| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Acaena californica | (formerly A. pinnatifida var. californica) | CNPS-EB: C | California acaena |
| Agoseris heterophylla var. heterophylla | CNPS-EB: C | ||
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | |
| Alnus rubra | (A. rhombifolia is more common | CNPS-EB: A2 | red alder |
| Amelanchier utahensis | CNPS-EB: C | Utah service-berry | |
| Amsinckia lunaris | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | bent-flowered fiddleneck | |
| Apocynum androsaemifolium | CNPS-EB: A2 | bitter dogbane, dogbane | |
| Aralia californica | CNPS-EB: C | elk clover | |
| Arbutus menziesii | CNPS-EB: B | Pacific madrone | |
| Arctostaphylos glandulosa subsp. glandulosa | CNPS-EB: B | Eastwood manzanita | |
| Arctostaphylos manzanita subsp. manzanita | CNPS-EB: A2 | common manzanita | |
| Asarum caudatum | CNPS-EB: B | wild-ginger | |
| Asclepias speciosa | (A. californica is more common | CNPS-EB: B | showy milkweed, milkweed |
| Berberis nervosa | (B. pinnata is more common) | CNPS-EB: A1 | Oregon grape |
| Berula erecta | CNPS-EB: C | cutleaf water-parsnip | |
| Calamagrostis rubescens | CNPS-EB: B | pine reed grass, pine grass | |
| Calochortus umbellatus | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3? CNDDB Rank: S3? | Oakland star-tulip | |
| Camissoniopsis micrantha | CNPS-EB: C | small primrose | |
| Carex barbarae | CNPS-EB: C | whiteroot sedge, Santa Barbara sedge, St. Barbara's sedge | |
| Carex densa | CNPS-EB: B | dense sedge | |
| Carex harfordii | CNPS-EB: B | Harford's sedge, Monterey sedge | |
| Carex laeviculmis | CNPS-EB: A1 | smooth-stemmed sedge | |
| Carex lenticularis var. lipocarpa | CNPS-EB: A1 | few-ribbed sedge | |
| Carex pellita | (formerly C. lanuginosa) | CNPS-EB: A1 | woolly sedge |
| Carex praegracilis | CNPS-EB: C | black creeper sedge, freeway sedge, deer-bed sedge | |
| Carex senta | CNPS-EB: A1 | western rough sedge, rough sedge | |
| Carex subbracteata | CNPS-EB: B | small-bracted sedge | |
| Carex unilateralis | CNPS-EB: A1 | one-sided sedge | |
| Castilleja exserta subsp. latifolia | CNPS-EB: A1 | owl's-clover | |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Ceanothus thyrsiflorus var. thyrsiflorus | CNPS-EB: B | blue blossom, California lilac | |
| Cirsium andrewsii | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | Franciscan thistle | |
| Cirsium brevistylum | CNPS-EB: B | indian thistle | |
| Cirsium cymosum var. cymosum | CNPS-EB: C | peregrine thistle | |
| Cirsium quercetorum | CNPS-EB: A2 | brownie thistle | |
| Cordylanthus pilosus subsp. pilosus | CNPS-EB: B | hairy bird's-beak | |
| Cornus sericea subsp. occidentalis | CNPS-EB: C | western dogwood | |
| Cornus sericea subsp. sericea | CNPS-EB: C | American dogwood | |
| Cornus sericea subsp. unknown | CNPS-EB: C? | American dogwood | |
| Cryptantha torreyana var. pumila | CNPS-EB: B | Torrey's cryptantha | |
| Cuscuta subinclusa | CNPS-EB: C | canyon dodder | |
| Cyperus erythrorhizos | CNPS-EB: B | red-rooted cyperus | |
| Danthonia californica | CNPS-EB: C | California oat grass | |
| Delphinium hesperium subsp. hesperium | CNPS-EB: B | western larkspur | |
| Deschampsia cespitosa subsp. cespitosa | CNPS-EB: C | tufted hairgrass | |
| Deschampsia elongata | CNPS-EB: C | slender hair grass | |
