| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 | Mount Diablo fairy-lantern | |
| Eriastrum abramsii | CNPS-EB: A2 | Abram's eriastrum | |
| Galium andrewsii subsp. gatense | CNPS-EB: *A2 State CNPS: 4.2 | phlox-leaf serpentine bedstraw, serpentine bedstraw | |
| Hesperolinon breweri | CNPS-EB: *A2 State CNPS: 1B.2 | Brewer's western flax | |
| Hesperolinon micranthum | CNPS-EB: A2 | small-flowered dwarf flax | |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 | big tarplant | |
| Eriastrum pluriflorum subsp. pluriflorum | CNPS-EB: A1 | many-flowered eriastrum | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 | Diablo helianthella | |
| Ericameria arborescens | CNPS-EB: B-PV | golden-fleece | |
| Pickeringia montana var. montana | CNPS-EB: B-PV | chaparral pea | |
| Forestiera pubescens | CNPS-EB: B-PV | desert olive | |
| Fraxinus dipetala | CNPS-EB: B | California ash, flowering ash | |
| Quercus berberidifolia | CNPS-EB: B | scrub oak | |
| Stipa lepida | CNPS-EB: B-PV | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: B-PV | purple needlegrass |