Winter Island
| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Helenium bigelovii | (H. puberulum is more common) | CNPS-EB: A2 | Bigelow's sneezeweed |
| Senecio hydrophilus | CNPS-EB: A2 | water ragwort, alkali-marsh ragwort, alkali-marsh butterweed | |
| Lathyrus jepsonii var. jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 | delta tule pea, Delta tule pea | |
| Lilaeopsis masonii | CNPS-EB: *A2 State CNPS: 1B.1 CESA Status: CR | Mason's lilaeopsis | |
| Apocynum cannabinum | CNPS-EB: B-PV | dogbane, Indian-hemp | |
| Hydrocotyle verticillata | CNPS-EB: B | whorled marsh pennywort | |
| Bidens laevis | CNPS-EB: B | bur-marigold | |
| Pluchea odorata var. odorata | CNPS-EB: B-PV | saltmarsh fleabane |
