| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Lessingia hololeuca | (historical-1940) | CNPS-EB: *A1x State CNPS: 3 Global Rank: G2G3 CNDDB Rank: S2S3 | woolly-headed lessingia |
| Micropus amphibolus | (historical - 1955) | CNPS-EB: *A1x State CNPS: 3.2 Global Rank: G3G4 CNDDB Rank: S3S4 | Mount Diablo cottonseed, Mt. Diablo cottonweed |
| Myosurus minimus subsp. apus | CNPS-EB: *A1? State CNPS: 3.1 Global Rank: G5T2Q CNDDB Rank: S2 | little mousetail | |
| Polygonum marinense | CNPS-EB: *A1x State CNPS: 3.1 Global Rank: G2Q CNDDB Rank: S2 | MARIN KNOTWEED |