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| scientific name | common name(s) | image gallery |
| Celtis laevigata var. reticulata | Netleaf hackberry Netleaf sugar hackberry Sugar Hackberry Texas Sugarberry Palo Blanco Acibuche | |
| Ceanothus leucodermis | Chaparral whitethorn Jackbrush | |
| Cercocarpus montanus var. glaber | Birch-leaf mountain-mahogany Birchleaf mountain mahogany Hard tack | |
| Cercocarpus montanus var. minutiflorus | Smooth mountain mahogany San Diego mountain-mahogany | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Ceanothus spinosus | Redheart Greenbark ceanothus Red-heart mountain lilac | |
| Ceanothus thyrsiflorus | Blue blossom Blueblossom Bluebrush | |
| Ceanothus tomentosus | Woolyleaf ceanothus Woolly-leaf mountain lilac Ramona lilac | |
| Chamaecyparis lawsoniana | Port Orford cedar Port Orford-cedar Lawson falsecypress | |
| Chamaebatiaria millefolium | Desert sweet Fernbush Tansy bush | |
| Chlorogalum pomeridianum | Wavyleaf soap plant Wavyleaf Soap-plant | |
| Clinopodium douglasii | Oregon-tea Yerba buena | |
| Cleome isomeris | Bladderpod spiderflower Bladderpod | |
| Clematis lasiantha | Pipestem clematis Pipestems Chaparral clematis | |
| Cneoridium dumosum | Bush rue Bush-rue | |
| Corylus cornuta var. californica | California hazelnut | |
| Comarostaphylis diversifolia | Summer holly | |
| Comarostaphylis diversifolia ssp. planifolia | Channel Island summer holly Summer holly | |
| Coreopsis gigantea | Giant coreopsis Giant tickseed Tree coreopsis | |
| Cornus glabrata | Brown dogwood Smooth-leaf dogwood | |
| Constancea nevinii | Nevin's woolly sunflower Catalina silverlace | |
| Cornus sericea ssp. sericea | Redosier dogwood Red Osier Dogwood | |
| Crataegus douglasii | Black hawthorn | |
| Cupressus bakeri | Modoc cypress Baker Cypress | |
| Cupressus forbesii | Tecate cypress | |
| Cupressus macnabiana | MacNab's cypress | |
| Cupressus macrocarpa | Monterey cypress | |
| Cupressus sargentii | Sargent's cypress Sargent Cypress | |
| Cylindropuntia bigelovii | Teddybear cholla | |
| Cypripedium californicum | California lady's slipper | |
| Cypripedium montanum | Mountain lady's slipper | |
| Danthonia californica | California oatgrass California wild oat grass | |
| Darlingtonia californica | California pitcherplant Cobra Plant | |
| Darmera peltata | Indian rhubarb Indian-rhubarb Umbrella plant | |
| Dendromecon harfordii | Harford's tree poppy Channel Island tree poppy | |
| Diplacus aurantiacus ssp. aurantiacus | Orange bush monkeyflower | |
| Dichelostemma capitatum | Bluedicks | |
| Dichelostemma congestum | Ookow | |
| Dicentra formosa | Pacific bleeding heart Pacific bleedinghearts Western bleedingheart | |
| Diplacus grandiflorus | Azalea-flowered diplacus Large-flower bush-monkey-flower Largeflower bush monkeyflower | |
| Dichelostemma ida-maia | Firecracker flower | |
| Diplacus longiflorus | Southern bush monkeyflower | |
| Diplacus parviflorus | Island bush monkeyflower | |
| Diplacus puniceus | Red bush monkeyflower Mission diplacus | |
| Drosera anglica | English sundew Narrowleaf sundew | |
| Dryopteris arguta | Coastal wood fern Coastal woodfern | |
| Drosera rotundifolia | Roundleaf sundew | |
| Dudleya farinosa | Bluff lettuce Powdery live-forever Powdery liveforever | |
| Dudleya lanceolata | Lanceleaf liveforever | |
| Dudleya virens ssp. hassei | Bright green dudleya Santa Catalina dudleya | |
| scientific name | common name(s) | image gallery |