| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Erigeron philadelphicus var. philadelphicus | CNPS-EB: C | fleabane | |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Prunus emarginata | CNPS-EB: C | bitter cherry | |
| Zeltnera davyi | (formerly Centaurium d.) | CNPS-EB: B | Davy's centaury, conchalagua |
| Allophyllum gilioides subsp. gilioides | CNPS-EB: A2 | straggling gilia | |
| Carex barbarae | CNPS-EB: C | whiteroot sedge, Santa Barbara sedge, St. Barbara's sedge | |
| Meconella oregana | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G2 CNDDB Rank: S2 | Oregon meconella | |
| Stuckenia filiformis subsp. alpina | (formerly Potamogeton f.) | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G5T5 CNDDB Rank: S2S3 | slender-leaved potamogeton |