| Scientific Name | Notes | Rarity Ranks | Common Name | Num Pops |
|---|---|---|---|---|
| Abronia latifolia | (historical-1894) | CNPS-EB: A1x | yellow sand-verbena | 0 |
| Abronia umbellata var. umbellata | (historical-1937) | CNPS-EB: A1x | beach sand-verbena | 0 |
| Acanthomintha lanceolata | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | Santa Clara thornmint | 11 | |
| Acmispon denticulatus | (historical-1945) | CNPS-EB: A1x | meadow trefoil | 0 |
| Acmispon junceus var. biolettii | (historical-1945) | CNPS-EB: A1x | rush lotus | 0 |
| Acmispon junceus var. junceus | CNPS-EB: A1 | 1 | ||
| Adiantum aleuticum | (A. jordanii is more common) | CNPS-EB: A1 | five-finger fern | 4 |
| Agoseris retrorsa | CNPS-EB: A2 | spear-leaved agoseris | 12 | |
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | 8 | |
| Allium acuminatum | CNPS-EB: A1 | Hooker's onion | 4 | |
| Allium amplectens | CNPS-EB: A2 | narrow-leaved onion | 5 | |
| Allium bolanderi var. bolanderi | CNPS-EB: A1 | Bolander's onion | 5 | |
| Allium crispum | CNPS-EB: A1 | crinkled onion | 1 | |
| Allium falcifolium | CNPS-EB: A2 | sickle-leaved onion | 8 | |
| Allium peninsulare var. peninsulare | (historical-1954) | CNPS-EB: A1x | peninsular onion | 0 |
| Allium sharsmithiae | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Sharsmith's onion | 10 | |
| Allophyllum gilioides subsp. gilioides | CNPS-EB: A2 | straggling gilia | 9 | |
| Alnus rubra | (A. rhombifolia is more common | CNPS-EB: A2 | red alder | 4 |
| Amaranthus palmeri | CNPS-EB: A1x | Palmer's amaranth | 1 | |
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | 2 | |
| Ammannia coccinea | CNPS-EB: A2 | long-leaved ammannia | 5 | |
| Amsinckia douglasiana | (historical-1938) | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | Douglas' fiddleneck | 0 |
| Amsinckia eastwoodiae | CNPS-EB: A1 | Eastwood's fiddleneck | 3 | |
| Amsinckia grandiflora | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | large-flowered fiddleneck | 1 | |
| Amsinckia lunaris | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | bent-flowered fiddleneck | 30 | |
| Amsinckia tessellata var. gloriosa | CNPS-EB: A1 | carrizo fiddleneck, tessellate fiddleneck | 1 | |
| Amsinckia tessellata var. tessellata | CNPS-EB: A1 | desert fiddleneck, devil's lettuce | 3 | |
| Amsinckia vernicosa | CNPS-EB: A1 | waxy fiddleneck, forked fiddleneck | 1 | |
| Androsace elongata subsp. acuta | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5?T3T4 CNDDB Rank: S3S4 | California androsace | 13 | |
| Anthoxanthum occidentale | (historical-198? but not seen | CNPS-EB: A1x | California sweet grass, vanilla grass | 0 |
| Antirrhinum kelloggii | CNPS-EB: A1 | lax snapdragon | 7 | |
| Antirrhinum thompsonii | (formerly A. multiflorum) | CNPS-EB: A1 | withered snapdragon | 3 |
| Aphyllon californicum subsp. jepsonii | CNPS-EB: A1 | Jepson broom-rape | 3 | |
| Aphyllon epigalium subsp. epigalium | CNPS-EB: A1 | 4 | ||
| Aphyllon pinorum | CNPS-EB: A1 | pine broom-rape | 2 | |
| Apocynum androsaemifolium | CNPS-EB: A2 | bitter dogbane, dogbane | 6 | |
| Aquilegia eximia | (A. formosa is more common) | CNPS-EB: A2 | Van Houtte's columbine | 4 |
| Arabis blepharophylla | CNPS-EB: *A1x State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | coast rockcress | 0 | |
| Arctostaphylos auriculata | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo manzanita | 12 | |
| Arctostaphylos crustacea subsp. rosei | CNPS-EB: A1 | Rose's manzanita | 1 | |
| Arctostaphylos glandulosa subsp. cushingiana | CNPS-EB: A1x | CUSHING MANZANITA | 0 | |
| Arctostaphylos glandulosa subsp. glandulosa | CNPS-EB: A2 | Eastwood manzanita | 6 | |
| Arctostaphylos glandulosa subsp. mollis | CNPS-EB: A1x | 0 | ||
| Arctostaphylos manzanita subsp. laevigata | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Contra Costa manzanita | 11 | |
| Arctostaphylos manzanita subsp. manzanita | CNPS-EB: A2 | common manzanita | 5 | |
| Arctostaphylos pallida | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | pallid manzanita | 11 | |
| Argemone munita | CNPS-EB: A1 | chicalote, prickly poppy | 1 | |
| Aristida oligantha | Questionable ID at Los Vaqueros. Needs research | CNPS-EB: A1? | oldfield three-awn | 0 |
| Artemisia dracunculus | CNPS-EB: A2 | tarragon | 4 | |
| Artemisia pycnocephala | (historical-1936) | CNPS-EB: A1x | coastal sagewort | 0 |
| Arthrocnemum subterminale | CNPS-EB: A2 | Parish's glasswort | 5 | |
| Asclepias cordifolia | (A. californica is more common | CNPS-EB: A1 | purple milkweed | 3 |
| Asclepias eriocarpa | CNPS-EB: A1 | KOTOLO | 2 | |
| Aspidotis californica | CNPS-EB: A2 | California lace fern | 5 | |
| Aspidotis carlotta-halliae | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Carlotta Hall's lace fern | 0 | |
| Aspidotis densa | CNPS-EB: A1x | dense lace fern, Indian's dream | 0 | |
| Astragalus didymocarpus var. didymocarpus | (A. gambelianus is more common | CNPS-EB: A1 | two-seeded milkvetch | 2 |
| Astragalus nuttallii var. nuttallii | (historical-1866) | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G4T4 CNDDB Rank: S4 | ocean bluff milkvetch, Nuttall's milk-vetch | 0 |
| Astragalus nuttallii var. virgatus | (historical-1881) | CNPS-EB: A1x | Nuttall's milk-vetch | 0 |
| Astragalus tener var. tener | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T1 CNDDB Rank: S1 | alkali milkvetch | 5 | |
| Athysanus unilateralis | (formerly Heterodraba unilateralis) | CNPS-EB: A1 | heterodraba | 1 |
| Atriplex coronata var. coronata | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4T3 CNDDB Rank: S3 | crownscale | 13 | |
| Atriplex depressa | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | brittlescale | 12 | |
| Atriplex dioica | (formerly A. subspicata) | CNPS-EB: A1x | thickleaf orach, saltbush | 0 |
| Atriplex gmelinii var. gmelinii | (historical-1897) | CNPS-EB: A1x | Gmelin's saltbush, spear saltbush | 0 |
| Atriplex minuscula | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 | LESSER SALTSCALE | 5 | |
| Atriplex serenana var. serenana | CNPS-EB: A1 | bractscale | 1 | |
| Balsamorhiza macrolepis | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | big-scale balsamroot | 2 | |
| Berberis aquifolium var. dictyota | CNPS-EB: A1 | Jepson's mahonia | 2 | |
| Berberis nervosa | (B. pinnata is more common) | CNPS-EB: A1 | Oregon grape | 1 |
| Bidens laevis | CNPS-EB: A2 | bur-marigold | 7 | |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1G2 CNDDB Rank: S1S2 | big tarplant | 18 | |
| Bolboschoenus fluviatilis | (formerly Scirpus f.) | CNPS-EB: A1x | river bulrush | 0 |
| Bromus sitchensis var. maritimus | (formerly B. maritimus) | CNPS-EB: A1 | maritime brome, seaside brome grass | 1 |
| Calamagrostis koelerioides | 2 questionable ID sites. Needs field research | CNPS-EB: A1? | tufted pine grass | 0 |
| Calamagrostis nutkaensis | (historical-18??) | CNPS-EB: A1x | Pacific reed grass | 0 |