| Dicentra formosa | CNPS-EB: A2 | Pacific bleeding heart, bleeding heart | |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Elymus xhansenii | CNPS-EB: B | Hansen squirreltail | |
| Equisetum laevigatum | CNPS-EB: A2 | smooth scouring rush | |
| Erigeron petrophilus var. petrophilus | CNPS-EB: B | rock daisy | |
| Erigeron philadelphicus var. philadelphicus | CNPS-EB: C | fleabane | |
| Euonymus occidentalis var. occidentalis | CNPS-EB: A1 | burning bush | |
| Festuca californica | CNPS-EB: C | California fescue | |
| Festuca elmeri | CNPS-EB: A1 | Elmer's fescue | |
| Festuca idahoensis | CNPS-EB: C | Idaho fescue, blue bunchgrass | |
| Festuca rubra | CNPS-EB: C | red fescue | |
| Fraxinus latifolia | CNPS-EB: B | Oregon ash | |
| Galium triflorum | CNPS-EB: C | sweet-scented bedstraw | |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Githopsis specularioides | CNPS-EB: B | common bluecup | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Hemizonia congesta subsp. lutescens | CNPS-EB: B | hayfield tarweed | |
| Heterotheca sessiliflora subsp. bolanderi | (H. s. ssp. echioides is more | CNPS-EB: C | Bolander goldenaster |
| Hieracium albiflorum | CNPS-EB: C | white hawkweed | |
| Horkelia californica var. californica | CNPS-EB: A1 | California horkelia | |
| Horkelia californica var. frondosa | CNPS-EB: B | leafy horkelia | |
| Iris douglasiana | CNPS-EB: B | Douglas iris | |
| Iris longipetala | CNPS-EB: *A1 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | coast iris | |
| Isolepis cernua | (formerly Scirpus cernuus) | CNPS-EB: C | low club-rush |
| Juncus phaeocephalus var. phaeocephalus | CNPS-EB: B | brownheaded rush | |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Lasthenia glabrata subsp. glabrata | CNPS-EB: A2 | yellow-ray goldfields | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | |
| Layia gaillardioides | CNPS-EB: A2 | woodland layia | |
| Layia hieracioides | CNPS-EB: C | tall layia | |
| Layia platyglossa | CNPS-EB: B | tidy-tips | |
| Ligusticum apiifolium | CNPS-EB: A2 | Pacific lovage | |
| Lilium pardalinum subsp. pardalinum | CNPS-EB: A1 | leopard lily | |
| Lomatium caruifolium var. caruifolium | CNPS-EB: B | caraway-leaved lomatium | |
| Lupinus affinis | CNPS-EB: A1 | lupine | |
| Lupinus arboreus | CNPS-EB: A2 | yellow bush lupine | |
| Madia exigua | CNPS-EB: C | ||
| Marah oregana | CNPS-EB: B | coast man-root | |
| Melica californica | CNPS-EB: C | California melic | |
| Moehringia macrophylla | CNPS-EB: A2 | large-leaved sandwort, big-leaf sandwort | |
| Morella californica | (formerly Myrica c.) | CNPS-EB: B | wax myrtle |
| Navarretia mellita | CNPS-EB: C | honey-scented navarretia | |
| Nemophila parviflora var. parviflora | CNPS-EB: B | small-flowered nemophila | |
| Oenothera elata subsp. hookeri | CNPS-EB: C | evening-primrose | |
| Phacelia malvifolia var. malvifolia | CNPS-EB: A2 | stinging phacelia | |
| Piperia elegans subsp. elegans | CNPS-EB: C | coast piperia, elegant piperia | |
| Piperia elongata | CNPS-EB: C | chaparral orchid, wood rein-orchid, elongate piperia | |
| Polypodium scouleri | CNPS-EB: A1 | leather-leaf fern | |
| Prunella vulgaris var. lanceolata | (var. vulgaris is more common) | CNPS-EB: B | selfheal |
| Prunus emarginata | CNPS-EB: C | bitter cherry | |
| Prunus subcordata | CNPS-EB: C | Pacific plum, Sierra plum | |
| Pseudognaphalium beneolens | (formerly Gnaphalium canescens | CNPS-EB: C | fragrant everlasting |
