| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Carex comosa | CNPS-EB: *A1x State CNPS: 2B.1 | bristly sedge | |
| Cicuta maculata var. bolanderi | CNPS-EB: *A1 State CNPS: 2B.1 | Bolander's water-hemlock, water hemlock | |
| Polemonium carneum | CNPS-EB: *A1x State CNPS: 2B.2 | Oregon polemonium, great polemonium | |
| Potamogeton zosteriformis | (historical-1949) | CNPS-EB: *A1x State CNPS: 2B.2 | eel-grass pondweed |
| Scutellaria galericulata | (historical-1949) | CNPS-EB: *A1x State CNPS: 2B.2 | marsh skullcap |
| Senecio aphanactis | CNPS-EB: *A1x State CNPS: 2B.2 | chaparral ragwort, rayless ragwort | |
| Stuckenia filiformis subsp. alpina | (formerly Potamogeton f.) | CNPS-EB: *A1x State CNPS: 2B.2 | slender-leaved potamogeton |
| Viburnum ellipticum | CNPS-EB: *A2 State CNPS: 2B.3 | oval-leaved viburnum | |
| Wolffia brasiliensis | CNPS-EB: *A1 State CNPS: 2B.3 | Brazilian watermeal |