| Calamagrostis rubescens | CNPS-EB: A2 | pine reed grass, pine grass | 5 | |
| Calandrinia breweri | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | Brewer's calandrinia | 9 | |
| Calochortus clavatus var. pallidus | CNPS-EB: A1 | club-haired mariposa-lily | 1 | |
| Calochortus invenustus | CNPS-EB: A1x | plain mariposa-lily | 0 | |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | 37 | |
| Calochortus splendens | CNPS-EB: A2 | splendid mariposa-lily | 13 | |
| Calochortus umbellatus | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3? CNDDB Rank: S3? | Oakland star-tulip | 39 | |
| Calycadenia multiglandulosa | CNPS-EB: A2 | sticky calycadenia | 5 | |
| Calystegia malacophylla subsp. pedicellata | CNPS-EB: A2 | woolly morning-glory | 10 | |
| Calystegia purpurata subsp. saxicola | (historical-1893) (ssp. purpur | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G4T2T3 CNDDB Rank: S2S3 | coastal bluff morning-glory | 0 |
| Calystegia soldanella | (historical-1893) | CNPS-EB: A1x | beach morning-glory | 0 |
| Camissonia campestris subsp. campestris | (historical-1940) | CNPS-EB: A1x | Mojave suncup | 0 |
| Camissonia strigulosa | CNPS-EB: A1 | contorted primrose | 4 | |
| Camissoniopsis cheiranthifolia subsp. cheiranthifolia | CNPS-EB: A1 | dune suncup | 1 | |
| Camissoniopsis hirtella | CNPS-EB: A2 | small primrose | 6 | |
| Campanula exigua | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | chaparral harebell | 11 | |
| Campanula griffinii | CNPS-EB: A1 | Griffin's campanula | 5 | |
| Campanula sharsmithiae | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G1G2 CNDDB Rank: S1S2 | SHARSMITH'S HAREBELL | 0 | |
| Carex aquatilis var. dives | CNPS-EB: A1 | Sitka sedge | 1 | |
| Carex brevicaulis | CNPS-EB: A2 | short-stemmed sedge | 6 | |
| Carex comosa | CNPS-EB: *A1x State CNPS: 2B.1 Global Rank: G5 CNDDB Rank: S2 | bristly sedge | 0 | |
| Carex gracilior | CNPS-EB: A1 | slender sedge | 1 | |
| Carex laeviculmis | CNPS-EB: A1 | smooth-stemmed sedge | 1 | |
| Carex lenticularis var. lipocarpa | CNPS-EB: A1 | few-ribbed sedge | 2 | |
| Carex leporina | (formerly Carex ovalis) | CNPS-EB: A1 | hare sedge, oval sedge, mountain hare sedge | 1 |
| Carex leptopoda | (formerly Carex deweyana subsp leptopoda | CNPS-EB: A2 | slender-footed sedge, short-scaled sedge | 5 |
| Carex multicostata | CNPS-EB: A1 | many-ribbed sedge | 1 | |
| Carex pellita | (formerly C. lanuginosa) | CNPS-EB: A1 | woolly sedge | 2 |
| Carex senta | CNPS-EB: A1 | western rough sedge, rough sedge | 2 | |
| Carex unilateralis | CNPS-EB: A1 | one-sided sedge | 1 | |
| Castilleja ambigua subsp. ambigua | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5T4 CNDDB Rank: S3S4 | Johnny-nip | 4 | |
| Castilleja applegatei subsp. martinii | CNPS-EB: A2 | wavy-leaved indian paintbrush | 4 | |
| Castilleja exserta subsp. latifolia | CNPS-EB: A1 | owl's-clover | 1 | |
| Castilleja subinclusa subsp. franciscana | CNPS-EB: A1 | Franciscan indian paintbrush | 2 | |
| Castilleja subinclusa subsp. subinclusa | CNPS-EB: A1 | long-leaved indian paintbrush | 3 | |
| Caulanthus flavescens | CNPS-EB: A2 | yellow-flowered thelypodium | 4 | |
| Caulanthus lemmonii | (formerly C. coulteri var. l.) | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | Lemmon's jewelflower | 0 |
| Ceanothus leucodermis | CNPS-EB: A2 | chaparral whitethorn | 9 | |
| Centromadia parryi subsp. congdonii | (formerly Hemizonia p. ssp. c. | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G3T2 CNDDB Rank: S2 | Congdon's tarplant | 17 |
| Cephalanthus occidentalis | CNPS-EB: A2 | button bush | 5 | |
| Cercis occidentalis | CNPS-EB: A1x | western redbud | 0 | |
| Chaenactis glabriuscula var. glabriuscula | CNPS-EB: A1 | yellow pincushion | 1 | |
| Chaenactis glabriuscula var. heterocarpha | CNPS-EB: A1 | inner coast range pincushion, yellow pincushion | 3 | |
| Chaenactis glabriuscula var. megacephala | CNPS-EB: A1 | yellow pincushion | 1 | |
| Chenopodium berlandieri var. sinuatum | CNPS-EB: A1 | 1 | ||
| Chenopodium berlandieri var. unknown | Split into 2 varieties. Sites need to be surveyed to determine vars.. | CNPS-EB: A2? | pitseed goosefoot | 3 |
| Chenopodium berlandieri var. zschackei | CNPS-EB: A1? | |||
| Chenopodium pratericola | CNPS-EB: A1 | 3 | ||
| Chenopodium rubrum | CNPS-EB: A1 | red pigweed, red goosefoot | 2 | |
| Chenopodium rubrum var. humile | CNPS-EB: A1? | |||
| Chenopodium rubrum var. rubrum | CNPS-EB: A1? | 0 | ||
| Chlorogalum pomeridianum var. minus | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G5T3 CNDDB Rank: S3 | DWARF SOAPROOT | 1 | |
| Chloropyron maritimum subsp. palustre | (historical-1917) | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G4?T2 CNDDB Rank: S2 | Point Reyes salty bird's-beak | 0 |
| Chloropyron molle subsp. hispidum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G2T1 CNDDB Rank: S1 | hispid salty bird's-beak, hispid bird's-beak | 1 | |
| Chloropyron molle subsp. molle | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T1 CNDDB Rank: S1 FESA Status: FE CESA Status: CR | soft salty bird's-beak, soft bird's-beak | 4 | |
| Chloropyron palmatum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | palmate salty bird's-beak, palmate-bracted bird's-beak | 1 | |
| Chorizanthe cuspidata var. cuspidata | (historical-1881) | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G2T1 CNDDB Rank: S1 | San Francisco Bay spineflower | 0 |
| Chorizanthe polygonoides var. polygonoides | CNPS-EB: A1 | knotweed spineflower | 2 | |
| Chorizanthe robusta var. robusta | (historical-1913) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G2T1 CNDDB Rank: S1 FESA Status: FE | robust spineflower | 0 |
| Chorizanthe uniaristata | (historical-1884) | CNPS-EB: A1x | one-awn spineflower | 0 |
| Chrysolepis chrysophylla var. minor | CNPS-EB: A2 | golden chinquapin | 6 | |
| Cicendia quadrangularis | CNPS-EB: A2 | timwort | 7 | |
| Cicuta douglasii | CNPS-EB: A2 | water-hemlock | 3 | |
| Cicuta maculata var. bolanderi | CNPS-EB: *A1 State CNPS: 2B.1 Global Rank: G5T4T5 CNDDB Rank: S2? | Bolander's water-hemlock, water hemlock | 1 | |
| Cirsium andrewsii | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | Franciscan thistle | 2 | |
| Cirsium douglasii var. douglasii | CNPS-EB: A1 | swamp thistle | 3 | |
| Cirsium fontinale var. campylon | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | Mount Hamilton fountain thistle | 3 | |
| Cirsium occidentale var. californicum | (var. venustum is more common) | CNPS-EB: A2 | California thistle | 9 |
| Cirsium occidentale var. coulteri | CNPS-EB: A1x | COULTER'S THISTLE | 0 | |
| Cirsium occidentale var. occidentale | CNPS-EB: A1x | COBWEBBY THISTLE | 0 | |
| Cirsium quercetorum | CNPS-EB: A2 | brownie thistle | 7 | |
| Cirsium remotifolium var. odontolepis | CNPS-EB: A1 | remote-leaved thistle | 1 | |
| Clarkia biloba subsp. biloba | CNPS-EB: A2 | lobed godetia | 10 | |
| Clarkia breweri | CNPS-EB: *A1 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | Brewer's clarkia | 1 | |
