| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Allium sharsmithiae | CNPS-EB: *A2 State CNPS: 1B.3 | Sharsmith's onion | |
| Amsinckia grandiflora | CNPS-EB: *A1 State CNPS: 1B.1 FESA Status: FE CESA Status: CE | large-flowered fiddleneck | |
| Amsinckia lunaris | CNPS-EB: *A2 State CNPS: 1B.2 | bent-flowered fiddleneck | |
| Arctostaphylos auriculata | CNPS-EB: *A2 State CNPS: 1B.3 | Mount Diablo manzanita | |
| Arctostaphylos manzanita subsp. laevigata | CNPS-EB: *A2 State CNPS: 1B.2 | Contra Costa manzanita | |
| Arctostaphylos pallida | CNPS-EB: *A2 State CNPS: 1B.1 FESA Status: FT CESA Status: CE | pallid manzanita | |
| Astragalus tener var. tener | CNPS-EB: *A2 State CNPS: 1B.2 | alkali milkvetch | |
| Atriplex depressa | CNPS-EB: *A2 State CNPS: 1B.2 | brittlescale | |
| Atriplex minuscula | CNPS-EB: *A2 State CNPS: 1B.1 | LESSER SALTSCALE | |
| Balsamorhiza macrolepis | CNPS-EB: *A1 State CNPS: 1B.2 | big-scale balsamroot | |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 | big tarplant | |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 | Mount Diablo fairy-lantern | |
| Calystegia purpurata subsp. saxicola | (historical-1893) (ssp. purpur | CNPS-EB: *A1x State CNPS: 1B.2 | coastal bluff morning-glory |
| Campanula exigua | CNPS-EB: *A2 State CNPS: 1B.2 | chaparral harebell | |
| Campanula sharsmithiae | CNPS-EB: *A1x State CNPS: 1B.2 | SHARSMITH'S HAREBELL | |
| Caulanthus lemmonii | (formerly C. coulteri var. l.) | CNPS-EB: *A1x State CNPS: 1B.2 | Lemmon's jewelflower |
| Centromadia parryi subsp. congdonii | (formerly Hemizonia p. ssp. c. | CNPS-EB: *A2 State CNPS: 1B.1 | Congdon's tarplant |
| Chlorogalum pomeridianum var. minus | CNPS-EB: *A1 State CNPS: 1B.2 | DWARF SOAPROOT | |
| Chloropyron maritimum subsp. palustre | (historical-1917) | CNPS-EB: *A1x State CNPS: 1B.2 | Point Reyes salty bird's-beak |
| Chloropyron molle subsp. hispidum | CNPS-EB: *A1 State CNPS: 1B.1 | hispid salty bird's-beak, hispid bird's-beak | |
| Chloropyron molle subsp. molle | CNPS-EB: *A2 State CNPS: 1B.2 FESA Status: FE CESA Status: CR | soft salty bird's-beak, soft bird's-beak | |
| Chloropyron palmatum | CNPS-EB: *A1 State CNPS: 1B.1 FESA Status: FE CESA Status: CE | palmate salty bird's-beak, palmate-bracted bird's-beak | |
| Chorizanthe cuspidata var. cuspidata | (historical-1881) | CNPS-EB: *A1x State CNPS: 1B.2 | San Francisco Bay spineflower |
| Chorizanthe robusta var. robusta | (historical-1913) | CNPS-EB: *A1x State CNPS: 1B.1 FESA Status: FE | robust spineflower |
| Cirsium andrewsii | CNPS-EB: *A1 State CNPS: 1B.2 | Franciscan thistle | |
| Cirsium fontinale var. campylon | CNPS-EB: *A1 State CNPS: 1B.2 | Mount Hamilton fountain thistle | |
| Clarkia franciscana | CNPS-EB: *A1 State CNPS: 1B.1 FESA Status: FE CESA Status: CE | Presidio clarkia | |
| Cordylanthus nidularius | CNPS-EB: *A1 State CNPS: 1B.1 CESA Status: CR | Mount Diablo bird's-beak | |
| Deinandra bacigalupii | (formerly Hemizonia increscens | CNPS-EB: *A1 State CNPS: 1B.1 CESA Status: CE | Livermore tarplant |
| Delphinium californicum subsp. interius | CNPS-EB: *A2 State CNPS: 1B.2 | Hospital Canyon larkspur | |
| Delphinium recurvatum | CNPS-EB: *A1x State CNPS: 1B.2 | recurved larkspur | |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 | western leatherwood | |
| Eriastrum ertterae | CNPS-EB: *A1 State CNPS: 1B.1 CESA Status: CE | Ertter's eriastrum | |
| Eriogonum luteolum var. caninum | CNPS-EB: *A2 State CNPS: 1B.2 | Tiburon buckwheat | |
| Eriogonum nudum var. psychicola | CNPS-EB: *A1 State CNPS: 1B.1 | Antioch Dunes buckwheat | |
| Eriogonum truncatum | CNPS-EB: *A1 State CNPS: 1B.1 | Mount Diablo buckwheat | |
| Eryngium aristulatum var. hooveri | CNPS-EB: *A1 State CNPS: 1B.1 | Hoover's button-celery | |
| Eryngium jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 | ||
| Eryngium racemosum | CNPS-EB: *A1x State CNPS: 1B.1 CESA Status: CE | delta button-celery | |
| Eryngium spinosepalum | CNPS-EB: *A2 State CNPS: 1B.2 | ||
| Erysimum capitatum var. angustatum | (ssp. capitatum is more common | CNPS-EB: *A1 State CNPS: 1B.1 FESA Status: FE CESA Status: CE | Contra Costa wallflower |
| Eschscholzia rhombipetala | CNPS-EB: *A1 State CNPS: 1B.1 | diamond-petaled California poppy | |
| Extriplex joaquinana | CNPS-EB: *A2 State CNPS: 1B.2 | San Joaquin spearscale, San Joaquin saltbush | |
| Fritillaria falcata | CNPS-EB: *A1 State CNPS: 1B.2 | talus fritillary | |
| Fritillaria liliacea | CNPS-EB: *A2 State CNPS: 1B.2 | fragrant fritillary | |
| Gilia millefoliata | CNPS-EB: *A1x State CNPS: 1B.2 | DARK-EYED GILIA | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 | Diablo helianthella | |
| Hesperolinon breweri | CNPS-EB: *A2 State CNPS: 1B.2 | Brewer's western flax | |
| Hesperolinon tehamense | 3 questionable ID sites. Needs field research | CNPS-EB: *A1? State CNPS: 1B.3 | Napa western flax |
| Hibiscus lasiocarpos var. occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 | rose-mallow | |
| Holocarpha macradenia | CNPS-EB: *A1 State CNPS: 1B.1 FESA Status: FT CESA Status: CE | Santa Cruz tarplant | |
| Horkelia cuneata var. sericea | (historical-1894) | CNPS-EB: *A1x State CNPS: 1B.1 | Kellogg's horkelia |
| Isocoma arguta | (historical-date unknown) | CNPS-EB: *A1x State CNPS: 1B.1 | Carquinez goldenbush |
| Lasthenia conjugens | CNPS-EB: *A2 State CNPS: 1B.1 FESA Status: FE | Contra Costa goldfields | |
| Lathyrus jepsonii var. jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 | delta tule pea, Delta tule pea | |
| Legenere limosa | CNPS-EB: *A1 State CNPS: 1B.1 | legenere | |
| Leptosyne hamiltonii | (formerly Coreopsis h.) | CNPS-EB: *A1 State CNPS: 1B.2 | Mount Hamilton coreopsis |
| Lilaeopsis masonii | CNPS-EB: *A2 State CNPS: 1B.1 CESA Status: CR | Mason's lilaeopsis | |
| Madia radiata | (historical-1941) | CNPS-EB: *A1x State CNPS: 1B.1 | showy golden madia, showy madia |
| Malacothamnus hallii | (M. fasciculatus in Jepson Man | CNPS-EB: *A2 State CNPS: 1B.2 | Hall's bush-mallow |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 | Oregon meconella | |
| Monolopia gracilens | CNPS-EB: *A2 State CNPS: 1B.2 | woodland woollythreads, woodland monolopia | |
| Navarretia gowenii | CNPS-EB: *A2 State CNPS: 1B.1 | Lime Ridge navarretia | |
| Navarretia nigelliformis subsp. radians | CNPS-EB: *A1 State CNPS: 1B.2 | shining navarretia | |
| Navarretia prostrata | CNPS-EB: *A1 State CNPS: 1B.2 | prostrate vernal pool navarretia | |
| Oenothera deltoides subsp. howellii | CNPS-EB: *A2 State CNPS: 1B.1 FESA Status: FE CESA Status: CE | Antioch Dunes evening-primrose | |
| Phacelia phacelioides | CNPS-EB: *A2 State CNPS: 1B.2 | Mount Diablo phacelia | |
| Plagiobothrys chorisianus var. chorisianus | (historical-1890) | CNPS-EB: *A1x State CNPS: 1B.2 | Choris' popcornflower |
| Plagiobothrys diffusus | CNPS-EB: *A1x State CNPS: 1B.1 CESA Status: CE | San Francisco popcornflower | |
| Puccinellia simplex | CNPS-EB: *A2 State CNPS: 1B.2 | little alkali grass | |
| Sanicula maritima | (historical-1936) | CNPS-EB: *A1x State CNPS: 1B.1 CESA Status: CR | adobe sanicle |
| Sanicula saxatilis | CNPS-EB: *A2 State CNPS: 1B.2 CESA Status: CR | rock sanicle | |
| Spergularia macrotheca var. longistyla | CNPS-EB: *A2 State CNPS: 1B.2 | large-flowered sand spurry | |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 | most beautiful jewel-flower | |
| Streptanthus hispidus | CNPS-EB: *A2 State CNPS: 1B.3 | Mount Diablo jewelflower | |
| Suaeda californica | (historical-1958) | CNPS-EB: *A1x State CNPS: 1B.1 FESA Status: FE | California seablite |
| Symphyotrichum lentum | (formerly Aster lentus) | CNPS-EB: *A2 State CNPS: 1B.2 | Suisun marsh aster |
| Trifolium hydrophilum | (vars. amplectens and truncatu | CNPS-EB: *A2 State CNPS: 1B.2 | saline clover |
| Tropidocarpum capparideum | CNPS-EB: *A1 State CNPS: 1B.1 | caper-fruited tropidocarpum |