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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 | |
| Arctostaphylos hookeri | Hooker's manzanita Monterey manzanita | |
| Artemisia ludoviciana | Louisiana artemisia Louisiana sage White sage Prairie sage Silver sage White sagebrush Louisiana wormwood Silver wormwood Louisiana sagewort Gray sagewort Cudweed sagewort Mugwort wormwood | |
| Arbutus menziesii | Pacific madrone Oregon laurel Laurelwood | |
| Artemisia palmeri | San Diego sagebrush San Diego sagewort | |
| Arctostaphylos patula | Greenleaf manzanita Green-leaf manzanita | |
| Arctostaphylos pungens | Pointleaf manzanita Mexican Manzanita | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Aristida purpurea var. nealleyi | Blue threeawn | |
| Artemisia pycnocephala | Beach sagebrush Beach wormwood Sand hill sage | |
| Artemisia tridentata | Big sagebrush Great Basin sagebrush | |
| Arctostaphylos uva-ursi | Kinnikinnick Red bearberry Kinnikinnik | |
| Asarum caudatum | British Columbia wild ginger Long-tail wild ginger | |
| Asclepias californica | California milkweed | |
| Asyneuma prenanthoides | California harebell Nodding harebell | |
| Asclepias speciosa | Showy milkweed | |
| Atriplex canescens | Chamiso Four-wing saltbush Fourwing saltbush Wingscale | |
| Atriplex lentiformis | Big saltbush Coastal quail bush Quailbush Saltbush | |
| Batis maritima | Seaside saltwort Turtleweed | |
| Baccharis pilularis | Coyotebrush Chaparral broom Coyote bush | |
| Betula occidentalis | Mountain birch Water birch | |
| Blechnum spicant | Deer fern | |
| Bothriochloa barbinodis | Cane bluestem | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua eriopoda | Black grama | |
| Bouteloua gracilis | Blue grama | |
| Boykinia occidentalis | Coast Boykinia Coastal brookfoam | |
| Boykinia rotundifolia | Roundleaf brookfoam | |
| Brodiaea californica | California brodiaea | |
| Brodiaea coronaria | Crown brodiaea Harvest brodiaea | |
| Brodiaea elegans | Harvest brodiaea Elegant cluster-lily | |
| Brodiaea minor | Vernalpool brodiaea | |
| Carex barbarae | Santa Barbara sedge | |
| Carpenteria californica | Bush anemone Tree anemone Tree-anemone | |
| Calochortus catalinae | Santa Catalina mariposa lily | |
| Calocedrus decurrens | Incense cedar Incense-cedar | |
| Calliandra eriophylla | Pink fairyduster Fairyduster Mesquitilla Mock mesquite | |
| Calochortus kennedyi | Desert mariposa lily Desert mariposa Red mariposa-lily Flame mariposa | |
| Calochortus luteus | Yellow mariposa lily | |
| Carex obnupta | Slough sedge | |
| Calycanthus occidentalis | Western sweetshrub California sweet shrub Spice bush Western spicebush | |
| Carex pansa | Sanddune sedge | |
| Carex pellita | Woolly sedge | |
| Carex spissa | San Diego sedge | |
| Calochortus venustus | Butterfly mariposa lily Butterfly mariposa-lily White mariposa-lily | |
| Calochortus vestae | Coast range mariposa lily | |
| Ceanothus arboreus | Feltleaf Feltleaf ceanothus Island ceanothus Island mountain lilac | |
| Ceanothus griseus | Carmel ceanothus Carmel creeper Yankee Point ceanothus | |
| Ceanothus greggii var. vestitus | Mojave ceanothus Desert ceanothus | |
| Ceanothus hearstiorum | Hearst Ranch buckbrush | |
| Ceanothus impressus | Santa Barbara ceanothus Santa Barbara buckbrush | |
| scientific name | common name(s) | image gallery |