| Clarkia concinna subsp. automixa | (ssp. concinna is more common) | CNPS-EB: *A2 State CNPS: 4.3 Global Rank: G5?T3 CNDDB Rank: S3 | Santa Clara red ribbons | 5 |
| Clarkia epilobioides | CNPS-EB: A1 | 1 | ||
| Clarkia franciscana | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | Presidio clarkia | 6 | |
| Clarkia modesta | CNPS-EB: A2 | modest clarkia | 8 | |
| Clarkia purpurea subsp. purpurea | (ssp. quadrivulnera is more co | CNPS-EB: A2 | purple clarkia | 5 |
| Clarkia purpurea subsp. unknown | CNPS-EB: A1? | clarkia | ||
| Clarkia purpurea subsp. viminea | (ssp. quadrivulnera more common | CNPS-EB: A1 | large godetia | 1 |
| Clarkia rhomboidea | CNPS-EB: A1 | 5 | ||
| Clarkia tembloriensis subsp. tembloriensis | CNPS-EB: A1 | temblor clarkia | 2 | |
| Claytonia exigua subsp. glauca | (ssp. exigua is more common) | CNPS-EB: A1x | claytonia | 0 |
| Claytonia rubra subsp. depressa | CNPS-EB: A1x | miner's lettuce | 0 | |
| Clintonia andrewsiana | CNPS-EB: A1 | red clintonia | 2 | |
| Collinsia bartsiifolia var. bartsiifolia | CNPS-EB: A1x | white Chinese houses | 0 | |
| Collinsia bartsiifolia var. stricta | Highly unlikely it occurs here. Only 1 population but ID is very questionable | CNPS-EB: A1? | white Chinese houses | 0 |
| Collinsia bartsiifolia var. unknown | CNPS-EB: A1? | white Chinese houses | 0 | |
| Collinsia tinctoria | CNPS-EB: A2 | iodine collinsia | 9 | |
| Collomia diversifolia | CNPS-EB: *A1 State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | serpentine collomia | 1 | |
| Collomia heterophylla | CNPS-EB: A1 | variable-leaf collomia | 3 | |
| Convolvulus simulans | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | small-flowered morning-glory | 4 | |
| Corallorhiza maculata var. maculata | (forma immaculata is more comm | CNPS-EB: A2 | spotted coralroot | 4 |
| Corallorhiza striata | (C. maculata is more common) | CNPS-EB: A1x | striped coralroot | 0 |
| Cordylanthus nidularius | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CR | Mount Diablo bird's-beak | 2 | |
| Cordylanthus rigidus subsp. rigidus | CNPS-EB: A2 | stiffly-branched bird's-beak | 4 | |
| Cornus glabrata | CNPS-EB: A1 | brown dogwood | 3 | |
| Crassula solieri | (C. connata and aquatica are more common) | CNPS-EB: A1x | pygmy-weed | 0 |
| Crocidium multicaule | CNPS-EB: A1 | spring gold | 3 | |
| Croton californicus | CNPS-EB: A2 | California croton | 5 | |
| Cryptantha clevelandii var. florosa | CNPS-EB: A2 | Cleveland's cryptantha | 6 | |
| Cryptantha corollata | formerly C. decipiens. Also includes previous records for C. rattanii | CNPS-EB: A2 | COAST RANGE CRYPTANTHA | 6 |
| Cryptantha hooveri | (historical-1908) | CNPS-EB: *A1x State CNPS: 1A Global Rank: GH CNDDB Rank: SH | Hoover's cryptantha | 0 |
| Cryptantha juniperensis | (formerly C. nevadensis var. rigida) | CNPS-EB: A1 | Nevada cryptantha | 4 |
| Cryptantha micromeres | CNPS-EB: A2 | minute-flowered cryptantha | 5 | |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | 9 | |
| Cryptantha muricata var. muricata | CNPS-EB: A1 | showy prickly-nut cryptantha | 2 | |
| Cryptantha nemaclada | CNPS-EB: A1x | Colusa cryptantha | 0 | |
| Cucurbita foetidissima | CNPS-EB: A1 | buffalo gourd, calabazilla, calabazilla | 2 | |
| Cuscuta californica var. californica | CNPS-EB: A1 | California dodder | 3 | |
| Cuscuta campestris | CNPS-EB: A2 | field dodder | 5 | |
| Cuscuta indecora var. indecora | CNPS-EB: A1x | large-seeded dodder, pretty dodder | 1 | |
| Cuscuta occidentalis | (formerly C. californica var. | CNPS-EB: A1x | California dodder | 0 |
| Cyperus niger | CNPS-EB: A2 | black sedge | 6 | |
| Cyperus odoratus | CNPS-EB: A1 | coarse cyperus | 1 | |
| Cyperus strigosus | CNPS-EB: A1 | false nutsedge, straw-colored cyperus | 1 | |
| Deinandra bacigalupii | (formerly Hemizonia increscens | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CE | Livermore tarplant | 2 |
| Deinandra corymbosa | (formerly Hemizonia corymbosa) | CNPS-EB: A2 | coast tarweed | 5 |
| Deinandra kelloggii | (formerly Hemizonia k.) | CNPS-EB: A2 | Kellogg's tarweed | 6 |
| Delphinium californicum subsp. interius | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3T3 CNDDB Rank: S3 | Hospital Canyon larkspur | 8 | |
| Delphinium gypsophilum | CNPS-EB: A1 | gypsum-loving larkspur | 1 | |
| Delphinium hansenii subsp. hansenii | CNPS-EB: A2 | Hansen's larkspur | 5 | |
| Delphinium parryi subsp. parryi | CNPS-EB: A2 | Parry's larkspur | 8 | |
| Delphinium recurvatum | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G2? CNDDB Rank: S2 | recurved larkspur | 0 | |
| Dendromecon rigida | CNPS-EB: A2 | bush poppy | 7 | |
| Descurainia pinnata subsp. brachycarpa | CNPS-EB: A1x | tansy mustard | 0 | |
| Dicentra formosa | CNPS-EB: A2 | Pacific bleeding heart, bleeding heart | 7 | |
| Dichelostemma multiflorum | CNPS-EB: A1x | wild hyacinth, many-flowered brodiaea | 0 | |
| Dichelostemma volubile | 2 questionable ID sites. Needs field research | CNPS-EB: A1? | twining brodiaea, snake lily | 0 |
| Dichondra donelliana | CNPS-EB: A1 | dichondra | 2 | |
| Diplacus bolanderi | (formerly Mimulus b.) | CNPS-EB: A1 | Bolander's monkeyflower | 1 |
| Diplacus douglasii | (formerly Mimulus d.) | CNPS-EB: A2 | Douglas monkeyflower | 9 |
| Diplacus kelloggii | (formerly Mimulus kelloggii) | CNPS-EB: A1x | Kellogg's monkeyflower | 0 |
| Diplacus rattanii | (formerly Mimulus rattanii) | CNPS-EB: A2 | Rattan monkeyflower | 4 |
| Diplacus tricolor | (formerly Mimulus tricolor) | CNPS-EB: A1x | tricolor monkeyflower | 0 |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | 54 | |
| Downingia bella | CNPS-EB: A1x | Hoover's downingia | 0 | |
| Downingia cuspidata | CNPS-EB: A1 | cuspidate downingia | 2 | |
| Downingia insignis | CNPS-EB: A1 | cupped downingia | 3 | |
| Downingia ornatissima var. mirabilis | (historical-1956; formerly D. ornatissima var. eximia) | CNPS-EB: A1x | Solano downingia | 0 |
| Draba cuneifolia | CNPS-EB: A1 | Sonora draba | 2 | |
| Dudleya cymosa subsp. cymosa | (ssp. paniculata is more common) | CNPS-EB: A1 | spreading dudleya | 1 |
| Dudleya farinosa | CNPS-EB: A2 | bluff lettuce, powdery dudleya | 7 | |
| Eastwoodia elegans | Unclear if it occurs here | CNPS-EB: A1? | yellow mock aster | 0 |
| Echinodorus berteroi | CNPS-EB: A2 | burhead | 6 | |
| Eclipta prostrata | CNPS-EB: A1 | false daisy | 3 | |
| Elatine brachysperma | CNPS-EB: A1 | waterwort | 2 | |
| Elatine californica | CNPS-EB: A1 | waterwort | 4 | |
| Eleocharis parishii | CNPS-EB: A1 | Dombey's spike-rush | 3 | |
| Eleocharis parvula | CNPS-EB: *A1 State CNPS: 4.3 Global Rank: G5 CNDDB Rank: S3 | small spikerush | 1 | |
| Eleocharis rostellata | (historical-1933) | CNPS-EB: A1x | beaked spike-rush | 0 |
| Elymus mollis subsp. mollis | CNPS-EB: A1x | American dune grass, sea lyme grass | 0 | |
| Elymus stebbinsii | CNPS-EB: A1x | Stebbins' wheat grass, Parish's wheat-grass | 0 | |
