| Scientific Name | Notes | Rarity Ranks | Common Name | Num Pops |
|---|---|---|---|---|
| Acanthomintha lanceolata | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | Santa Clara thornmint | 11 | |
| 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 | 9 | |
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | 7 | |
| Allium acuminatum | CNPS-EB: A1 | Hooker's onion | 4 | |
| Allium amplectens | CNPS-EB: A2 | narrow-leaved onion | 4 | |
| Allium bolanderi var. bolanderi | CNPS-EB: A1 | Bolander's onion | 3 | |
| Allium crispum | CNPS-EB: A1 | crinkled onion | 1 | |
| Allium falcifolium | CNPS-EB: A2 | sickle-leaved onion | 8 | |
| Allium sharsmithiae | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Sharsmith's onion | 9 | |
| Allophyllum gilioides subsp. gilioides | CNPS-EB: A2 | straggling gilia | 9 | |
| Alnus rubra | (A. rhombifolia is more common | CNPS-EB: A2 | red alder | 4 |
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | 2 | |
| Ammannia coccinea | CNPS-EB: A1 | long-leaved ammannia | 1 | |
| Amsinckia eastwoodiae | CNPS-EB: A2 | 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 | 29 | |
| Amsinckia tessellata var. gloriosa | CNPS-EB: A1 | carrizo fiddleneck, tessellate fiddleneck | 1 | |
| Amsinckia tessellata var. tessellata | CNPS-EB: A1 | desert fiddleneck, devil's lettuce | 2 | |
| 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 | 11 | |
| 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: A2 | 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 |
| 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 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 | 3 | |
| 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 | |
| Artemisia dracunculus | CNPS-EB: A2 | tarragon | 4 | |
| Arthrocnemum subterminale | CNPS-EB: A2 | Parish's glasswort | 5 | |
| Asclepias cordifolia | (A. californica is more common | CNPS-EB: A1 | purple milkweed | 3 |
| Aspidotis californica | CNPS-EB: A2 | California lace fern | 5 | |
| Astragalus didymocarpus var. didymocarpus | (A. gambelianus is more common | CNPS-EB: A1 | two-seeded milkvetch | 2 |
| 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 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 | 3 | |
| 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 | |
| Bromus sitchensis var. maritimus | (formerly B. maritimus) | CNPS-EB: A1 | maritime brome, seaside brome grass | 1 |
| 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 pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | 36 | |
| 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 | 9 | |
| Camissonia strigulosa | CNPS-EB: A1 | contorted primrose | 3 | |
| Camissoniopsis cheiranthifolia subsp. cheiranthifolia | CNPS-EB: A1 | dune suncup | 1 | |
| Campanula exigua | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | chaparral harebell | 9 | |
| Campanula griffinii | CNPS-EB: A1 | Griffin's campanula | 4 | |
| Carex aquatilis var. dives | CNPS-EB: A1 | Sitka sedge | 1 | |
| Carex brevicaulis | CNPS-EB: A2 | short-stemmed sedge | 6 | |
| 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: G4T4 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 | 2 | |
| Caulanthus flavescens | CNPS-EB: A2 | yellow-flowered thelypodium | 4 | |
| 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 | 16 |
| Cephalanthus occidentalis | CNPS-EB: A2 | button bush | 5 | |
| 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 pratericola | CNPS-EB: A1 | 3 | ||
| Chenopodium rubrum | CNPS-EB: A1 | red pigweed, red goosefoot | 2 | |
| Chlorogalum pomeridianum var. minus | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G5T3 CNDDB Rank: S3 | DWARF SOAPROOT | 1 | |
