| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Agoseris heterophylla var. heterophylla | CNPS-EB: C | ||
| Alisma triviale | (formerly A. plantago-aquatica | CNPS-EB: C | water plantain |
| Amaranthus californicus | CNPS-EB: B | Californian amaranth | |
| Arbutus menziesii | CNPS-EB: B | Pacific madrone | |
| Blennosperma nanum var. nanum | CNPS-EB: C | blennosperma | |
| 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 |
| Collinsia parviflora | CNPS-EB: B | blue-eyed Mary | |
| Danthonia californica | CNPS-EB: C | California oat grass | |
| Leptosiphon aureus | (formerly L.acicularis, Linanthus acicularis) | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4? CNDDB Rank: S4? | bristly leptosiphon, bristly linanthus |
| Mentzelia lindleyi | CNPS-EB: B | Lindley's blazing star | |
| Micropus californicus var. subvestitus | (var. californicus is more common) | CNPS-EB: A2 | slender cottonweed |
| Montia fontana | CNPS-EB: C | water chickweed, blinks, water chickweed | |
| Osmorhiza brachypoda | CNPS-EB: C | California cicely | |
| Pentachaeta alsinoides | CNPS-EB: C | tiny pentachaeta | |
| Plagiobothrys canescens var. canescens | CNPS-EB: C | valley popcornflower | |
| Plagiobothrys humistratus | CNPS-EB: A2 | low popcornflower, dwarf allocarya | |
| Quercus garryana var. garryana | CNPS-EB: B | Oregon oak | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Thysanocarpus laciniatus | CNPS-EB: B | lacepod | |
| Trifolium barbigerum | CNPS-EB: A2 | bearded clover | |
| Agoseris retrorsa | CNPS-EB: A2 | spear-leaved agoseris | |
| Calamagrostis koelerioides | 2 questionable ID sites. Needs field research | CNPS-EB: A1? | tufted pine grass |
| Carex praegracilis | CNPS-EB: C | black creeper sedge, freeway sedge, deer-bed sedge | |
| 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 |
| Clarkia concinna subsp. concinna | CNPS-EB: C | large godetia | |
| Cornus glabrata | CNPS-EB: A1 | brown dogwood | |
| Crassula aquatica | CNPS-EB: B | water pygmy-weed | |
| Deschampsia cespitosa subsp. cespitosa | CNPS-EB: C | tufted hairgrass | |
| Deschampsia elongata | CNPS-EB: C | slender hair grass | |
| Eleocharis acicularis var. acicularis | CNPS-EB: B | needle spike-rush | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Epilobium campestre | CNPS-EB: B | smooth boisduvalia | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | |
| Fraxinus dipetala | CNPS-EB: B | California ash, flowering ash | |
| Gilia tricolor subsp. diffusa | CNPS-EB: C | birds-eye gilia | |
| Horkelia californica var. frondosa | CNPS-EB: B | leafy horkelia | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Leptosiphon androsaceus | (formerly Linanthus a.) | CNPS-EB: C | common linanthus, common leptosiphon |
| Limosella acaulis | CNPS-EB: A1 | southern mudwort | |
| Madia exigua | CNPS-EB: C | ||
| Meconella californica | CNPS-EB: A1x | California meconella | |
| Melica californica | CNPS-EB: C | California melic | |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed |
| Microseris acuminata | CNPS-EB: A1 | Sierra Foothills microseris | |
| Navarretia pubescens | CNPS-EB: C | downy navarretia | |
| Nemophila parviflora var. parviflora | CNPS-EB: B | small-flowered nemophila | |
| Pentachaeta exilis subsp. exilis | CNPS-EB: A1 | meager pentachaeta | |
| Platanus racemosa | CNPS-EB: C | western sycamore, California sycamore | |
| Psilocarphus chilensis | (formerly P. tenellus var. glo | CNPS-EB: A1 | round woolly marbles, round woolly-marbles |
| Quercus lobata | CNPS-EB: B | valley oak, roble | |
| Rhamnus crocea | CNPS-EB: C | spiny redberry | |
| Ribes divaricatum var. pubiflorum | CNPS-EB: C | straggle bush, straggly gooseberry | |
| Sagina decumbens subsp. occidentalis | (S. apetala is more common) | CNPS-EB: B | western pearlwort |
| Scutellaria tuberosa | CNPS-EB: C | Dannie's skullcap | |
| Stephanomeria elata | CNPS-EB: A1 | stephanomeria | |
| Streptanthus glandulosus subsp. glandulosus | CNPS-EB: B | jewelflower | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Trillium ovatum subsp. ovatum | CNPS-EB: A2 | white trillium |