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| scientific name | common name(s) | image gallery |
| Abies bracteata | Bristlecone fir | |
| Abies concolor | Balsam fir Colorado fir Concolor fir Oyamel de California Silver fir White balsam White fir | |
| Abies grandis | Giant fir Grand fir | |
| Acalypha californica | California copperleaf | |
| Acer circinatum | Oregon vine maple Vine maple | |
| Achnatherum coronatum | Giant rice grass Giant ricegrass Needle-and-thread grass | |
| Aconitum columbianum | Columbian monkshood | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acacia greggii | Catclaw acacia Gregg acacia Long-flower catclaw Una de gato | |
| Achnatherum hymenoides | Indian ricegrass Indian Millet Sandgrass | |
| Achnatherum lettermanii | Letterman's needlegrass | |
| Acer macrophyllum | Bigleaf maple Big-leaf maple | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Actaea rubra | Red baneberry | |
| Achnatherum speciosum | Desert needlegrass Desert rice grass Spear grass | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Adenostoma fasciculatum | Chamise Common chamise Greasewood | |
| Adenostoma sparsifolium | Redshank Ribbon bush Ribbonwood | |
| Aesculus californica | California buckeye | |
| Agave deserti | Desert agave Desert century plant Century plant | |
| Agrimonia gryposepala | Tall hairy agrimony Agrimony | |
| Agave shawii | Coastal agave Boundary century plant Shaw's century plant | |
| Agastache urticifolia | Nettleleaf giant hyssop Nettle-leaf Horsemint | |
| Agave utahensis | Utah agave | |
| Allium amplectens | Narrowleaf onion | |
| Allium dichlamydeum | Coastal onion | |
| Allium peninsulare | Mexicali onion | |
| Allium praecox | Early onion | |
| Alnus rhombifolia | White alder | |
| Allium unifolium | Oneleaf onion | |
| Allium validum | Pacific onion Swamp onion Tall swamp onion | |
| Aloysia wrightii | Wright's beebrush Wright’s lippia | |
| Ambrosia dumosa | Burrobush White bursage White bur sage | |
| Amelanchier utahensis | Utah service-berry Utah serviceberry | |
| Anemopsis californica | Yerba mansa Yerba-mansa Lizard tail | |
| Apocynum cannabinum | Indian hemp Prairie dogbane Dogbane Hemp dogbane | |
| Aquilegia eximia | Van Houtte's columbine Serpentine columbine | |
| Aquilegia formosa | Western columbine Crimson columbine Scarlet columbine Red columbine | |
| Aquilegia pubescens | Sierra columbine Sierran columbine | |
| Aristolochia californica | California dutchman's pipe | |
| Artemisia californica | Coastal sagebrush California sagebrush | |
| Aralia californica | California spikenard | |
| Arctostaphylos canescens | Hoary manzanita | |
| Arctostaphylos columbiana | Hairy manzanita | |
| Arctostaphylos densiflora | Vine Hill manzanita | |
| Artemisia douglasiana | Douglas mugwort Douglas' sagewort | |
| Arctostaphylos edmundsii | Little Sur manzanita | |
| Argentina egedii ssp. egedii | Pacific silverweed Beach Silverweed | |
| Arctostaphylos glandulosa | Eastwood's manzanita | |
| Arctostaphylos glauca | Bigberry manzanita Blue manzanita | |
| scientific name | common name(s) | image gallery |