| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Symphyotrichum lentum | (formerly Aster lentus) | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Suisun marsh aster |
| Lilaeopsis masonii | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 CESA Status: CR | Mason's lilaeopsis | |
| Triglochin maritima | CNPS-EB: C | common arrow-grass, seaside arrow-grass |