| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Centromadia parryi subsp. congdonii | (formerly Hemizonia p. ssp. c. | CNPS-EB: *A2 State CNPS: 1B.1 | Congdon's tarplant |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 | Diablo helianthella | |
| Downingia pulchella | CNPS-EB: B-PV | flat-faced downingia | |
| Plagiobothrys canescens var. canescens | CNPS-EB: C | valley popcornflower |