| Elymus trachycaulus subsp. trachycaulus | CNPS-EB: A1 | slender wheat grass | 2 | |
| Elymus xsaundersii | CNPS-EB: A1x | 0 | ||
| Emmenanthe rosea | (formerly E. penduliflora var. rosea) | CNPS-EB: A1x | 0 | |
| Enemion occidentale | (formerly Isopyrum o.) | CNPS-EB: A2 | western rue-anemone | 9 |
| Enemion stipitatum | (formerly Isopyrum s.) | CNPS-EB: A2 | Siskiyou rue-anemone | 5 |
| Ephedra californica | 2 questionable ID sites. Needs field research | CNPS-EB: A1? | desert tea, Mormon tea | 0 |
| Ephedra viridis | Questionable ID. Needs field research | CNPS-EB: A1? | green ephedra | 0 |
| Epilobium ciliatum subsp. watsonii | (ssp. ciliatum is more common) | CNPS-EB: A1 | San Francisco willowherb | 1 |
| Epilobium cleistogamum | CNPS-EB: A1 | cleistogamous boisduvalia | 3 | |
| Epilobium torreyi | CNPS-EB: A2 | narrow-leaved boisduvalia | 7 | |
| Epipactis gigantea | CNPS-EB: A1 | stream orchid | 1 | |
| Equisetum laevigatum | CNPS-EB: A2 | smooth scouring rush | 5 | |
| Eragrostis hypnoides | CNPS-EB: A2 | 4 | ||
| Eragrostis mexicana subsp. virescens | CNPS-EB: A1 | Orcutt's eragrostis | 1 | |
| Eremalche exilis | CNPS-EB: A1 | WHITE MALLOW | 1 | |
| Eremalche parryi subsp. parryi | CNPS-EB: A1 | Parry's mallow | 2 | |
| Eremothera boothii subsp. decorticans | (formerly Camissonia boothii subsp. decorticans) | CNPS-EB: A1 | shredding evening-primrose | 2 |
| Eriastrum abramsii | CNPS-EB: A2 | Abram's eriastrum | 6 | |
| Eriastrum ertterae | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CE | Ertter's eriastrum | 2 | |
| Eriastrum pluriflorum subsp. pluriflorum | CNPS-EB: A1 | many-flowered eriastrum | 1 | |
| Ericameria nauseosa var. mohavensis | CNPS-EB: A2 | Mojave rabbitbrush, rubber rabbitbrush | 11 | |
| Erigeron reductus var. angustatus | CNPS-EB: A1 | California rayless daisy | 1 | |
| Eriogonum covilleanum | CNPS-EB: A2 | Coville's wild buckwheat, Coville's eriogonum | 7 | |
| Eriogonum deserticola | CNPS-EB: A1x | Colorado desert wild buckwheat, desert eriogonum | 0 | |
| Eriogonum fasciculatum var. foliolosum | CNPS-EB: A1 | leafy California buckwheat, California buckwheat | 3 | |
| Eriogonum fasciculatum var. polifolium | CNPS-EB: A2 | Mojave desert California buckwheat, California buckwheat | 4 | |
| Eriogonum inerme var. inerme | CNPS-EB: A1 | unarmed buckwheat | 1 | |
| Eriogonum luteolum var. caninum | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Tiburon buckwheat | 6 | |
| Eriogonum luteolum var. luteolum | CNPS-EB: A2 | golden-carpet wild buckwheat, golden carpet | 6 | |
| Eriogonum nudum var. pauciflorum | CNPS-EB: A1 | little-flower wild buckwheat | 3 | |
| Eriogonum nudum var. psychicola | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 | Antioch Dunes buckwheat | 2 | |
| Eriogonum nudum var. pubiflorum | CNPS-EB: A1x | Fremont's wild buckwheat, naked-stemmed buckwheat | 0 | |
| Eriogonum roseum | CNPS-EB: A2 | wand wild buckwheat, virgate buckwheat | 7 | |
| Eriogonum truncatum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Mount Diablo buckwheat | 2 | |
| Eriogonum umbellatum var. bahiiforme | Previously mis-recorded as var. smallianum which does not occur in the East Bay | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5T3 CNDDB Rank: S3 | Small's sulphur flower, bay buckwheat | 13 |
| Eriophyllum jepsonii | CNPS-EB: *A2 State CNPS: 4.3 Global Rank: G3 CNDDB Rank: S3 | Jepson's woolly sunflower | 8 | |
| Eriophyllum staechadifolium | CNPS-EB: A2 | seaside woolly sunflower, lizard-tail | 7 | |
| Eryngium aristulatum var. aristulatum | CNPS-EB: A2 | 5 | ||
| Eryngium aristulatum var. hooveri | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 | Hoover's button-celery | 3 | |
| Eryngium armatum | CNPS-EB: A1 | coastal button-celery, coast coyote-thistle | 3 | |
| Eryngium articulatum | CNPS-EB: A1 | beethistle, coyote-thistle | 5 | |
| Eryngium castrense | CNPS-EB: A2 | great valley coyote-thistle, Vasey's coyote-thistle | 4 | |
| Eryngium jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | 18 | ||
| Eryngium racemosum | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CE | delta button-celery | 0 | |
| Eryngium spinosepalum | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | 4 | ||
| Eryngium vaseyi var. vallicola | CNPS-EB: A1 | coyote-thistle, Vasey's coyote-thistle | 1 | |
| Erysimum capitatum var. angustatum | (ssp. capitatum is more common | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | Contra Costa wallflower | 2 |
| Erythranthe cf. scouleri | CNPS-EB: A1 | 5 | ||
| Erythranthe floribunda | (formerly Mimulus floribundus) | CNPS-EB: A1? | floriferous monkeyflower | 0 |
| Erythranthe inconspicua | CNPS-EB: *A1 State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | 1 | ||
| Erythranthe latidens | (formerly Mimulus latidens) | CNPS-EB: A1 | broad-toothed monkeyflower | 2 |
| Erythranthe microphylla | CNPS-EB: A1x | 0 | ||
| Eschscholzia caespitosa | CNPS-EB: A1 | tufted poppy | 2 | |
| Eschscholzia rhombipetala | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | diamond-petaled California poppy | 3 | |
| Euonymus occidentalis var. occidentalis | CNPS-EB: A1 | burning bush | 1 | |
| Extriplex californica | (historical-1921) | CNPS-EB: A1x | California orach, California saltbush | 0 |
| Extriplex joaquinana | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | San Joaquin spearscale, San Joaquin saltbush | 22 | |
| Festuca elmeri | CNPS-EB: A1 | Elmer's fescue | 4 | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | 13 | |
| Fremontodendron californicum | CNPS-EB: A1 | flannelbush | 1 | |
| Fritillaria agrestis | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | stinkbells | 9 | |
| Fritillaria falcata | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | talus fritillary | 1 | |
| Fritillaria liliacea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | fragrant fritillary | 5 | |
| Galium andrewsii subsp. gatense | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5T3 CNDDB Rank: S3 | phlox-leaf serpentine bedstraw, serpentine bedstraw | 30 | |
| Galium porrigens var. tenue | (var. porrigens is more common | CNPS-EB: A1 | climbing bedstraw | 1 |
| Galium trifidum subsp. columbianum | CNPS-EB: A1 | trifid bedstraw | 3 | |
| Garrya congdonii | CNPS-EB: A1x | Congdon's silk-tassel | 0 | |
| Garrya flavescens | CNPS-EB: A2 | silk tassel bush | 6 | |
| Garrya fremontii | CNPS-EB: A1x | silk tassel bush | 0 | |
| Gaultheria shallon | CNPS-EB: A1 | salal | 1 | |
| Gilia capitata subsp. capitata | CNPS-EB: A1 | blue field gilia | 3 | |
| Gilia capitata subsp. unknown | CNPS-EB: A1? | blue field gilia | 0 | |
| Gilia millefoliata | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | DARK-EYED GILIA | 0 | |
| Githopsis diffusa subsp. robusta | CNPS-EB: A2 | southern bluecup | 4 | |
| Glyceria leptostachya | CNPS-EB: A1 | narrow manna grass, Davy's mannagrass | 1 | |
| Gratiola ebracteata | CNPS-EB: A1 | bractless hedge-hyssop | 2 | |
