| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Calochortus umbellatus | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3? CNDDB Rank: S3? | Oakland star-tulip | |
| Carex nebrascensis | CNPS-EB: B | Nebraska sedge | |
| Cyperus erythrorhizos | CNPS-EB: B | red-rooted cyperus | |
| Deschampsia cespitosa subsp. cespitosa | CNPS-EB: C | tufted hairgrass | |
| Eleocharis acicularis var. acicularis | CNPS-EB: B | needle spike-rush | |
| Populus trichocarpa | (formerly P. balsamifera var. | CNPS-EB: C | black cottonwood |
| Dirca occidentalis | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | western leatherwood | |
| Scirpus microcarpus | CNPS-EB: C | small-fruited bulrush |