| Quercus garryana var. garryana | CNPS-EB: B | Oregon oak | |
| Quercus wislizeni var. frutescens | CNPS-EB: C | shrubby interior live oak | |
| Ranunculus lobbii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S3 | Lobb's aquatic buttercup | |
| Rhamnus crocea | CNPS-EB: C | spiny redberry | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: C | skunk bush, skunkbrush, squawbush |
| Ribes divaricatum var. pubiflorum | CNPS-EB: C | straggle bush, straggly gooseberry | |
| Rosa spithamea | CNPS-EB: C | coast ground rose, ground rose | |
| Rumex occidentalis | CNPS-EB: A2 | western dock | |
| Rumex salicifolius | (formerly R. salicifolius var. salicifolius) | CNPS-EB: B | willow dock |
| Rumex transitorius | CNPS-EB: B | willow dock | |
| Sagina decumbens subsp. occidentalis | (S. apetala is more common) | CNPS-EB: B | western pearlwort |
| Salix scouleriana | CNPS-EB: A2 | Scouler's willow | |
| Sambucus racemosa var. racemosa | CNPS-EB: B | red elderberry | |
| Sanicula laciniata | CNPS-EB: A2 | coast sanicle | |
| Scirpus microcarpus | CNPS-EB: C | small-fruited bulrush | |
| Scutellaria californica | CNPS-EB: B | California skullcap | |
| Sedum spathulifolium | CNPS-EB: B | broadleaf stonecrop, Pacific stonecrop | |
| Senecio aronicoides | CNPS-EB: C | rayless ragwort, California butterweed | |
| Sequoia sempervirens | CNPS-EB: C | coast redwood | |
| Setaria parviflora | CNPS-EB: B | knotroot bristle grass, perennial foxtail | |
| Sisyrinchium californicum | CNPS-EB: A1 | golden-eyed-grass | |
| Stipa cernua | CNPS-EB: C | nodding needlegrass | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Tellima grandiflora | CNPS-EB: C | fringe cups | |
| Tetrapteron graciliflorum | CNPS-EB: C | hill sun cup | |
| Trifolium fucatum | CNPS-EB: B | bull clover | |
| Triglochin maritima | CNPS-EB: C | common arrow-grass, seaside arrow-grass | |
| Trillium ovatum subsp. ovatum | CNPS-EB: A2 | white trillium | |
| Trisetum canescens | CNPS-EB: A2 | tall trisetum | |
| Turritis glabra | CNPS-EB: B | tower mustard | |
| Vaccinium ovatum | CNPS-EB: C | California huckleberry | |
| Wyethia glabra | (W. helenioides is more common | CNPS-EB: C | mule ears |
| Adiantum aleuticum | (A. jordanii is more common) | CNPS-EB: A1 | five-finger fern |
| Agoseris heterophylla var. unknown | Agoseris heterophylla split into 2 vars. in 2011 Jepson Manual, need field work to resolve vars. | CNPS-EB: B? | annual agoseris |
| Alopecurus saccatus | CNPS-EB: B | Howell's meadow foxtail | |
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | |
| Amsinckia lycopsoides | CNPS-EB: C | bugloss-flowered fiddleneck, bugloss fiddleneck | |
| Androsace elongata subsp. acuta | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5?T3T4 CNDDB Rank: S3S4 | California androsace | |
| Apiastrum angustifolium | CNPS-EB: C | wild celery | |
| Apocynum cannabinum | CNPS-EB: B | dogbane, Indian-hemp | |
| Arctostaphylos crustacea subsp. crustacea | CNPS-EB: C | brittleleaf manzanita | |
| Arctostaphylos crustacea subsp. rosei | CNPS-EB: A1 | Rose's manzanita | |
| Arctostaphylos pallida | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | pallid manzanita | |
| Arnica discoidea | CNPS-EB: B | rayless arnica | |
| California macrophylla | (formerly Erodium macrophyllum | CNPS-EB: B | round-leaved filaree |
| Calochortus splendens | CNPS-EB: A2 | splendid mariposa-lily | |
