aeschynomene americana | Shyleaf American Joint Vetch Joint Vetch Deer Vetch | |
| Aeschynomene indica | Indian Jointvetch | |
| Aeschynomene pratensis | Meadow Jointvetch | |
| Aeschynomene rudis | Zigzag Jointvetch | |
| Aeschynomene villosa | Hairy Jointvetch | |
| Aeschynomene virginica | Northern Jointvetch Virginia Jointvetch | |
| Aeschynomene viscidula | Sticky Jointvetch | |
| Aesculus californica | California Buckeye | |
| Aesculus flava | Yellow Buckeye Sweet Buckeye | |
| Aesculus glabra | Ohio Buckeye Texas Buckeye Fetid Buckeye Horse Chestnut | |
| Aesculus glabra var. arguta | Ohio Buckeye White Buckeye Texas Buckeye | |
| Aesculus glabra var. glabra | Fetid Buckeye Ohio Buckeye | |
| Aesculus parviflora | Bottlebrush Buckeye | |
| Aesculus pavia | Red Buckeye Scarlet 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 | |
| Aesculus ×bushii | Buckeye Bush's Chestnut | |
| Aesculus ×hybrida | Buckeye Hybrid Chestnut | |
| Aesculus ×marylandica | Maryland Chestnut Maryland Buckeye | |
| Aesculus ×mutabilis | Pink Buckeye | |
| scientific name | common name(s) | image gallery |
