| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Calamagrostis rubescens | CNPS-EB: B | pine reed grass, pine grass | |
| Carex densa | CNPS-EB: B | dense sedge | |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | |
| Epilobium ciliatum subsp. watsonii | (ssp. ciliatum is more common) | CNPS-EB: A1 | San Francisco willowherb |
| Erigeron petrophilus var. petrophilus | CNPS-EB: B | rock daisy | |
| Erythranthe nasuta | CNPS-EB: A2 | shy monkeyflower | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2G3 CNDDB Rank: S2 | Oregon meconella | |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed |
| Micropus californicus var. subvestitus | (var. californicus is more common) | CNPS-EB: A2 | slender cottonweed |
| Salix scouleriana | CNPS-EB: A2 | Scouler's willow | |
| Sambucus racemosa var. racemosa | CNPS-EB: B | red elderberry |