| Carex gracilior | CNPS-EB: A1 | slender sedge | |
| Carex multicostata | CNPS-EB: A1 | many-ribbed sedge | |
| Carex nebrascensis | CNPS-EB: B | Nebraska sedge | |
| Carex obnupta | CNPS-EB: B | slough sedge | |
| Castilleja subinclusa subsp. franciscana | CNPS-EB: A1 | Franciscan indian paintbrush | |
| Castilleja wightii | CNPS-EB: B | Wight's indian paintbrush | |
| Cirsium occidentale var. occidentale | CNPS-EB: A1x | COBWEBBY THISTLE | |
| Cirsium remotifolium var. odontolepis | CNPS-EB: A1 | remote-leaved thistle | |
| Clarkia purpurea subsp. purpurea | (ssp. quadrivulnera is more co | CNPS-EB: A2 | purple clarkia |
| Clarkia purpurea subsp. viminea | (ssp. quadrivulnera more common | CNPS-EB: A1 | large godetia |
| Corallorhiza maculata var. maculata | (forma immaculata is more comm | CNPS-EB: A2 | spotted coralroot |
| Corallorhiza striata | (C. maculata is more common) | CNPS-EB: A1x | striped coralroot |
| Crassula aquatica | CNPS-EB: B | water pygmy-weed | |
| Crocanthemum scoparium var. vulgare | (formerly Helianthemum scoparium var. vulgare) | CNPS-EB: B | peak rush-rose |
| Cryptantha clevelandii var. florosa | CNPS-EB: B | Cleveland's cryptantha | |
| Cryptantha micromeres | CNPS-EB: A2 | minute-flowered cryptantha | |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | |
| Cuscuta pacifica var. pacifica | (formerly C. salina var. major) | CNPS-EB: C | salt-marsh dodder |
| Deinandra corymbosa | (formerly Hemizonia corymbosa) | CNPS-EB: A2 | coast tarweed |
| Delphinium californicum subsp. californicum | CNPS-EB: B | coast larkspur, California larkspur | |
| Delphinium variegatum subsp. variegatum | CNPS-EB: C | royal larkspur | |
| Deschampsia cespitosa subsp. holciformis | CNPS-EB: B | tufted hairgrass | |
| Diplacus douglasii | (formerly Mimulus d.) | CNPS-EB: A2 | Douglas monkeyflower |
| Dudleya farinosa | CNPS-EB: A2 | bluff lettuce, powdery dudleya | |
| Eleocharis acicularis var. acicularis | CNPS-EB: B | needle spike-rush | |
| Elymus stebbinsii | CNPS-EB: A1x | Stebbins' wheat grass, Parish's wheat-grass | |
| Elymus trachycaulus subsp. trachycaulus | CNPS-EB: A1 | slender wheat grass | |
| Epilobium ciliatum subsp. watsonii | (ssp. ciliatum is more common) | CNPS-EB: A1 | San Francisco willowherb |
| Eragrostis mexicana subsp. virescens | CNPS-EB: A1 | Orcutt's eragrostis | |
| Eriogonum angulosum | CNPS-EB: B | angle-stem wild buckwheat, angle-stemmed eriogonum | |
| Eriogonum fasciculatum var. foliolosum | CNPS-EB: A1 | leafy California buckwheat, California buckwheat | |
| Eriogonum luteolum var. caninum | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Tiburon buckwheat | |
| Eryngium armatum | CNPS-EB: A1 | coastal button-celery, coast coyote-thistle | |
| Erythranthe microphylla | CNPS-EB: A1x | ||
| Erythranthe nasuta | CNPS-EB: B | shy monkeyflower | |
| Fritillaria liliacea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | fragrant fritillary | |
| Gilia capitata subsp. staminea | CNPS-EB: C | blue field gilia | |
| Glyceria leptostachya | CNPS-EB: A1 | narrow manna grass, Davy's mannagrass | |
| Helianthus californicus | CNPS-EB: C | California sunflower | |
| Heterocodon rariflorum | CNPS-EB: A1 | heterocodon | |
| Heterotheca sessiliflora var. bolanderioides | CNPS-EB: A1x | golden aster | |
| Hoita orbicularis | (historical-1936) | CNPS-EB: A1x | round-leaved psoralea |
