Abies concolor  White Fir (Statewide)

Abronia umbellata   Sand Verbena   (Statewide)

Abronia villosa   Desert Sand Verbena   (Southern)

Abutilon palmeri   Indian Mallow   (Southern)  

Acacia greggii   Catclaw   (Southern)

Acer macrophyllum   Big-Leaf Maple   (Statewide)

Acer negundo   California Box-Elder   (Statewide)

Achillea millefolium   Yarrow   (North America)  *

Achnatherum coronatum   Giant Stipa   (Southern, Central, Baja California)

Acmispon glaber   Deerweed   (Statewide)

Adenostoma fasciculatum   Chamise   (Statewide)

Adenostoma fasciculatum 'Black Diamond'   Black Diamond Prostrate Chamise   (Horticultural)

Adenostoma fasciculatum 'Nicolas'   Nicolas Prostrate Chamise   (Horticultural, San Nicolas Island)

Adenostoma sparsifolium   Redshanks   (Southern)

Adiantum (cupillus-veneis or jordanii)   Maiden-hair Fern

Adolphia californica   Spineshrub   (Southern)

Aesculus californica   California Buckeye   (North to Central)

Agave deserti   Desert Agave   (Southern)

Agave shawii   Shaw's Agave   (Baja California, Pt. Loma)

Agrostis pallens   San Diego Bent Grass   (Southern)

Allium haematochiton   Red-skin Onion   (Baja California, Southern, Central)

Allium praecox   (Early Onion)   (Baja California, Southern)  

Alnus rhombifolia   White Alder   (Statewide)

Ambrosia chamissonis   Beach Bur

Ambrosia chenopodiifolia   San Diego Bur-sage   (Statewide)

Ambrosia pumila   San Diego Ragweed   (Southern)

Amorpha fruticosa   False Indigo   (Southern)

Anemopsis californica   Yerba Mansa   (Statewide)

Antigonum leptopus   San Miguel Coral Vine   (Baja California)

Aquilegia formosa   California Columbine   (Statewide)

Arbutus menziesii   Madrone   (Northern, Central)

Arctostaphylos 'Austin Griffith'   Austin Griffith Manzanita   (Horticultural)

Arctostaphylos 'Baby Bear'   Baby Bear Manzanita   (Horticultural)

Arctostaphylos bakeri 'Louis Edmunds'   Louis Edmunds Manzanita   (Horticultural)

Arctostaphylos catalinae   Catalina Manzanita   (Channel Islands)

Arctostaphylos cruzensis   La Cruz Manzanita   (Central)

Arctostaphylos densiflora '‘Howard McMinn'’   Howard McMinn Manzanita   (Horticultural, North Coast)

Arctostaphylos edmundsii 'Carmel Sur'   Carmel Sur Manzanita   (Horticultural, Monterey)

Arctostaphylos 'Ian Bush'   Ian Bush Manzanita   (Horticultural)

Arctostaphylos densiflora 'Sentinel'   Sentinel Manzanita   (Horticultural)

Arctostaphylos 'Dr. Hurd'   Dr. Hurd's Manzanita   (Horticultural)

Arctostaphylos 'Emerald Carpet'   Emerald Carpet Manzanita   (Mendocino Hybrid)

Arctostaphylos franciscana   Franciscsan Manzanita   (San Francisco)

Arctostaphylos glandulosa ssp. adamsii   Laguna Manzanita   (Baja California, Southern)

Arctostaphylos glandulosa var. crassifolia   Del Mar Manzanita   (Southern)

Arctostaphylos glauca   Big-Berry Manzanita   (Statewide)

Arctostaphylos 'Greensphere'   Greensphere Manzanita   (Hybrid)

Arctostaphylos 'Harmony'   Harmony Manzanita   (Horticultural, Sonoma)

Arctostaphylos hookeri 'Monterey Carpet'   Monterey Carpet Manzanita   (Horticultural, Monterey)

Arctostaphylos insularis ‘'Canyon Sparkles'’   Canyon Sparkles Manzanita   (Horticultural)

Arctostaphylos 'John Dourley'   John Dourley Manzanita   (Hybrid)

Arctostaphylos 'Lester Rowntree'   Lester Rowntree Manzanita   (Hybrid)

Arctostaphylos otayensis   Otay Manzanita   (Southern)

Arctostaphylos 'Pacific Mist'   Pacific Mist Manzanita   (Hybrid)

Arctostaphylos pajaroensis   Pajaro Manzanita   (Horticultural)

Arctostaphylos patula   Green Leaf Manzanita   (Baja California, Statewide)

Arctostaphylos pungens   Mexican Manzanita   (Southern)

Arctostaphylos refugioensis   Refugio Manzanita   (Southern)

Arctostaphylos silvicola   Ghostly Manzanita   (Central)

Arctostaphylos 'Sunset'   Sunset Manzanita   (Hybrid, Monterey)

Arctostaphylos uva-ursi 'Anchor Bay'   Anchor Bay Manzanita   (Horticultural)

Arctostaphylos uva-ursi ‘'Pt. Reyes'’   Pt. Reyes Manzanita   (Horticultural, North Coast)

Arctostahylos viridissima   McMinn's Manzanita   (Santa Cruz Island)

Arctostahpylos 'Wood's Compact'   Wood's Compact Manzanita   (Horticultural)

Aristida purpurea   Purple Three-Awn   (Southern, Central)

Armeria maritima   Thrift, Sea Pink   (Central, Channel Islands, Northern)

Artemisia californica   Coastal Sagebrush  

Artemisia californica 'Canyon Gray'   Canyon Gray Sagebrush   (Horticultural)

Artemisia californica 'Montara'   Montara Sagebrush   (Horticultural)

Artemisia douglasiana   Douglas Mugwort   (Statewide)

Artemisia ludoviciana   Silver Wormwood   (Statewide)

Artemisia nesiotica   Channel Island Sagebrush   (Southern)

Artemisia palmeri   San Diego Sagewort   (Southern)

Artemisia pycnocephala 'David's Choice'   David's Choice Sagewort

Artemisia tridentata   Big Sagebrush   (Statewide)

Asclepias californica   California Milkweed

Asclepias eriocarpa   Indian Milkweed

Asclepias fascicularis   Narrow-Leaf Milkweed   (Statewide)  

Asclepias speciosa   Showy Milkweed   (Statewide)

Aster ascendens   San Gabriel Aster

Aster chilensis   California Aster   (Statewide)

Astragalus nuttallii   Nuttall's Milkvetch   (Baja California, Statewide)

Atriplex canescens   Fourwing Saltbush   (Southern)

Atriplex lentiformis ssp. breweri   Coastal Quail Bush   (Southern)