| Helenium bigelovii | (H. puberulum is more common) | CNPS-EB: A2 | Bigelow's sneezeweed | 12 |
| Helianthella californica var. californica | CNPS-EB: A2 | California helianthella | 8 | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | 85 | |
| Hesperevax acaulis var. ambusticola | (H. sparsiflora is more common | CNPS-EB: A1x | fire evax | 0 |
| Hesperevax caulescens | (H. sparsiflora is more common | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | hogwallow starfish | 6 |
| Hesperocyparis sargentii | (formerly Cupressus s.) | CNPS-EB: A1 | Sargent cypress | 1 |
| Hesperolinon breweri | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Brewer's western flax | 27 | |
| Hesperolinon clevelandii | CNPS-EB: A2 | Cleveland's dwarf flax | 4 | |
| Hesperolinon disjunctum | CNPS-EB: A1 | dwarf flax | 2 | |
| Hesperolinon micranthum | CNPS-EB: A2 | small-flowered dwarf flax | 7 | |
| Hesperolinon tehamense | 3 questionable ID sites. Needs field research | CNPS-EB: *A1? State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Napa western flax | 0 |
| Hesperomecon linearis | (formerly Meconella l.) (hist | CNPS-EB: A1x | narrow-leaved meconella | 0 |
| Heterocodon rariflorum | CNPS-EB: A1 | heterocodon | 3 | |
| Heterotheca oregona var. rudis | CNPS-EB: A1 | Oregon goldenaster | 3 | |
| Heterotheca oregona var. scaberrima | CNPS-EB: A1 | Oregon goldenaster | 4 | |
| Heterotheca sessiliflora var. bolanderioides | CNPS-EB: A1x | golden aster | 0 | |
| Hibiscus lasiocarpos var. occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T3 CNDDB Rank: S3 | rose-mallow | 10 | |
| Hoita orbicularis | (historical-1936) | CNPS-EB: A1x | round-leaved psoralea | 0 |
| Holocarpha macradenia | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | Santa Cruz tarplant | 0 | |
| Holozonia filipes | CNPS-EB: A2 | whitecrown, holozonia | 8 | |
| Hordeum brachyantherum subsp. californicum | (ssp. brachyantherum is more common | CNPS-EB: A1 | California barley | 3 |
| Hordeum jubatum subsp. jubatum | CNPS-EB: A2 | foxtail barley, squirreltail barley | 4 | |
| Horkelia californica var. californica | CNPS-EB: A1 | California horkelia | 2 | |
| Horkelia californica var. elata | CNPS-EB: A2 | tall horkelia | 8 | |
| Horkelia cuneata var. sericea | (historical-1894) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G4T1? CNDDB Rank: S1? | Kellogg's horkelia | 0 |
| Hosackia crassifolia var. crassifolia | CNPS-EB: A2 | broad-leaved lotus | 4 | |
| Hosackia oblongifolia var. oblongifolia | Unclear if it occurs in the East Bay | CNPS-EB: A1? | narrow-leaved lotus | 0 |
| Hosackia stipularis var. stipularis | CNPS-EB: A1 | stipulate lotus | 1 | |
| Hydrocotyle ranunculoides | CNPS-EB: A2 | floating marsh pennywort | 8 | |
| Hydrophyllum occidentale | CNPS-EB: A1 | western waterleaf | 4 | |
| Hypericum scouleri | CNPS-EB: A1x | Scouler's st. john's wort, Scouler's St. John's wort | 0 | |
| Idahoa scapigera | CNPS-EB: A1 | flat-pod | 1 | |
| Iris longipetala | CNPS-EB: *A1 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | coast iris | 2 | |
| Isocoma arguta | (historical-date unknown) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Carquinez goldenbush | 0 |
| Isoetes howellii | CNPS-EB: A1 | Howell's quillwort | 2 | |
| Isolepis carinata | (formerly Scirpus koilolepis) | CNPS-EB: A1 | dwarf club-rush | 2 |
| Juncus articulatus subsp. articulatus | CNPS-EB: A1x | jointed rush | 0 | |
| Juncus bufonius var. occidentalis | (historical-1895) (vars. bufon | CNPS-EB: A1x | western toad rush, toad rush | 0 |
| Juncus dubius | CNPS-EB: A1x | mariposa rush, Mariposa rush | 0 | |
| Juncus ensifolius | Unclear if it occurs in East Bay | CNPS-EB: A1? | dagger rush, swordleaved rush, three-stamened rush | 0 |
| Juncus lescurii | CNPS-EB: A1 | San Francisco rush, salt rush | 3 | |
| Juncus oxymeris | CNPS-EB: A1 | pointed rush | 2 | |
| Juncus phaeocephalus var. unknown | CNPS-EB: A2? | brown-headed rush | 2 | |
| Keckiella breviflora var. breviflora | CNPS-EB: A2 | gaping penstemon | 8 | |
| Kopsiopsis strobilacea | (formerly Boschniakia strobilacea) | CNPS-EB: A1 | California ground-cone | 3 |
| Laennecia coulteri | (formerly Conyza c.) | CNPS-EB: A2 | Coulter's horseweed, Coulter's conyza | 4 |
| Lastarriaea coriacea | CNPS-EB: A2 | leather-spineflower, lastarriaea | 4 | |
| Lasthenia conjugens | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE | Contra Costa goldfields | 4 | |
| Lasthenia ferrisiae | CNPS-EB: *A1 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Ferris' goldfields | 1 | |
| Lasthenia fremontii | CNPS-EB: A1 | Fremont's goldfields | 1 | |
| Lasthenia glabrata subsp. glabrata | CNPS-EB: A2 | yellow-ray goldfields | 8 | |
| Lasthenia maritima | CNPS-EB: A1x | maritime goldfields, seaside goldfields, Farallon weed | 0 | |
| Lasthenia microglossa | CNPS-EB: A2 | small-ray goldfields | 7 | |
| Lasthenia minor | CNPS-EB: A1 | coastal goldfields, woolly goldfields | 1 | |
| Lasthenia platycarpha | CNPS-EB: A1 | alkali goldfields | 1 | |
| Lathyrus jepsonii var. jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | delta tule pea, Delta tule pea | 13 | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | 6 | |
| Layia gaillardioides | CNPS-EB: A2 | woodland layia | 11 | |
| Layia glandulosa | (historical-1983 but not seen | CNPS-EB: A1x | white layia | 0 |
| Leersia oryzoides | CNPS-EB: A1 | rice cutgrass | 2 | |
| Legenere limosa | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 | legenere | 1 | |
| Lepidium oblongum | (historical-1937) | CNPS-EB: A1x | wayside pepper-grass | 0 |
| Lepidium oxycarpum | CNPS-EB: A2 | sharp-podded pepper-grass | 4 | |
| Lepidospartum squamatum | (historical-1933) | CNPS-EB: A1x | California broom-shrub | 0 |
| Leptochloa fusca subsp. fascicularis | CNPS-EB: A2 | bearded sprangletop | 5 | |
| Leptochloa fusca subsp. uninervia | CNPS-EB: A1 | mexican sprangletop, dense-flowered sprangle-top | 3 | |
| Leptosiphon ambiguus | (formerly Linanthus a.) | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | serpentine leptosiphon, serpentine linanthus | 22 |
| Leptosiphon aureus | (formerly L.acicularis, Linanthus acicularis) | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4? CNDDB Rank: S4? | bristly leptosiphon, bristly linanthus | 4 |
| Leptosiphon bolanderi | (formerly Linanthus b.) | CNPS-EB: A1 | Bolander's linanthus, Bolander's leptosiphon | 2 |
| Leptosiphon grandiflorus | (formerly Linanthus g.) | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G3G4 CNDDB Rank: S3S4 | large-flowered leptosiphon, large-flowered linanthus | 0 |
| Leptosiphon liniflorus | (formerly Linanthus l.) | CNPS-EB: A1 | flax-flowered linanthus, flax-flowered leptosiphon | 1 |
| Leptosiphon parviflorus | (formerly Linanthus p.) | CNPS-EB: A2 | small-flowered linanthus, small-flowered leptosiphon | 5 |
| Leptosyne calliopsidea | (formerly Coreopsis c.) | CNPS-EB: A1 | leafy-stemmed coreopsis | 1 |
