| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Aphyllon vallicola | CNPS-EB: B | California broom-rape | |
| Arctostaphylos crustacea subsp. crustacea | CNPS-EB: C | brittleleaf manzanita | |
| Arctostaphylos pallida | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | pallid manzanita | |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Kopsiopsis strobilacea | (formerly Boschniakia strobilacea) | CNPS-EB: A1 | California ground-cone |
| Phacelia tanacetifolia | CNPS-EB: B | tansy phacelia | |
| Pickeringia montana var. montana | CNPS-EB: C | chaparral pea | |
| Quercus parvula var. shrevei | CNPS-EB: A1 | island scrub oak | |
| Rosa spithamea | CNPS-EB: C | coast ground rose, ground rose | |
| Amsinckia lunaris | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | bent-flowered fiddleneck | |
| Arbutus menziesii | CNPS-EB: B | Pacific madrone | |
| Arctostaphylos glandulosa subsp. cushingiana | CNPS-EB: A1x | CUSHING MANZANITA | |
| Arctostaphylos glandulosa subsp. glandulosa | CNPS-EB: B | Eastwood manzanita | |
| Calochortus umbellatus | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3? CNDDB Rank: S3? | Oakland star-tulip | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Holocarpha macradenia | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FT CESA Status: CE | Santa Cruz tarplant | |
| Layia gaillardioides | CNPS-EB: A2 | woodland layia | |
| Malacothrix floccifera | CNPS-EB: C | woolly malacothrix | |
| 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 |
| Navarretia mellita | CNPS-EB: C | honey-scented navarretia | |
| Quercus wislizeni var. frutescens | CNPS-EB: C | shrubby interior live oak | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass |