Delphinium cardinale   Cardinal Larkspur   (Southern, Baja California)

Delphinium parryi   Blue Larkspur   (Southern, Central, Baja California)

Dendromecon harfordii   Channel Island Bush Poppy   (Southern)

Dendromecon rigida   Bush Poppy   (Statewide)

Deschampsia caespitosa   Tufted Hairgrass   (Statewide)

Dichelostemma capitatum   Blue Dicks   (Statewide)

Dichondra occidentalis   Western Dichondra   (Southern, Baja California)

Distichlis spicata   Saltgrass   (Statewide)

Dodecatheon clevelandii   Padre's Shooting Star    (Statewide)

Drymocallis glandulosa (Potentilla glandulosa)   Sticky Cinquefoil   (Statewide)

Dudleya abramsii   Abrams's Dudleya   (Southern, Baja California)

Dudleya attenuata   Tapertip Live-Forever   (Southern, Baja California)

Dudleya brittonii   Britton's Chalk Dudleya   (Baja California)  

Dudleya candelabra   Candleholder Dudleya   (Santa Cruz & Santa Rosa Islands)

Dudleya cymosa   Canyon Dudleya   (Statewide)

Dudleya edulis   Ladies' Fingers   (Southern, Baja California)  

Dudleya farinosa   Bluff Lettuce   (Central, Northern)

Dudleya hassei   Catalina Island Live-Forever   (Southern, Island)

Dudleya ingens   Dudleya Live-Forever   (Southern, Baja California)  

Dudleya lanceolata   Lance-Leaf Dudleya   (Southern)

Dudleya palmeri   Palmer's Dudleya   (Statewide)

Dudleya pulverulenta   Chalk Dudleya   (Southern, Central)

Dudleya saxosa ssp. aloides   Panamint Dudleya   (Southern, Baja California)

Dudleya traskiae   Santa Barbara Island Dudleya   (Santa Barbara Island)

Dudleya viscida   Sticky Dudleya   (Southern)

Eleocharis montevidensis   Dombey's Spike-Rush   (Statewide)

Eleocharis parishii   Parish's Spike-Rush   (Central, Northern)

Elymus condensatus   Giant Wild Rye   (Southern, Central, Baja California)

Elymus condensatus 'Canyon Prince'   Canyon Prince Wild Rye   (Southern, Central, Baja California) 

Elymus glaucus   Blue Wild Rye   (Statewide)

Elymus triticoides   Beardless Wild Ryegrass    (Statewide)

Encelia californica   Coast Sunflower   (Southern)  

Encelia farinosa   Incienso   (Southern)

Ephedra californica   Mormon Tea   (San Diego)

Epilobium canum   California Fuschia   (Southern, Central)  

Epilobium ‘Catalina’   Catalina Fuschia   (Horticultural, Catalina Is)

Epilobium ‘Everett's Choice’   Everett's Choice Fuschia   (Horticultural)

Epilobium 'Route 66'   Route 66 Fuschia   (Horticultural)

Epipactis gigantea   Stream Orchid   (Statewide)

Equisetum arvense   Common Horsetail

Ericameria cuneata   Compact Goldenbush   (Statewide)

Ericameria nauseosus   Rubber Rabbitbush   (Statewide, Baja California)

Ericameria palmeri   Palmer's Goldenbush   (Southern, Baja California)

Erigeron foliosus   Leafy Fleabane   (Statewide, Baja California)

Erigeron glaucus   Beach Aster   (Horticultural)

Erigeron glaucus 'Arthur Menzies'   Arthur Menzies Compact Beach Aster   (Horticultural, Golden State Park)

Erigeron glaucus 'Wayne Roderick'   Wayne Roderick Compact Beach Aster   (Statewide)

Eriodictyon crassifolium   Thickleaf Yerba Santa   (Southern)

Eriogonum arborescens   Santa Cruz Island Buckwheat   (Southern)

Eriogonum 'Bruce Dickenson'   Bruce Dickenson Buckwheat

Eriogonum cinereum   Ashy Leaf Buckwheat   (Southern)

Eriogonum crocatum   Conejo Buckwheat   (Southern)

Eriogonum fasciculatum   California Buckwheat   (Southern, Central)  

Eriogonum fasciculatum 'Dana Point'   Dana Point Buckwheat   (Horticultural, Dana Pt.)

Eriogonum giganteum   St. Catherine's Lace   (Southern)

Eriogonum grande var. rubescens   Red Buckwheat   (Southern, Islands)  

Eriogonum parvifolium   Coastal Buckwheat   (Southern, Central)   

Eriophyllum confertiflorum   Golden-Yarrow   (Statewide)

Eriophyllum nevinii  (now Constancea nevinii)   Catalina Silverlace   (Santa Catalina & San Clemente Islands)

Erysimum capitatum   Western Wallflower   (Statewide)

Erysimum concinnum   Coast Wallflower

Eschscholzia californica   California Poppy   (Statewide, Baja California) 

Euphorbia misera   Cliff Spurge   (Southern, Baja California)

Fallugia paradoxa   Apache Plume   (Southern)

Ferocactus cylindraceus   California Barrel Cactus   (Southern, Baja California)

Ferocactus viridescens   Coast Barrel Cactus   (Southern)

Festuca californica   California Fescue   (Northern, Central)

Festuca rubra 'Molate'   Molate Red Fescue   (Horticultural)

Fouquiera splendens   Ocotillo   (Southern)

Fragaria vesca   California Strawberry   (Statewide)

Frangula californica ssp. californica (Rhamnus californica)   California Coffeeberry   (Statewide, Baja California) 

Frankenia salina   Alkali Heath   (Central, Northern)

Fraxinus trifoliata   California Ash   (Southern San Diego County, Baja California) 

Fraxinus velutina   Velvet Ash

Fremontodendron californicum   California Flannelbush, Fremontia   (Statewide)

Fremontodendron 'California Glory'   California Glory Flannelbush   (Hybrid)

Fremontodendron 'El Dorado Gold'   El Dorado Gold Flannelbush   (Horticultural)

Fremontodendron mexicanum   Mexican Flannelbush   (Southern)

Fremontodendron 'West Hills'   West Hills Flannelbush   (Hybrid)

Funastrum cynanchoides   Climbing Milkweed