Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 Maidenhair Five-finger Fern 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 | |
| Aesculus ×neglecta | Buckeye Chestnut | |
| Agalinis acuta | Sandplain False Foxglove Sandplain Gerardia | |
| scientific name | common name(s) | image gallery |