| Leptosyne hamiltonii | (formerly Coreopsis h.) | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Hamilton coreopsis | 1 |
| Leptosyne stillmanii | (formerly Coreopsis s.) | CNPS-EB: A1x | Stillman's coreopsis | 0 |
| Lessingia hololeuca | (historical-1940) | CNPS-EB: *A1x State CNPS: 3 Global Rank: G2G3 CNDDB Rank: S2S3 | woolly-headed lessingia | 0 |
| Lessingia nana | CNPS-EB: A1x | dwarf lessingia | 0 | |
| Lessingia nemaclada | CNPS-EB: A2 | slender-stemmed lessignia | 5 | |
| Lessingia pectinata var. tenuipes | CNPS-EB: A2 | valley lessingia | 4 | |
| Lessingia ramulosa | CNPS-EB: A1 | 0 | ||
| Lessingia tenuis | CNPS-EB: *A2 State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | spring lessingia | 5 | |
| Lewisia rediviva var. rediviva | CNPS-EB: A2 | bitterroot | 8 | |
| Ligusticum apiifolium | CNPS-EB: A2 | Pacific lovage | 5 | |
| Lilaeopsis masonii | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 CESA Status: CR | Mason's lilaeopsis | 21 | |
| Lilium pardalinum subsp. pardalinum | CNPS-EB: A1 | leopard lily | 2 | |
| Limnanthes douglasii subsp. douglasii | CNPS-EB: A1 | meadowfoam | 3 | |
| Limnanthes douglasii subsp. nivea | CNPS-EB: A1x | meadowfoam | 0 | |
| Limnanthes douglasii subsp. rosea | CNPS-EB: A1x | meadowfoam | 0 | |
| Limosella acaulis | CNPS-EB: A1 | southern mudwort | 2 | |
| Limosella aquatica | CNPS-EB: A1x | northern mudwort | 0 | |
| Linanthus dichotomus subsp. dichotomus | CNPS-EB: A1 | EVENING SNOW | 2 | |
| Linanthus dichotomus subsp. meridianus | CNPS-EB: A1 | 3 | ||
| Linum lewisii var. lewisii | (historical-1936) | CNPS-EB: A1x | western blue flax | 0 |
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | 1 | |
| Lithophragma cymbalaria | (historical-1895) | CNPS-EB: A1x | mission star | 0 |
| Ludwigia palustris | CNPS-EB: A1x | American marsh purslane | 0 | |
| Lupinus affinis | CNPS-EB: A1 | lupine | 1 | |
| Lupinus arboreus | CNPS-EB: A2 | yellow bush lupine | 5 | |
| Lupinus benthamii | (historical-1955) | CNPS-EB: A1x | spider lupine | 0 |
| Lupinus chamissonis | (historical-1963) | CNPS-EB: A1x | Chamisso's bush lupine | 0 |
| Lupinus concinnus | CNPS-EB: A1 | Bajada lupine | 3 | |
| Lupinus littoralis var. variicolor | (formerly L. variicolor) | CNPS-EB: A1? | bluff lupine | 0 |
| Lupinus luteolus | CNPS-EB: A1x | butter lupine | 0 | |
| Lycopus americanus | CNPS-EB: A2 | cutleaf bugleweed | 7 | |
| Lycopus asper | CNPS-EB: A1 | bugleweed | 1 | |
| Lysimachia maritima | CNPS-EB: A1 | sea-milkwort | 2 | |
| Lysimachia minima | (formerly Anagallis minima, Centunculus minimus) | CNPS-EB: A1 | chaffweed | 1 |
| Madia anomala | CNPS-EB: A1x | plump-seeded madia | 0 | |
| Madia radiata | (historical-1941) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G3 CNDDB Rank: S3 | showy golden madia, showy madia | 0 |
| Malacothamnus hallii | (M. fasciculatus in Jepson Man | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Hall's bush-mallow | 8 |
| Malacothrix californica | (historical-1895) | CNPS-EB: A1x | California malacothrix | 0 |
| Malacothrix clevelandii | CNPS-EB: A2 | Cleveland's malacothrix | 8 | |
| Malacothrix coulteri | CNPS-EB: A1 | snake's-head | 1 | |
| Matricaria occidentalis | (formerly Chamomilla o.) (hist | CNPS-EB: A1x | valley mayweed, valley pineapple weed | 0 |
| Meconella californica | CNPS-EB: A1x | California meconella | 0 | |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 | Oregon meconella | 4 | |
| Melica bulbosa | CNPS-EB: A1 | onion grass | 1 | |
| Melica subulata | CNPS-EB: A1 | 2 | ||
| Mentzelia dispersa | CNPS-EB: A2 | Nada stick-leaf | 4 | |
| Mentzelia laevicaulis var. laevicaulis | (historical-1969) | CNPS-EB: A1x | blazing star | 0 |
| Mentzelia micrantha | CNPS-EB: A2 | small-flowered stick-leaf | 5 | |
| Mentzelia pectinata | (historical-1935) | CNPS-EB: A1x | San Joaquin blazing star | 0 |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed | 0 |
| Micropus californicus var. subvestitus | (var. californicus is more common) | CNPS-EB: A2 | slender cottonweed | 4 |
| Microseris acuminata | CNPS-EB: A1 | Sierra Foothills microseris | 3 | |
| Microseris bigelovii | (historical-1891) | CNPS-EB: A1x | coast microseris | 0 |
| Microseris campestris | CNPS-EB: A1 | San Joaquin microseris | 3 | |
| Microseris douglasii subsp. tenella | (subsp douglasii is more common) | CNPS-EB: A2 | silver puffs | 7 |
| Microseris elegans | CNPS-EB: A1 | elegant microseris | 1 | |
| Microseris sylvatica | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | sylvan microseris | 5 | |
| Mirabilis laevis var. crassifolia | (formerly M. californica) | CNPS-EB: A1 | wishbone bush, California four o'clock | 1 |
| Moehringia macrophylla | CNPS-EB: A2 | large-leaved sandwort, big-leaf sandwort | 8 | |
| Monardella breweri subsp. breweri | (historical-1868) | CNPS-EB: A1x | Brewer's monardella | 0 |
| Monardella douglasii | CNPS-EB: A2 | fenestra monardella, Fenestra monardella | 11 | |
| Monolepis nuttalliana | CNPS-EB: A1 | Nuttall's poverty weed, poverty weed | 2 | |
| Monolopia gracilens | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | woodland woollythreads, woodland monolopia | 9 | |
| Monolopia lanceolata | CNPS-EB: A1 | common hillside daisy, common monolopia | 1 | |
| Montia linearis | (historical-1933) | CNPS-EB: A1x | linear-leaved montia | 0 |
| Myosotis laxa | CNPS-EB: A1x | BAY FORGET-ME-NOT | 1 | |
| Myosurus minimus subsp. apus | CNPS-EB: *A1? State CNPS: 3.1 Global Rank: G5T2Q CNDDB Rank: S2 | little mousetail | 0 | |
| Myosurus sessilis | CNPS-EB: A2 | sessile mouse-tail | 6 | |
| Myriopteris gracillima | CNPS-EB: A1 | lace fern | 2 | |
| Navarretia atractyloides | CNPS-EB: A2 | holly-leaved navarretia | 6 | |
| Navarretia cotulifolia | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | cotula navarretia | 4 | |
| Navarretia gowenii | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Lime Ridge navarretia | 5 | |
| Navarretia hamata subsp. parviloba | CNPS-EB: A1 | hooked navarretia | 2 | |
| Navarretia heterandra | CNPS-EB: *A1 State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | Tehama navarretia | 2 | |
| Navarretia intertexta | CNPS-EB: A2 | needle-leaved navarretia | 4 | |
| Navarretia nigelliformis subsp. nigelliformis | CNPS-EB: *A2? State CNPS: 4.2 Global Rank: G4T3 CNDDB Rank: S3 | adobe navarretia | 0 | |
| Navarretia nigelliformis subsp. radians | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G4T2T3 CNDDB Rank: S2S3 | shining navarretia | 3 | |
| Navarretia prostrata | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | prostrate vernal pool navarretia | 3 | |
| Navarretia tagetina | (historical-1927) | CNPS-EB: A1x | marigold navarretia | 0 |
| Navarretia viscidula | CNPS-EB: A2 | sticky navarretia | 4 | |
| Nemacladus capillaris | CNPS-EB: A1 | 1 | ||
| Nicotiana attenuata | CNPS-EB: A1 | coyote tobacco | 1 | |
| Nitrophila occidentalis | CNPS-EB: A1 | nitrophila | 2 | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | 12 | |