| Holocarpha macradenia | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | Santa Cruz tarplant | |
| Hordeum brachyantherum subsp. californicum | (ssp. brachyantherum is more common | CNPS-EB: A2 | California barley |
| Juncus oxymeris | CNPS-EB: A1 | pointed rush | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Lepidium dictyotum | CNPS-EB: B | alkali pepper-grass | |
| Lepidium oblongum | (historical-1937) | CNPS-EB: A1x | wayside pepper-grass |
| Lepidium oxycarpum | CNPS-EB: A2 | sharp-podded pepper-grass | |
| Leptosiphon androsaceus | (formerly Linanthus a.) | CNPS-EB: C | common linanthus, common leptosiphon |
| Leptosiphon aureus | (formerly L.acicularis, Linanthus acicularis) | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4? CNDDB Rank: S4? | bristly leptosiphon, bristly linanthus |
| Leptosiphon grandiflorus | (formerly Linanthus g.) | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G3G4 CNDDB Rank: S3S4 | large-flowered leptosiphon, large-flowered linanthus |
| Leptosiphon parviflorus | (formerly Linanthus p.) | CNPS-EB: B | small-flowered linanthus, small-flowered leptosiphon |
| Lupinus littoralis var. variicolor | (formerly L. variicolor) | CNPS-EB: A1? | bluff lupine |
| Lupinus luteolus | CNPS-EB: A1x | butter lupine | |
| Lysimachia minima | (formerly Anagallis minima, Centunculus minimus) | CNPS-EB: A1 | chaffweed |
| Malacothrix floccifera | CNPS-EB: C | woolly malacothrix | |
| Meconella californica | CNPS-EB: A1x | California meconella | |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 | Oregon meconella | |
| Melica bulbosa | CNPS-EB: A1 | onion grass | |
| Mentha canadensis | CNPS-EB: B | American cornmint, Japanese peppermint | |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed |
| Micropus californicus var. subvestitus | (var. californicus is more common) | CNPS-EB: A2 | slender cottonweed |
| Microseris bigelovii | (historical-1891) | CNPS-EB: A1x | coast microseris |
| Microseris douglasii subsp. tenella | (subsp douglasii is more common) | CNPS-EB: A2 | silver puffs |
| Microseris sylvatica | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | sylvan microseris | |
| Monolopia major | CNPS-EB: B | cupped monolopia | |
| Montia fontana | CNPS-EB: C | water chickweed, blinks, water chickweed | |
| Myosurus minimus subsp. minimus | CNPS-EB: C | common mouse-tail | |
| Navarretia pubescens | CNPS-EB: C | downy navarretia | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | |
| Oxalis oregana | CNPS-EB: A1 | redwood sorrel | |
| Papaver californicum | CNPS-EB: B | fire poppy | |
| Penstemon heterophyllus var. heterophyllus | CNPS-EB: B | chaparral penstemon | |
| Pentachaeta alsinoides | CNPS-EB: C | tiny pentachaeta | |
| Perideridia gairdneri subsp. gairdneri | CNPS-EB: *A1x State CNPS: 4.2 Global Rank: G5T3T4 CNDDB Rank: S3S4 | Gairdner's yampah | |
| Persicaria lapathifolia | (formerly Polygonum lapathifol | CNPS-EB: B | willow weed |
| Petasites frigidus var. palmatus | CNPS-EB: A1 | western sweet coltsfoot, coltsfoot | |
| Petunia parviflora | CNPS-EB: A1 | wild petunia | |
| Phacelia divaricata | CNPS-EB: B | divaricate phacelia | |
| Phacelia douglasii | CNPS-EB: A1 | Douglas' phacelia | |
| Phacelia ramosissima | CNPS-EB: B | branching phacelia | |
| Phacelia tanacetifolia | CNPS-EB: B | tansy phacelia | |
| Phalaris californica | (historical-1943) | CNPS-EB: A1x | California canary grass |
