| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | |
| Amaranthus blitoides | CNPS-EB: C | procumbent pigweed, prostrate amaranth | |
| Aphyllon purpureum | CNPS-EB: C | naked broomrape | |
| Asclepias cordifolia | (A. californica is more common | CNPS-EB: A1 | purple milkweed |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Collinsia sparsiflora var. sparsiflora | CNPS-EB: C | few-flowered blue-eyed Mary | |
| Crocanthemum scoparium var. vulgare | (formerly Helianthemum scoparium var. vulgare) | CNPS-EB: B | peak rush-rose |
| Delphinium hesperium subsp. hesperium | CNPS-EB: B | western larkspur | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Melica californica | CNPS-EB: C | California melic | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | |
| Phoradendron leucarpum subsp. macrophyllum | (formerly P. serotinum subsp. macrophyllum, P. macrophyllum) | CNPS-EB: C | big leaf mistletoe |
| Platanus racemosa | CNPS-EB: C | western sycamore, California sycamore | |
| Quercus lobata | CNPS-EB: B | valley oak, roble | |
| Scutellaria tuberosa | CNPS-EB: C | Dannie's skullcap | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Agoseris heterophylla var. unknown | Agoseris heterophylla split into 2 vars. in 2011 Jepson Manual, need field work to resolve vars. | CNPS-EB: B? | annual agoseris |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | |
| Festuca idahoensis | CNPS-EB: C | Idaho fescue, blue bunchgrass | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | |
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | |
| Madia exigua | CNPS-EB: C | ||
| Microseris elegans | CNPS-EB: A1 | elegant microseris | |
| Turritis glabra | CNPS-EB: B | tower mustard |