| Oenothera deltoides subsp. cognata | CNPS-EB: A1 | desert evening-primrose | 2 | |
| Oenothera deltoides subsp. howellii | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | Antioch Dunes evening-primrose | 5 | |
| Oenothera deltoides subsp. julpunensis | CNPS-EB: A1 | 5 | ||
| Oxalis oregana | CNPS-EB: A1 | redwood sorrel | 1 | |
| Panicum capillare | CNPS-EB: A2 | witch grass | 5 | |
| Parietaria hespera var. californica | CNPS-EB: A1 | California pellitory | 1 | |
| Pectocarya penicillata | CNPS-EB: A2 | northern pectocarya, winged pectocarya | 4 | |
| Pediomelum californicum | CNPS-EB: A2 | indian breadroot | 8 | |
| Penstemon heterophyllus var. purdyi | CNPS-EB: A2 | foothill penstemon | 4 | |
| Pentachaeta exilis subsp. exilis | CNPS-EB: A1 | meager pentachaeta | 3 | |
| Perideridia gairdneri subsp. gairdneri | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G5T3T4 CNDDB Rank: S3S4 | Gairdner's yampah | 0 | |
| Perideridia oregana | CNPS-EB: A2 | yampah | 4 | |
| Persicaria hydropiperoides | (formerly Polygonum h.) | CNPS-EB: A2 | false waterpepper, water-pepper | 7 |
| Petasites frigidus var. palmatus | CNPS-EB: A1 | western sweet coltsfoot, coltsfoot | 1 | |
| Petunia parviflora | CNPS-EB: A1 | wild petunia | 1 | |
| Phacelia douglasii | CNPS-EB: A1 | Douglas' phacelia | 1 | |
| Phacelia egena | (historical-1956) | CNPS-EB: A1x | phacelia | 0 |
| Phacelia malvifolia var. malvifolia | CNPS-EB: A2 | stinging phacelia | 5 | |
| Phacelia phacelioides | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo phacelia | 13 | |
| Phacelia ramosissima | CNPS-EB: A2 | branching phacelia | 7 | |
| Phacelia suaveolens | CNPS-EB: A1 | sweet-scented phacelia | 1 | |
| Phalaris angusta | (historical-1912) | CNPS-EB: A1x | narrow canary grass | 0 |
| Phalaris arundinacea | CNPS-EB: A1 | reed canary grass | 2 | |
| Phalaris californica | (historical-1943) | CNPS-EB: A1x | California canary grass | 0 |
| Phalaris lemmonii | CNPS-EB: A1 | Lemmon's canary-grass | 1 | |
| Phyla lanceolata | CNPS-EB: A1x | fog-fruit | 0 | |
| Pilularia americana | CNPS-EB: A1 | pillwort | 4 | |
| Pinus attenuata | CNPS-EB: A1 | knobcone pine | 4 | |
| Piperia michaelii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Michael's rein-orchid | 16 | |
| Piperia unalascensis | CNPS-EB: A1 | Alaska piperia, slender-spire orchid | 2 | |
| Plagiobothrys chorisianus var. chorisianus | (historical-1890) | CNPS-EB: *A1x State CNPS: 1B.2 Global Rank: G3T1Q CNDDB Rank: S1 | Choris' popcornflower | 0 |
| Plagiobothrys diffusus | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G1Q CNDDB Rank: S1 CESA Status: CE | San Francisco popcornflower | 0 | |
| Plagiobothrys glaber | CNPS-EB: *A1 State CNPS: 1A Global Rank: GX CNDDB Rank: SX | hairless popcornflower | 1 | |
| Plagiobothrys humistratus | CNPS-EB: A2 | low popcornflower, dwarf allocarya | 9 | |
| Plagiobothrys infectivus | CNPS-EB: A1x | dye popcornflower | 0 | |
| Plagiobothrys leptocladus | CNPS-EB: A1 | alkali plagiobothrys | 2 | |
| Plagiobothrys undulatus | CNPS-EB: A2 | wavy-stemmed popcornflower, coast allocarya | 4 | |
| Plantago maritima | CNPS-EB: A1 | Pacific seaside plantain | 1 | |
| Plantago subnuda | CNPS-EB: A2 | Mexican plantain | 7 | |
| Platanthera dilatata var. leucostachys | (formerly P. l.) (historical-1 | CNPS-EB: A1x | white-flowered bog-orchid | 0 |
| Plectritis congesta subsp. congesta | CNPS-EB: A1x | sea blush | 0 | |
| Poa douglasii | (historical-1882) | CNPS-EB: A1x | sanddune bluegrass | 0 |
| Poa howellii | CNPS-EB: A2 | Howell's bluegrass | 6 | |
| Pogogyne douglasii | (historical-1940) | CNPS-EB: A1x | Douglas' beardstyle, Douglas pogogyne | 0 |
| Pogogyne zizyphoroides | CNPS-EB: A2 | Sacramento beardstyle | 5 | |
| Polemonium carneum | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G3G4 CNDDB Rank: S2 | Oregon polemonium, great polemonium | 0 | |
| Polygonum marinense | CNPS-EB: *A1x State CNPS: 3.1 Global Rank: G2Q CNDDB Rank: S2 | MARIN KNOTWEED | 0 | |
| Polypodium scouleri | CNPS-EB: A1 | leather-leaf fern | 3 | |
| Polystichum californicum | CNPS-EB: A1 | California sword fern | 1 | |
| Polystichum imbricans subsp. imbricans | CNPS-EB: A1x | rock sword fern | 0 | |
| Potamogeton zosteriformis | (historical-1949) | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G5 CNDDB Rank: S3 | eel-grass pondweed | 0 |
| Potentilla anserina subsp. pacifica | CNPS-EB: A2 | Pacific silverweed | 7 | |
| Primula clevelandii var. gracilis | (ssp. patulum is more common) | CNPS-EB: A1x | Padre's shooting star | 0 |
| Prosartes smithii | (formerly Disporum s.)(P. | CNPS-EB: A1x | large-flowered fairy bell | 0 |
| Pseudognaphalium biolettii | (formerly Gnaphalium bicolor) | CNPS-EB: A1 | Bioletti's cudweed | 3 |
| Pseudognaphalium microcephalum | (formerly Gnaphalium canescens | CNPS-EB: A1 | white everlasting | 3 |
| Psilocarphus brevissimus var. multiflorus | May not occur in EastBay (var. brevissimus is more common | CNPS-EB: *A1? State CNPS: 4.2 Global Rank: G4T3 CNDDB Rank: S3 | delta woolly-marbles | 0 |
| Psilocarphus chilensis | (formerly P. tenellus var. glo | CNPS-EB: A1 | round woolly marbles, round woolly-marbles | 1 |
| Psilocarphus oregonus | CNPS-EB: A2 | Oregon woollyheads, Oregon woolly-marbles | 6 | |
| Puccinellia nutkaensis | CNPS-EB: A1x | Alaska alkali grass | 0 | |
| Puccinellia nuttalliana | CNPS-EB: A1 | Nuttall's alkali grass | 2 | |
| Puccinellia simplex | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | little alkali grass | 7 | |
| Pyrrocoma racemosa var. racemosa | CNPS-EB: A1 | racemose pyrrocoma | 1 | |
| Quercus palmeri | CNPS-EB: A2 | Palmer's oak | 4 | |
| Quercus parvula var. shrevei | CNPS-EB: A1 | island scrub oak | 3 | |
| Ranunculus lobbii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S3 | Lobb's aquatic buttercup | 6 | |
| Ranunculus orthorhynchus var. bloomeri | CNPS-EB: A1x | Bloomer's buttercup | 0 | |
| Ranunculus orthorhynchus var. orthorhynchus | (historical-1895) | CNPS-EB: A1x | straight-beaked buttercup | 0 |
| Rhinotropis californica | (formerly Polygala californica) | CNPS-EB: A2 | California milkwort | 4 |
| Ribes amarum | CNPS-EB: A1? | bitter gooseberry | 0 | |
| Ribes aureum var. gracillimum | CNPS-EB: A2 | golden currant | 6 | |
| Ribes quercetorum | CNPS-EB: A2 | oakwoods gooseberry, oak gooseberry | 6 | |
| Ribes speciosum | CNPS-EB: A1 | fuchsia-flowered gooseberry | 1 | |
| Romanzoffia californica | CNPS-EB: A1 | Suksdorf's romanzoffia | 1 | |
| Rubus spectabilis | CNPS-EB: A1x | salmonberry | 0 | |
| Rumex crassus | (formerly R. salicifolius var. crassus | CNPS-EB: A2 | willow dock | 5 |
| Rumex fueginus | CNPS-EB: A2 | golden dock | 5 | |
| Rumex occidentalis | CNPS-EB: A2 | western dock | 4 | |
| Rumex salicifolius var. unknown | CNPS-EB: A2? | willow dock | 0 | |
| Sabulina californica | (formerly Minuartia californica) | CNPS-EB: A1 | California sandwort | 1 |
| Sabulina pusilla | (formerly Minuartia pusilla) | CNPS-EB: A1 | annual sandwort, least sandwort | 1 |
