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 Eastwood Manzanita (Baja California, Southern)
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 'Ophio-viridis' Greensnake Manzanita (Horticultural)
Arctostaphylos otayensis Otay Manzanita (Southern)
Arctostaphylos 'Pacific Mist' Pacific Mist Manzanita (Hybrid)
Arctostaphylos pajaroensis ‘Brother James’ Pajaro Manzanita ‘Brother James’ (Horticultural)
Arctostaphylos pajaroensis ‘Paradise’ Pajaro Manzanita ‘Paradise’ (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)
Argemone munita Prickly Poppy or Chicalote (Statewide, Baja)
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 dracunculus Wild Tarragon (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)
Atriplex leucophylla Beach Saltbush (Baja California, Statewide)