Shell Ridge
Region: Mt. Diablo AreaKey
| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Fritillaria liliacea | CNPS-EB: *A2 State CNPS: 1B.2 | fragrant fritillary | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 | Diablo helianthella | |
| Horkelia californica var. elata | CNPS-EB: A2 | tall horkelia | |
| Penstemon heterophyllus var. purdyi | CNPS-EB: A2 | foothill penstemon | |
| Perideridia oregana | CNPS-EB: A2 | yampah | |
| Sidalcea diploscypha | CNPS-EB: A2 | fringed checkerbloom, fringed sidalcea | |
| Androsace elongata subsp. acuta | CNPS-EB: *A2 State CNPS: 4.2 | California androsace | |
| Castilleja applegatei subsp. martinii | CNPS-EB: A2 | wavy-leaved indian paintbrush | |
| Cephalanthus occidentalis | CNPS-EB: A2 | button bush | |
| Eleocharis rostellata | CNPS-EB: A1 | beaked spike-rush | |
| Eragrostis mexicana subsp. virescens | CNPS-EB: A1 | Orcutt's eragrostis | |
| Meconella californica | CNPS-EB: A1x | California meconella | |
| Sabulina californica | (formerly Minuartia californica) | CNPS-EB: A1 | California sandwort |
| Spergularia macrotheca var. leucantha | CNPS-EB: A2 | large-flowered sand spurry | |
| Allium unifolium | CNPS-EB: B-PV | one-leaved onion | |
| Anemopsis californica | CNPS-EB: B-PV | yerba mansa, lizard tail | |
| Collinsia sparsiflora var. sparsiflora | CNPS-EB: C | few-flowered blue-eyed Mary | |
| Gilia capitata subsp. staminea | CNPS-EB: B-PV | blue field gilia | |
| Helianthus gracilentus | CNPS-EB: B | slender sunflower | |
| Layia gaillardioides | CNPS-EB: B-PV | woodland layia | |
| Packera breweri | (formerly Senecio b.) | CNPS-EB: B-PV | Brewer's ragwort, Brewer's butterweed |
| Ranunculus canus var. canus | CNPS-EB: C | Sacramento Valley buttercup | |
| Ranunculus occidentalis var. occidentalis | CNPS-EB: B | western buttercup | |
| Stellaria nitens | CNPS-EB: B-PV | shining chickweed | |
| Vicia hassei | CNPS-EB: B | slender vetch | |
| Zeltnera davyi | (formerly Centaurium d.) | CNPS-EB: B-PV | Davy's centaury, conchalagua |
| Agrostis hallii | CNPS-EB: B | Hall's bent grass | |
| Eriophyllum lanatum var. achilleoides | CNPS-EB: C | woolly sunflower | |
| Juncus mexicanus | CNPS-EB: C | Mexican rush | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Juncus phaeocephalus var. phaeocephalus | CNPS-EB: C | brownheaded rush | |
| Plagiobothrys trachycarpus | CNPS-EB: C | rough-nutlet popcornflower, rough-fruited allocarya | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: B-PV | skunk bush, skunkbrush, squawbush |
| Stipa pulchra | CNPS-EB: B-PV | purple needlegrass |
