Baccharis 'Centennial' Centennial Desert Broom (Horticultural)
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 'Pozo Surf' Lowly Coyote Bush (Horticultural)
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 (Mahonia) aquifolium var. repens Creeping Mahonia
Berberis (Mahonia) aquifolium 'Compacta' Creeping Mahonia 'Compacta' (San Jacinto, Sierras, North Coast Ranges).
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)
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 'Southcoast Blue' Southcoast Blue Ceanothus (Hybrid)
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 (Horticultural)
Chilopsis linearis 'Maggie's Pink' Maggie's Pink Desert Willow (Horticultural)
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)
Clinopodium chandleri San Diego Savory (Southern, Baja)
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 (Lessingia) filaginafolia California Aster (Statewide, Baja)
Corethrogyne filaginafolia var. linifoia Sand Aster (Southern, Central)
Corethrogyne filaginifolia var. californica ‘Silver Carpet' Sand Aster 'Silver Carpet' (Central Western and North Coastal California to Southwest Oregon)
Cornus californica California Dogwood (Statewide but uncommon in California)
Cornus occidentalis Western Dogwood (Statewide)
Cornus sericea (C. stolonifera) American or Redstem Dogwood (Statewide but uncommon in California)
Crocanthemum (Helianthemum) scoparium Rock-rose, Peak Rush-rose (Coastal)
Crossosoma californicum Ragged Rock Flower (Palos Verdes Peninsula, San Clemente Island, Santa Catalina Islands and Guadalupe Island)
Croton californicus California Croton (Statewide, Baja)
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)