| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Balsamorhiza deltoidea | CNPS-EB: B-PV | deltoid balsamroot | |
| Blennosperma nanum var. nanum | CNPS-EB: C | blennosperma | |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1G2 CNDDB Rank: S1S2 | big tarplant | |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | |
| Clarkia modesta | CNPS-EB: A2 | modest clarkia | |
| Delphinium hansenii subsp. hansenii | CNPS-EB: A2 | Hansen's larkspur | |
| Eryngium jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | ||
| Gilia capitata subsp. staminea | CNPS-EB: B-PV | blue field gilia | |
| Githopsis specularioides | CNPS-EB: B | common bluecup | |
| Gutierrezia californica | CNPS-EB: B-PV | California matchweed | |
| Lepechinia calycina | CNPS-EB: C | pitcher sage | |
| Lepidium latipes | CNPS-EB: B-PV | dwarf peppergrass | |
| Leptosiphon ciliatus | (formerly Linanthus c.) | CNPS-EB: C | whisker brush |
| Lupinus concinnus | CNPS-EB: A1 | Bajada lupine | |
| Malacothamnus fremontii var. fremontii | CNPS-EB: B-PV | white-coat mallow | |
| Mentzelia affinis | CNPS-EB: B | hydra stick-leaf | |
| Navarretia nigelliformis subsp. radians | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G4T2T3 CNDDB Rank: S2S3 | shining navarretia | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | |
| Penstemon centranthifolius | CNPS-EB: B | scarlet bugler | |
| Pinus coulteri | CNPS-EB: B-PV | Coulter pine | |
| Plantago elongata | CNPS-EB: B-PV | annual coast plantain | |
| Pogogyne zizyphoroides | CNPS-EB: A2 | Sacramento beardstyle | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: C | skunk bush, skunkbrush, squawbush |
| Amsinckia grandiflora | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | large-flowered fiddleneck | |
| Arctostaphylos auriculata | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo manzanita | |
| Fraxinus dipetala | CNPS-EB: B | California ash, flowering ash | |
| Lepidium acutidens | CNPS-EB: C | sharp-toothed pepper-grass | |
| Packera breweri | (formerly Senecio b.) | CNPS-EB: B-PV | Brewer's ragwort, Brewer's butterweed |