| 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 polygonoides var. polygonoides | CNPS-EB: A1 | knotweed spineflower | 2 | |
| Chrysolepis chrysophylla var. minor | CNPS-EB: A2 | golden chinquapin | 5 | |
| Cicendia quadrangularis | CNPS-EB: A2 | timwort | 6 | |
| 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 | 1 | |
| Cirsium douglasii var. douglasii | CNPS-EB: A1 | swamp thistle | 2 | |
| 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 quercetorum | CNPS-EB: A2 | brownie thistle | 6 | |
| Cirsium remotifolium var. odontolepis | CNPS-EB: A1 | remote-leaved thistle | 1 | |
| Clarkia biloba subsp. biloba | CNPS-EB: A2 | lobed godetia | 11 | |
| 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. viminea | (ssp. quadrivulnera more common | CNPS-EB: A1 | large godetia | 1 |
| Clarkia rhomboidea | CNPS-EB: A1 | 4 | ||
| Clarkia tembloriensis subsp. tembloriensis | CNPS-EB: A1 | temblor clarkia | 2 | |
| Clintonia andrewsiana | CNPS-EB: A1 | red clintonia | 2 | |
| 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 |
| 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: A1 | stiffly-branched bird's-beak | 2 | |
| Cornus glabrata | CNPS-EB: A1 | brown dogwood | 2 | |
| Crocidium multicaule | CNPS-EB: A1 | spring gold | 3 | |
| Croton californicus | CNPS-EB: A2 | California croton | 5 | |
| Cryptantha corollata | formerly C. decipiens. Also includes previous records for C. rattanii | CNPS-EB: A2 | COAST RANGE CRYPTANTHA | 6 |
| Cryptantha juniperensis | (formerly C. nevadensis var. rigida) | CNPS-EB: A1 | Nevada cryptantha | 4 |
| Cryptantha micromeres | CNPS-EB: A2 | minute-flowered cryptantha | 4 | |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | 9 | |
| Cucurbita foetidissima | CNPS-EB: A1 | buffalo gourd, calabazilla, calabazilla | 2 | |
| Cuscuta californica var. californica | CNPS-EB: A2 | California dodder | 4 | |
| Cuscuta campestris | CNPS-EB: A1 | field dodder | 2 | |
| Cuscuta salina | CNPS-EB: A1 | SALT DODDER | ||
| Cyperus niger | CNPS-EB: A2 | black sedge | 6 | |
| 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 | 6 | |
| Dendromecon rigida | CNPS-EB: A2 | bush poppy | 6 | |
| Dicentra formosa | CNPS-EB: A2 | Pacific bleeding heart, bleeding heart | 7 | |
| 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 rattanii | (formerly Mimulus rattanii) | CNPS-EB: A2 | Rattan monkeyflower | 4 |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | 53 | |
| Downingia cuspidata | CNPS-EB: A1 | cuspidate downingia | 1 | |
| Downingia insignis | CNPS-EB: A1 | cupped downingia | 3 | |
| 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 | |
| Echinodorus berteroi | CNPS-EB: A2 | burhead | 6 | |
| Eclipta prostrata | CNPS-EB: A1 | false daisy | 3 | |
| Elatine brachysperma | CNPS-EB: A1 | waterwort | 1 | |
| Elatine californica | CNPS-EB: A2 | 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 | |
| Elymus trachycaulus subsp. trachycaulus | CNPS-EB: A1 | slender wheat grass | 2 | |
| Enemion occidentale | (formerly Isopyrum o.) | CNPS-EB: A2 | western rue-anemone | 9 |
| Enemion stipitatum | (formerly Isopyrum s.) | CNPS-EB: A2 | Siskiyou rue-anemone | 5 |
| 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: A1 | narrow-leaved boisduvalia | 3 | |
| Epipactis gigantea | CNPS-EB: A1 | stream orchid | 1 | |
| Equisetum laevigatum | CNPS-EB: A2 | smooth scouring rush | 4 | |
| Eragrostis hypnoides | CNPS-EB: A2 | 4 | ||
| 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: CC | 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 | 6 | |
| 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 roseum | CNPS-EB: A2 | wand wild buckwheat, virgate buckwheat | 6 | |
| 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. hooveri | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 | Hoover's button-celery | 2 | |
| 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 | 17 | ||
| Eryngium spinosepalum | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | 1 | ||
| Eryngium vaseyi var. vallicola | CNPS-EB: A1 | coyote-thistle, Vasey's coyote-thistle | 2 | |
| 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 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 nasuta | CNPS-EB: A2 | shy monkeyflower | 8 | |
| 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 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 | 3 | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | 7 | |
| 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 | 28 | |
| 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 flavescens | CNPS-EB: A2 | silk tassel bush | 5 | |
| Gaultheria shallon | CNPS-EB: A1 | salal | 1 | |
| Gilia capitata subsp. capitata | CNPS-EB: A1 | blue field gilia | 3 | |
| 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 | 11 |
| 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 | 82 | |
| 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: A1 | Cleveland's dwarf flax | 3 | |
| Hesperolinon disjunctum | CNPS-EB: A1 | dwarf flax | 2 | |
| Hesperolinon micranthum | CNPS-EB: A2 | small-flowered dwarf flax | 8 | |
| Heterocodon rariflorum | CNPS-EB: A1 | heterocodon | 1 | |
| Heterotheca oregona var. rudis | CNPS-EB: A1 | Oregon goldenaster | 3 | |
| Heterotheca oregona var. scaberrima | CNPS-EB: A1 | Oregon goldenaster | 2 | |
| Hibiscus lasiocarpos var. occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T3 CNDDB Rank: S3 | rose-mallow | 10 | |
| 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 | 6 | |
| Hordeum brachyantherum subsp. californicum | (ssp. brachyantherum is more common | CNPS-EB: A2 | 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 | |
| Hosackia crassifolia var. crassifolia | CNPS-EB: A2 | broad-leaved lotus | 4 | |
| Hosackia stipularis var. stipularis | CNPS-EB: A1 | stipulate lotus | 1 | |
| Hydrocotyle ranunculoides | CNPS-EB: A2 | floating marsh pennywort | 7 | |
| Hydrophyllum occidentale | CNPS-EB: A1 | western waterleaf | 4 | |
| 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 | |
| Isoetes howellii | CNPS-EB: A1 | Howell's quillwort | 2 | |
| Isolepis carinata | (formerly Scirpus koilolepis) | CNPS-EB: A1 | dwarf club-rush | 2 |
| Juncus lescurii | CNPS-EB: A1 | San Francisco rush, salt rush | 3 | |
| Juncus oxymeris | CNPS-EB: A1 | pointed 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: A1 | Coulter's horseweed, Coulter's conyza | 3 |
| 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 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 | |
| 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 oxycarpum | CNPS-EB: A2 | sharp-podded pepper-grass | 4 | |
| Leptochloa fusca subsp. fascicularis | CNPS-EB: A1 | bearded sprangletop | 2 | |
| 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 | 21 |
| Leptosiphon aureus | (formerly L.acicularis, Linanthus acicularis) | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4? CNDDB Rank: S4? | bristly leptosiphon, bristly linanthus | 5 |
| Leptosiphon bolanderi | (formerly Linanthus b.) | CNPS-EB: A1 | Bolander's linanthus, Bolander's leptosiphon | 3 |
| Leptosiphon liniflorus | (formerly Linanthus l.) | CNPS-EB: A1 | flax-flowered linanthus, flax-flowered leptosiphon | 1 |
| 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 |
| Lessingia nemaclada | CNPS-EB: A2 | slender-stemmed lessignia | 6 | |
| 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 | |
| Limosella acaulis | CNPS-EB: A2 | southern mudwort | 2 | |
| Linanthus dichotomus subsp. meridianus | CNPS-EB: A1 | 3 | ||
