| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Cuscuta pacifica var. pacifica | (formerly C. salina var. major) | CNPS-EB: C | salt-marsh dodder |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Lasthenia conjugens | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE | Contra Costa goldfields | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | |
| Lepidium latipes | CNPS-EB: B | dwarf peppergrass | |
| Plagiobothrys trachycarpus | CNPS-EB: C | rough-nutlet popcornflower, rough-fruited allocarya | |
| Triglochin striata | (T. maritima is more common) | CNPS-EB: B | three-ribbed arrow-grass |
| Cyperus erythrorhizos | CNPS-EB: B | red-rooted cyperus | |
| Cyperus odoratus | CNPS-EB: A1 | coarse cyperus | |
| Eclipta prostrata | CNPS-EB: A1 | false daisy | |
| Eleocharis acicularis var. acicularis | CNPS-EB: B | needle spike-rush | |
| Pleuropogon californicus var. californicus | CNPS-EB: B | semaphore grass | |
| Rumex fueginus | CNPS-EB: A2 | golden dock |