| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Populus trichocarpa | (formerly P. balsamifera var. | CNPS-EB: C | black cottonwood |
| Collinsia sparsiflora var. sparsiflora | CNPS-EB: C | few-flowered blue-eyed Mary | |
| Hemizonia congesta subsp. lutescens | CNPS-EB: B | hayfield tarweed | |
| Microseris bigelovii | (historical-1891) | CNPS-EB: A1x | coast microseris |
| Tetrapteron graciliflorum | CNPS-EB: B-PV | hill sun cup |