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | 1 | |
| Lupinus affinis | CNPS-EB: A1 | lupine | 1 | |
| Lupinus arboreus | CNPS-EB: A2 | yellow bush lupine | 4 | |
| Lupinus concinnus | CNPS-EB: A1 | Bajada lupine | 3 | |
| 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 |
| 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 clevelandii | CNPS-EB: A2 | Cleveland's malacothrix | 8 | |
| Malacothrix coulteri | CNPS-EB: A1 | snake's-head | 1 | |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2G3 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 micrantha | CNPS-EB: A2 | small-flowered stick-leaf | 5 | |
| 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 campestris | CNPS-EB: A1 | San Joaquin microseris | 3 | |
| Microseris douglasii subsp. tenella | (subsp douglasii is more common) | CNPS-EB: A2 | silver puffs | 6 |
| Microseris elegans | CNPS-EB: A1 | elegant microseris | 0 | |
| 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 | 6 | |
| Monardella douglasii | CNPS-EB: A2 | fenestra monardella, Fenestra monardella | 10 | |
| 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 | |
| Myosurus minimus subsp. apus | CNPS-EB: *A1 State CNPS: 3.1 Global Rank: G5T2Q CNDDB Rank: S2 | little mousetail | 1 | |
| Myosurus sessilis | CNPS-EB: A1 | sessile mouse-tail | 3 | |
| 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. radians | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G4T2 CNDDB Rank: S2 | shining navarretia | 3 | |
| Navarretia prostrata | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | prostrate vernal pool navarretia | 3 | |
| Navarretia viscidula | CNPS-EB: A2 | sticky navarretia | 4 | |
| Nicotiana attenuata | CNPS-EB: A1 | coyote tobacco | 1 | |
| Nitrophila occidentalis | CNPS-EB: A1 | nitrophila | 2 | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | 11 | |
| Oenothera deltoides subsp. cognata | CNPS-EB: A2 | desert evening-primrose | 3 | |
| 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 | |
| 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 | 6 | |
| Penstemon heterophyllus var. purdyi | CNPS-EB: A2 | foothill penstemon | 4 | |
| Pentachaeta exilis subsp. exilis | CNPS-EB: A1 | meager pentachaeta | 2 | |
| 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 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 suaveolens | CNPS-EB: A1 | sweet-scented phacelia | 1 | |
| Phalaris arundinacea | CNPS-EB: A1 | reed canary grass | 2 | |
| Pilularia americana | CNPS-EB: A1 | pillwort | 2 | |
| Pinus attenuata | CNPS-EB: A1 | knobcone pine | 3 | |
| Piperia michaelii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Michael's rein-orchid | 13 | |
| Piperia unalascensis | CNPS-EB: A1 | Alaska piperia, slender-spire orchid | 1 | |
| 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 leptocladus | CNPS-EB: A1 | alkali plagiobothrys | 2 | |
| Plagiobothrys undulatus | CNPS-EB: A2 | wavy-stemmed popcornflower, coast allocarya | 4 | |
| Plantago subnuda | CNPS-EB: A2 | Mexican plantain | 7 | |
| Poa howellii | CNPS-EB: A2 | Howell's bluegrass | 5 | |
| Pogogyne zizyphoroides | CNPS-EB: A2 | Sacramento beardstyle | 5 | |
| Polypodium scouleri | CNPS-EB: A1 | leather-leaf fern | 3 | |
| Polystichum californicum | CNPS-EB: A1 | California sword fern | 1 | |
| Potentilla anserina subsp. pacifica | CNPS-EB: A2 | Pacific silverweed | 7 | |
| Pseudognaphalium biolettii | (formerly Gnaphalium bicolor) | CNPS-EB: A1 | Bioletti's cudweed | 2 |
| Pseudognaphalium microcephalum | (formerly Gnaphalium canescens | CNPS-EB: A1 | white everlasting | 3 |
| Psilocarphus chilensis | (formerly P. tenellus var. glo | CNPS-EB: A1 | round woolly marbles, round woolly-marbles | 2 |
