| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Aralia californica | CNPS-EB: C | elk clover | |
| Arctostaphylos glandulosa subsp. glandulosa | CNPS-EB: B | Eastwood manzanita | |
| Carex barbarae | CNPS-EB: C | whiteroot sedge, Santa Barbara sedge, St. Barbara's sedge | |
| Cirsium brevistylum | CNPS-EB: B | indian thistle | |
| Cornus sericea subsp. sericea | CNPS-EB: C | American dogwood | |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Fraxinus latifolia | CNPS-EB: B | Oregon ash | |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Iris douglasiana | CNPS-EB: B | Douglas iris | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | |
| Layia hieracioides | CNPS-EB: C | tall layia | |
| Layia platyglossa | CNPS-EB: B | tidy-tips | |
| Melica californica | CNPS-EB: C | California melic | |
| Nemophila parviflora var. parviflora | CNPS-EB: B | small-flowered nemophila | |
| Polypodium scouleri | CNPS-EB: A1 | leather-leaf fern | |
| Sequoia sempervirens | CNPS-EB: C | coast redwood | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Vaccinium ovatum | CNPS-EB: C | California huckleberry | |
| Acaena californica | (formerly A. pinnatifida var. californica) | CNPS-EB: C | California acaena |
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | |
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | |
| 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 | |
| Arctostaphylos crustacea subsp. crustacea | CNPS-EB: C | brittleleaf manzanita | |
| Arnica discoidea | CNPS-EB: B | rayless arnica | |
| California macrophylla | (formerly Erodium macrophyllum | CNPS-EB: B | round-leaved filaree |
| Calochortus umbellatus | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3? CNDDB Rank: S3? | Oakland star-tulip | |
| Carex gracilior | CNPS-EB: A1 | slender sedge | |
| Castilleja subinclusa subsp. franciscana | CNPS-EB: A1 | Franciscan indian paintbrush | |
| Ceanothus thyrsiflorus var. thyrsiflorus | CNPS-EB: B | blue blossom, California lilac | |
| Erythranthe nasuta | CNPS-EB: A2 | shy monkeyflower | |
| Festuca californica | CNPS-EB: C | California fescue | |
| Festuca idahoensis | CNPS-EB: C | Idaho fescue, blue bunchgrass | |
| Festuca rubra | CNPS-EB: C | red fescue | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Heterotheca sessiliflora subsp. bolanderi | (H. s. ssp. echioides is more | CNPS-EB: C | Bolander goldenaster |
| Hoita orbicularis | (historical-1936) | CNPS-EB: A1x | round-leaved psoralea |
| Horkelia californica var. californica | CNPS-EB: A1 | California horkelia | |
| Horkelia californica var. frondosa | CNPS-EB: B | leafy horkelia | |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Lupinus littoralis var. variicolor | (formerly L. variicolor) | CNPS-EB: A1? | bluff lupine |
| Malacothrix floccifera | CNPS-EB: C | woolly malacothrix | |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed |
| Monolopia major | CNPS-EB: B | cupped monolopia | |
| Phacelia divaricata | CNPS-EB: B | divaricate phacelia | |
| Piperia elegans subsp. elegans | CNPS-EB: C | coast piperia, elegant piperia | |
| Poa howellii | CNPS-EB: A2 | Howell's bluegrass | |
| Quercus xchasei | CNPS-EB: B | Chase oak | |
| Ribes amarum | CNPS-EB: A1? | bitter gooseberry | |
| Rosa spithamea | CNPS-EB: C | coast ground rose, ground rose | |
| Salix scouleriana | CNPS-EB: A2 | Scouler's willow | |
| Sanicula arctopoides | CNPS-EB: A1x | footsteps of spring, yellow mats | |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | most beautiful jewel-flower | |
| Viola glabella | CNPS-EB: A2 | stream violet, smooth yellow violet |