| Sagittaria latifolia | CNPS-EB: A1x | arrowhead | 0 | |
| Sagittaria montevidensis subsp. calycina | CNPS-EB: A1 | 1 | ||
| Salix breweri | CNPS-EB: A1x | Brewer's willow | 0 | |
| Salix melanopsis | CNPS-EB: A1x | dusky willow | 0 | |
| Salix scouleriana | CNPS-EB: A2 | Scouler's willow | 4 | |
| Salvia carduacea | (historical-1946) | CNPS-EB: A1x | thistle sage | 0 |
| Salvia spathacea | CNPS-EB: A1 | California hummingbird sage, hummingbird sage | 1 | |
| Samolus parviflorus | CNPS-EB: A1 | seaside brookweed, water-pimpernel | 3 | |
| Sanicula arctopoides | CNPS-EB: A1x | footsteps of spring, yellow mats | 0 | |
| Sanicula laciniata | CNPS-EB: A2 | coast sanicle | 7 | |
| Sanicula maritima | (historical-1936) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 CESA Status: CR | adobe sanicle | 0 |
| Sanicula saxatilis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 CESA Status: CR | rock sanicle | 9 | |
| Schoenoplectus tabernaemontani | CNPS-EB: A1x | SOFT-STEM BULRUSH | 0 | |
| Scoliopus bigelovii | (historical-1900) | CNPS-EB: A1x | fetid adder's tongue, slink pod | 0 |
| Scutellaria galericulata | (historical-1949) | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G5 CNDDB Rank: S2 | marsh skullcap | 0 |
| Scutellaria siphocampyloides | CNPS-EB: A2 | gray-leaved skullcap | 6 | |
| Sedella pentandra | (formorely Parvisedum pentandr | CNPS-EB: A1 | Mount Hamilton sedella | 2 |
| Sedum radiatum subsp. radiatum | (formerly S. radiatum) | CNPS-EB: A2 | coast range stonecrop, star-fruited stonecrop | 4 |
| Senecio aphanactis | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G3 CNDDB Rank: S2 | chaparral ragwort, rayless ragwort | 0 | |
| Senecio flaccidus var. douglasii | CNPS-EB: A2 | Douglas' threadleaf ragwort, shrubby butterweed | 14 | |
| Senecio hydrophilus | CNPS-EB: A2 | water ragwort, alkali-marsh ragwort, alkali-marsh butterweed | 5 | |
| Sidalcea diploscypha | CNPS-EB: A2 | fringed checkerbloom, fringed sidalcea | 4 | |
| Silene antirrhina | CNPS-EB: A1 | sleepy catchfly, snapdragon catchfly | 2 | |
| Silene lemmonii | CNPS-EB: A1 | LEMMON'S CATCHFLY | 1 | |
| Silene verecunda | CNPS-EB: A1 | San Francisco campion, Cuyamaca campion | 3 | |
| Sisyrinchium californicum | CNPS-EB: A1 | golden-eyed-grass | 3 | |
| Sium suave | CNPS-EB: A1 | hemlock water-parsnip | 2 | |
| Sparganium eurycarpum var. eurycarpum | CNPS-EB: A1 | bur-reed | 2 | |
| Sparganium eurycarpum var. greenei | CNPS-EB: A1 | Greene's bur-reed | 1 | |
| Spergularia macrotheca var. leucantha | CNPS-EB: A1 | large-flowered sand spurry | 4 | |
| Spergularia macrotheca var. longistyla | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | large-flowered sand spurry | 9 | |
| Spergularia macrotheca var. macrotheca | CNPS-EB: A2 | large-flowered sand spurry | 6 | |
| Spergularia macrotheca var. unknown | CNPS-EB: A2? | large-flowered sand spurry | 1 | |
| Spiranthes porrifolia | CNPS-EB: A1x | western ladies' tresses | 0 | |
| Spiranthes romanzoffiana | CNPS-EB: A1 | hooded ladies' tresses | 1 | |
| Sporobolus airoides | CNPS-EB: A1 | alkali sacaton | 2 | |
| Stachys ajugoides | (var. rigida is more common) | CNPS-EB: A2 | bugle hedge nettle | 4 |
| Stachys bullata | CNPS-EB: A1? | California hedge nettle | 0 | |
| Stephanomeria elata | CNPS-EB: A1 | stephanomeria | 2 | |
| Stipa lemmonii var. lemmonii | (formerly Achnatherum lemmonii) | CNPS-EB: A2 | Lemmon needlegrass | 6 |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | most beautiful jewel-flower | 24 | |
| Streptanthus breweri | CNPS-EB: A1 | Brewer's streptanthus | 3 | |
| Streptanthus hispidus | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo jewelflower | 11 | |
| Stuckenia filiformis subsp. alpina | (formerly Potamogeton f.) | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G5T5 CNDDB Rank: S2S3 | slender-leaved potamogeton | 0 |
| Suaeda californica | (historical-1958) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE | California seablite | 0 |
| Symphyotrichum frondosum | (historical-1958) | CNPS-EB: A1x | short-rayed alkali aster | 0 |
| Symphyotrichum lanceolatum var. hesperium | (formerly Aster lanceolatus ss | CNPS-EB: A2 | marsh aster | 7 |
| Symphyotrichum lentum | (formerly Aster lentus) | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Suisun marsh aster | 23 |
| Taxus brevifolia | CNPS-EB: A1 | PACIFIC YEW | 1 | |
| Thermopsis californica var. californica | (historical-1929) | CNPS-EB: A1x | santa ynez false-lupine, false-lupine | 0 |
| Thysanocarpus radians | CNPS-EB: A1 | ribbed fringe pod | 3 | |
| Tolmiea diplomenziesii | CNPS-EB: A1x | pig-a-back plant | 0 | |
| Torreyochloa pallida var. pauciflora | CNPS-EB: A1x | weak manna grass | 0 | |
| Toxicoscordion paniculatum | May not occur in East Bay (formerly Zigadenus paniculatum) | CNPS-EB: A1? | panicled zygadene | 0 |
| Toxicoscordion venenosum var. venenosum | (formerly Zigadenus venenosus) | CNPS-EB: A1 | death-camas | 4 |
| Trianthema portulacastrum | CNPS-EB: A1x | horse purslane | 0 | |
| Trifolium barbigerum | CNPS-EB: A2 | bearded clover | 9 | |
| Trifolium cyathiferum | CNPS-EB: A1 | BOWL CLOVER | 3 | |
| Trifolium grayi | CNPS-EB: A2 | Gray's clover | 4 | |
| Trifolium hydrophilum | (vars. amplectens and truncatu | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | saline clover | 4 |
| Trifolium macraei | CNPS-EB: A1 | Macrae's clover, double-headed clover | 2 | |
| Trifolium wormskioldii | CNPS-EB: A1 | cow clover | 2 | |
| Triglochin concinna var. concinna | (T. maritima is more common) | CNPS-EB: A1 | seaside arrow-grass, slender arrow-grass | 3 |
| Trillium ovatum subsp. ovatum | CNPS-EB: A2 | white trillium | 11 | |
| Triodanis biflora | CNPS-EB: A2 | Venus' looking-glass | 6 | |
| Trisetum canescens | CNPS-EB: A2 | tall trisetum | 4 | |
| Triteleia peduncularis | CNPS-EB: A1 | long-rayed brodiaea | 2 | |
| Tropidocarpum capparideum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | caper-fruited tropidocarpum | 2 | |
| Vancouveria planipetala | (historical-1898) | CNPS-EB: A1x | redwood ivy, inside-out flower | 0 |
| Verbena hastata | CNPS-EB: A1 | blue vervain | 1 | |
| Viburnum ellipticum | CNPS-EB: *A2 State CNPS: 2B.3 Global Rank: G4G5 CNDDB Rank: S3 | oval-leaved viburnum | 4 | |
| Vicia hassei | CNPS-EB: A2 | slender vetch | 7 | |
| Viola adunca subsp. adunca | CNPS-EB: A1 | western blue violet | 2 | |
| Viola douglasii | CNPS-EB: A2 | Douglas' violet, golden violet | 4 | |
| Viola glabella | CNPS-EB: A2 | stream violet, smooth yellow violet | 5 | |
| Viola purpurea subsp. purpurea | CNPS-EB: A1 | mountain violet | 1 | |
| Viola sempervirens | CNPS-EB: A2 | evergreen violet, redwood violet | 7 | |
| Viola sheltonii | CNPS-EB: A2 | Shelton's violet, fan violet | 6 | |
| Wolffia brasiliensis | CNPS-EB: *A1 State CNPS: 2B.3 Global Rank: G5 CNDDB Rank: S2 | BRAZILIAN WATERMEAL | 1 | |
| Zeltnera trichantha | (formerly Centaurium tricanthu | CNPS-EB: A1x | alkali centaury | 0 |