| Psilocarphus oregonus | CNPS-EB: A2 | Oregon woollyheads, Oregon woolly-marbles | 5 | |
| Puccinellia nuttalliana | CNPS-EB: A1 | Nuttall's alkali grass | 1 | |
| 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 agrifolia x wislizeni | CNPS-EB: A1 | coast live oak x interior live oak | 1 | |
| Quercus garryana x durata | CNPS-EB: A1 | Oregon oak x leather oak | 1 | |
| Quercus palmeri | CNPS-EB: A2 | Palmer's oak | 4 | |
| Quercus parvula var. shrevei | CNPS-EB: A1 | island scrub oak | 3 | |
| Quercus xeplingii | CNPS-EB: A1 | Oregon oak x blue oak | 1 | |
| Ranunculus lobbii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S3 | Lobb's aquatic buttercup | 6 | |
| Rhinotropis californica | (formerly Polygala californica) | CNPS-EB: A1 | California milkwort | 3 |
| 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 | |
| Rumex crassus | (formerly R. salicifolius var. | CNPS-EB: A1 | willow dock | 4 |
| Rumex fueginus | CNPS-EB: A2 | golden dock | 5 | |
| Rumex occidentalis | CNPS-EB: A2 | western dock | 4 | |
| 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: A1 | arrowhead | 1 | |
| Salix scouleriana | CNPS-EB: A2 | Scouler's willow | 4 | |
| Salvia spathacea | CNPS-EB: A1 | California hummingbird sage, hummingbird sage | 1 | |
| Samolus parviflorus | CNPS-EB: A1 | seaside brookweed, water-pimpernel | 3 | |
| Sanicula laciniata | CNPS-EB: A2 | coast sanicle | 6 | |
| Sanicula saxatilis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 CESA Status: CR | rock sanicle | 9 | |
| Scutellaria siphocampyloides | CNPS-EB: A1 | gray-leaved skullcap | 3 | |
| 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 flaccidus var. douglasii | CNPS-EB: A2 | Douglas' threadleaf ragwort, shrubby butterweed | 14 | |
| Senecio hydrophilus | CNPS-EB: A1 | water ragwort, alkali-marsh ragwort, alkali-marsh butterweed | 3 | |
| Sidalcea diploscypha | CNPS-EB: A1 | fringed checkerbloom, fringed sidalcea | 3 | |
| 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: A2 | 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 | |
| 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 | 3 |
| Stephanomeria elata | CNPS-EB: A2 | stephanomeria | 2 | |
| Stipa lemmonii var. lemmonii | (formerly Achnatherum lemmonii) | CNPS-EB: A2 | Lemmon needlegrass | 5 |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | most beautiful jewel-flower | 23 | |
| Streptanthus breweri | CNPS-EB: A1 | Brewer's streptanthus | 2 | |
| Streptanthus hispidus | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo jewelflower | 11 | |
| Symphyotrichum lanceolatum var. hesperium | (formerly Aster lanceolatus ss | CNPS-EB: A2 | marsh aster | 3 |
| 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 | |
| Thysanocarpus radians | CNPS-EB: A1 | ribbed fringe pod | 3 | |
| Toxicoscordion venenosum var. venenosum | (formerly Zigadenus venenosus) | CNPS-EB: A1 | death-camas | 4 |
| Trifolium barbigerum | CNPS-EB: A2 | bearded clover | 6 | |
| Trifolium cyathiferum | CNPS-EB: A1 | BOWL CLOVER | 2 | |
| Trifolium flavulum | (Included within T. fucatum in | CNPS-EB: A1 | bull clover | 1 |
| Trifolium gambelii | (Included within T. fucatum in | CNPS-EB: A1 | bull clover | 1 |
| Trifolium grayi | CNPS-EB: A1 | Gray's clover | 3 | |
| Trifolium hydrophilum | (vars. amplectens and truncatu | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | saline clover | 4 |
| Trifolium lilacinum | (Included within T. barbigerum | CNPS-EB: A1 | Gray's clover | 2 |
| 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 | |
| Tropidocarpum capparideum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | caper-fruited tropidocarpum | 2 | |
| 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 |