| Phalaris lemmonii | CNPS-EB: A1 | Lemmon's canary-grass | |
| Pinus attenuata | CNPS-EB: A1 | knobcone pine | |
| Pinus coulteri | CNPS-EB: B | Coulter pine | |
| Piperia michaelii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Michael's rein-orchid | |
| Platanthera dilatata var. leucostachys | (formerly P. l.) (historical-1 | CNPS-EB: A1x | white-flowered bog-orchid |
| Poa howellii | CNPS-EB: A2 | Howell's bluegrass | |
| Pogogyne douglasii | (historical-1940) | CNPS-EB: A1x | Douglas' beardstyle, Douglas pogogyne |
| Pseudognaphalium biolettii | (formerly Gnaphalium bicolor) | CNPS-EB: A1 | Bioletti's cudweed |
| Pseudognaphalium microcephalum | (formerly Gnaphalium canescens | CNPS-EB: A1 | white everlasting |
| Psilocarphus chilensis | (formerly P. tenellus var. glo | CNPS-EB: A1 | round woolly marbles, round woolly-marbles |
| Quercus lobata | CNPS-EB: B | valley oak, roble | |
| Quercus xchasei | CNPS-EB: B | Chase oak | |
| Ranunculus orthorhynchus var. bloomeri | CNPS-EB: A1x | Bloomer's buttercup | |
| Ranunculus orthorhynchus var. orthorhynchus | (historical-1895) | CNPS-EB: A1x | straight-beaked buttercup |
| Ribes amarum | CNPS-EB: A1? | bitter gooseberry | |
| Ribes aureum var. gracillimum | CNPS-EB: A2 | golden currant | |
| Ribes malvaceum var. malvaceum | CNPS-EB: C | chaparral currant | |
| Ribes quercetorum | CNPS-EB: A2 | oakwoods gooseberry, oak gooseberry | |
| Rubus spectabilis | CNPS-EB: A1x | salmonberry | |
| Rumex californicus | (formerly R. salicifolius var. dentatus) | CNPS-EB: C | willow dock |
| Sabulina pusilla | (formerly Minuartia pusilla) | CNPS-EB: A1 | annual sandwort, least sandwort |
| Sanicula arctopoides | CNPS-EB: A1x | footsteps of spring, yellow mats | |
| Senecio hydrophilus | CNPS-EB: A2 | water ragwort, alkali-marsh ragwort, alkali-marsh butterweed | |
| Silene laciniata subsp. californica | (formerly Silene c.) | CNPS-EB: C | Indian pink, California pink, California Indian pink |
| Stachys ajugoides | (var. rigida is more common) | CNPS-EB: A2 | bugle hedge nettle |
| Stebbinsoseris heterocarpa | CNPS-EB: C | grassland silverpuffs, derived microseris | |
| Stephanomeria elata | CNPS-EB: A1 | stephanomeria | |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | most beautiful jewel-flower | |
| Streptanthus glandulosus subsp. glandulosus | CNPS-EB: B | jewelflower | |
| Symphyotrichum lanceolatum var. hesperium | (formerly Aster lanceolatus ss | CNPS-EB: A2 | marsh aster |
| Symphyotrichum subulatum var. parviflorum | (formerly Aster subulatus var. | CNPS-EB: B | slim aster |
| Taxus brevifolia | CNPS-EB: A1 | PACIFIC YEW | |
| Trifolium barbigerum | CNPS-EB: A2 | bearded clover | |
| Trifolium dichotomum | CNPS-EB: C | branched indian clover | |
| Trifolium macraei | CNPS-EB: A1 | Macrae's clover, double-headed clover | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Trifolium olivaceum | CNPS-EB: C | olive clover | |
| Trifolium wormskioldii | CNPS-EB: A1 | cow clover | |
| Triodanis biflora | CNPS-EB: A2 | Venus' looking-glass | |
| Tropidocarpum gracile | CNPS-EB: B | slender tropidocarpum | |
| Viola glabella | CNPS-EB: A2 | stream violet, smooth yellow violet | |
| Viola sempervirens | CNPS-EB: A2 | evergreen violet, redwood violet | |
| Zeltnera davyi | (formerly Centaurium d.) | CNPS-EB: B | Davy's centaury, conchalagua |