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)
Diplacus aridus Low Bush Monkeyflower (Southern, Baja California)
Diplacus aurantiacus (Mimulus aurantiacus) Bush Monkeyflower (Statewide)
Diplacus longiflorus (Mimulus longiflorus, Mimulus aurantiacus var. longiflorus) Southern Bush Monkeyflower (Southern, Central)
Diplacus puniceus Red Bush Monkeyflower (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 attenuata ssp. attenuata (ssp. orcuttii) Orcutt's Liveforever (Baja, Southern)
Dudleya brittonii Britton's Chalk Dudleya (Baja California)
Dudleya candelabra Candleholder Dudleya (Santa Cruz & Santa Rosa Islands)
Dudleya cymosa Canyon Liveforever, 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 macrostachya Pale or Common Spikerush (Statewide)
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 californica 'El Dorado' El Dorado Sunflower (Horitcultural, Southern)
Encelia farinosa Incienso (Southern)
Ephedra californica Mormon Tea (San Diego)
Epilobium canum California Fuschia (Southern, Central)
Epilobium canum 'Bert's Bluff' California Fuchsia 'Bert's Bluff' (Horticultural)
Epilobium 'Calistoga' Calistoga Fuchsia (Statewide, Baja)
Epilobium ‘Catalina’ Catalina Fuschia (Horticultural, Catalina Island)
Epilobium canum 'El Tigre' El Tigre Fuchsia (Horticultural selection from El Tigre Peak, Santa Cruz Island)
Epilobium ‘Everett's Choice’ Everett's Choice Fuschia (Horticultural)
Epilobium 'Route 66' Route 66 Fuschia (Horticultural)
Epilobium ciliatum (Epilobium californicum) Fringed Willowherb (Statewide)
Epilobium septentrionale 'Select Mattole' Humboldt County Fuchsia Select Mattole (Horticultural)
Epilobium septentrionale 'Waynes Silver' Wayne's Silver California Fuchsia (Selection from seed collected by Wayne Roderick)
Epipactis gigantea Stream Orchid (Statewide)
Equisetum arvense Common Horsetail
Ericameria cuneata Compact Goldenbush (Statewide)
Ericameria ericoides Mock Heather, California Goldenbush (Statewide)
Ericameria nauseosus Rubber Rabbitbush (Statewide, Baja California)
Ericameria palmeri Palmer's Goldenbush (Southern, Baja California)
Ericameria parishii Parish's Goldenbush (Southern)
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 compositum Arrowleaf Buckwheat (Northern)
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)
Eriogonum umbellatum polyanthum 'Shasta Sulfur' Shasta Sulphur Buckwheat (Horticultural selection from Mount Shasta)
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 idahoensis ‘Siskiyou Blue’ Idaho Fescue ‘Siskiyou Blue’ (Horticultural)
Festuca rubra 'Molate' Molate Red Fescue (Horticultural)
Fouquiera splendens Ocotillo (Southern)
Forestiera pubescens Desert Olive (Statewide)
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