Baccharis emoryi   Emory's Baccharis   (Southern, Central)

Baccharis 'Pigeon Point'   Pigeon Point Dwarf Coyote Bush    (Horticultural, San Mateo)

Baccharis pilularis   Coyote Bush   (Statewide)

Baccharis pilularis 'Twin Peaks'   Twin Peaks Dwarf Coyote Bush   (Horticultural, San Francisco)

Baccharis salicifolia   Mule-Fat   (Southern, Central)

Baccharis sarothroides   Broom Baccharis   (Southern)

Baileya multiradiata   Desert Marigold   (Southern) 

Bahiopsis laciniata   San Diego Sunflower   (Southern) 

Bebbia juncea   Rush Sweetbush   (Baja California, Southern) 

Berberis aquifolium var. repens   Creeping Mahonia

Berberis ‘Golden Abundance’   Golden Abundance Oregon Grape   (Hybrid)

Berberis nevinii   Nevin's Barberry

Bergerocactus emoryi   Velvet Cactus   (Southern, Baja California)

Bothriochloa barbinodis   Cane Bluestem   (Southern)

Bouteloua gracilis   Blue Grama Grass   (Statewide)

Brahea armata   Mexican Blue Fan Palm   (Baja California)

Brickellia californica   California Brickellbush   (Statewide)

Brodiaea species 

Bromus carinatus   California Brome

Calliandra californica   Baja Fairy Duster   (Baja California, Arizona)

Calliandra eriophylla   Pink Fairy Duster   (Southern)

Calliandra penisularis   Red Fairy Duster   (Baja California) 

Calliandra 'Sierra Star'   Sierra Star Fairy Duster   (Horticultural)

Calocedrus decurrens   Incense Cedar   (Statewide)

Calochortus dunnii   Dunn's Mariposa Lily   (Baja California, Southern)

Calycanthus occidentalis   Spice Bush   (Northern, Central)

Calystegia macrostegia   California Morning Glory   (Southern)

Calystegia macrostegia ssp. macrostegia 'Anacapa Pink'   Anacapa Pink Island Morning-Glory   (Horticultural, Anacapa Is.)

Camissonia cheiranthifolia   Beach Evening Primrose   (Statewide)

Carex barbarae   Santa Barbara Sedge   (Statewide)

Carex pansa   California Meadow Sedge   (Central, Northern)

Carex praegracilis   Clustered Field Sedge   (Statewide)

Carex spissa   San Diego Sedge   (Southern)

Carpenteria californica   Bush Anemone   (Central)

Castillegia exersta   Purple Owl's Clover   (Southern)   

Ceanothus 'Anchor Bay'   Anchor Bay Ceanothus   (Horticultural, Mendocino)

Ceanothus arboreus   Island Ceanothus   (Southern)

Ceanothus 'Blue Jeans'   Blue Jeans Ceanothus   (Hybrid)

Ceanothus 'Concha'   Concha Ceanothus   (Hybrid)  

Ceanothus crassifolius   Hoaryleaf Ceanothus   (Baja California, Statewide) 

Ceanothus cyaneus   Lakeside Ceanothus   (Southern)

Ceanothus 'Dark Star'   Dark Star Ceanothus   (Hybrid)

Ceanothus 'Frosty Blue'   Frosty Blue Ceanothus   (Hybrid)  

Ceanothus griseus var. horizontalis 'Yankee Point'   Yankee Point Ceanothus   (Horticultural, Monterey)

Ceanothus hearstorium   Hearst's Ceanothus   (Central)

Ceanothus 'Heart's Desire'   Heart's Desire Ceanothus   (Horticultural, C. foliosus x gloriosus)

Ceanothus 'Joyce Coulter'   Joyce Coulter Ceanothus   (Hybrid, random)

Ceanothus 'Julia Phelps'   Julia Phelps Ceanothus   (Hybrid, random)

Ceanothus 'Louis Edmunds'   Louis Edmunds Ceanothus   (Horticultural)

Ceanothus maritimus   Maritime Ceanothus   (Central)

Ceanothus megacarpus   Big Pod Ceanothus   (Southern)

Ceanothus oliganthus   Hairy Ceanothus  

Ceanothus otayensis   Otay Lilac

Ceanothus 'Ray Hartman'   Ray Hartman Ceanothus   (Horticultural, San Mateo)

Ceanothus 'Sierra Blue'   Sierra Blue Ceanothus   (Hybrid)

Ceanothus 'Snowflurry'  Snowflurry Ceanothus   (Horticultural, Monterey Co.)

Ceanothus spinosus   Greenbark Ceanothus   (Southern, Central)

Ceanothus tomentosus var. olivaceus   Woolyleaf Ceanothus   (Southern)

Ceanothus verrucosus   Wartystem Ceanothus   (Southern)

Cercidium floridum   Blue Palo Verde   (Southern)

Cercis occidentalis   Western Redbud   (Statewide)

Cercocarpus alnifolius   Island Mountain Mahogany

Cercocarpus betuloides   Western Mountain Mahogany   (Statewide)

Cercocarpus minutiflorus   San Diego Mountain Mahogany   (Southern)

Chilopsis linearis   Desert Willow   (Southern)

Chilopsis linearis 'Burgundy'   Burgundy Desert Willow   (Cultivar)

Chrysopsis villosa 'San Bruno Mountain'   San Bruno Mountain Golden Aster   (Horticultural)

Chrysothamnus nauseosus   Rabbitbrush   (Baja California, Statewide)

Clarkia amoena   Farewell to Spring   (Northern) *

Clarkia purpurea   Winecup   (Baja California, Statewide) *

Clarkia unguiculata   Elegant Clarkia   (Statewide) *

Clematis lasiantha   Pipestem Clematis   (Statewide)

Clematis ligusticifolia   Virgin's Bower   (Statewide)

Clematis pauciflora   Small-flowered Clematis   (Southern)

Cneoridium dumosum   Bushrue   (Southern)

Comarostaphylis diversifolia ssp. diversifolia   Summer Holly   (Southern)

Constancea nevinii   Nevin's Woolly Sunflower   (Santa Catalina and San Clemente Islands)

Coreopsis gigantea   Giant Sea-Dahlia  (Central, Channel Islands)

Coreopsis maritima   San Diego Sea-Dahlia   (Southern, Coastal)

Corethrogyne filaginafolia   Del Mar Sand Aster   (Southern, Central)

Cornus californica   California Dogwood (Statewide but uncommon in California)

Cornus occidentalis   Western Dogwood (Statewide)

Cornus stolonifera (C. sericea)   Redstem Dogwood   (Statewide but uncommon in California)

Crossosoma californicum   Ragged Rock Flower   (Palos Verdes Peninsula, San Clemente Island, Santa Catalina Islands and Guadalupe Island)

Cupressus arizonica   Arizona Cypress   (Southwestern US, not California)

Cupressus forbesii   Tecate Cypress   (Southern)

Cupressus goveniana   Gowen Cypress   (Monterey Peninsula)

Cylindropuntia californica var. californica (Opuntia parryi)   Snake Cholla   (Southern, Baja California)

Cylindropuntia prolifera   Coast Cholla Cactus   (Southern, Channel Islands, Baja California)