| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Agoseris heterophylla var. cryptopleura | CNPS-EB: B | ||
| Ancistrocarphus filagineus | CNPS-EB: C | woolly fishhooks | |
| Arctostaphylos glauca | CNPS-EB: C | big-berried manzanita | |
| Berula erecta | CNPS-EB: C | cutleaf water-parsnip | |
| Boechera breweri subsp. breweri | (formerly Arabis breweri) | CNPS-EB: B | Brewer's rockcress |
| Campanula griffinii | CNPS-EB: A1 | Griffin's campanula | |
| Carex barbarae | CNPS-EB: C | whiteroot sedge, Santa Barbara sedge, St. Barbara's sedge | |
| Carex densa | CNPS-EB: B | dense sedge | |
| Carex serratodens | CNPS-EB: C | saw-toothed sedge, bifid sedge | |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Caulanthus flavescens | CNPS-EB: A2 | yellow-flowered thelypodium | |
| Cirsium douglasii var. douglasii | CNPS-EB: A1 | swamp thistle | |
| Clarkia concinna subsp. concinna | CNPS-EB: C | large godetia | |
| Claytonia exigua subsp. exigua | CNPS-EB: C | common montia | |
| Collinsia sparsiflora var. sparsiflora | CNPS-EB: C | few-flowered blue-eyed Mary | |
| Crassula aquatica | CNPS-EB: B | water pygmy-weed | |
| Cyperus niger | CNPS-EB: A2 | black sedge | |
| Dudleya cymosa subsp. paniculata | CNPS-EB: B | spreading dudleya | |
| Eleocharis parishii | CNPS-EB: A1 | Dombey's spike-rush | |
| Eriogonum gracile var. gracile | CNPS-EB: C | slender woolly wild buckwheat, slender buckwheat | |
| Eriogonum roseum | CNPS-EB: A2 | wand wild buckwheat, virgate buckwheat | |
| Eriophyllum lanatum var. achilleoides | CNPS-EB: C | woolly sunflower | |
| Euphorbia ocellata subsp. ocellata | CNPS-EB: B | valley spurge | |
| Euphorbia serpillifolia subsp. serpillifolia | CNPS-EB: C | thyme-leaved spurge | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | |
| Forestiera pubescens | CNPS-EB: B | desert olive | |
| Gilia capitata subsp. capitata | CNPS-EB: A1 | blue field gilia | |
| Gilia capitata subsp. staminea | CNPS-EB: C | blue field gilia | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Helianthus californicus | CNPS-EB: C | California sunflower | |
| Helianthus gracilentus | CNPS-EB: B | slender sunflower | |
| Hesperolinon californicum | CNPS-EB: C | California dwarf flax | |
| Horkelia californica var. elata | CNPS-EB: A2 | tall horkelia | |
| Lasthenia glaberrima | CNPS-EB: B | smooth goldfields | |
| Layia gaillardioides | CNPS-EB: A2 | woodland layia | |
| Madia exigua | CNPS-EB: C | ||
| Malacothamnus hallii | (M. fasciculatus in Jepson Man | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Hall's bush-mallow |
| Melica californica | CNPS-EB: C | California melic | |
| Monardella douglasii | CNPS-EB: A2 | fenestra monardella, Fenestra monardella | |
| Monolopia major | CNPS-EB: B | cupped monolopia | |
| Myriopteris covillei | CNPS-EB: C | Coville's lip fern | |
| Myriopteris gracillima | CNPS-EB: A1 | lace fern | |
| Myriopteris intertexta | CNPS-EB: B | coastal lip fern | |
| Oenothera elata subsp. hookeri | CNPS-EB: C | evening-primrose | |
| Phoradendron leucarpum subsp. macrophyllum | (formerly P. serotinum subsp. macrophyllum, P. macrophyllum) | CNPS-EB: C | big leaf mistletoe |
| Pickeringia montana var. montana | CNPS-EB: C | chaparral pea | |
| Plagiobothrys acanthocarpus | CNPS-EB: B | adobe popcornflower, adobe allocarya | |
| Plagiobothrys trachycarpus | CNPS-EB: C | rough-nutlet popcornflower, rough-fruited allocarya | |
| Pseudognaphalium beneolens | (formerly Gnaphalium canescens | CNPS-EB: C | fragrant everlasting |
| Pseudognaphalium microcephalum | (formerly Gnaphalium canescens | CNPS-EB: A1 | white everlasting |
| Ranunculus occidentalis var. occidentalis | CNPS-EB: B | western buttercup | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: C | skunk bush, skunkbrush, squawbush |
| Rorippa curvisiliqua | CNPS-EB: B | yellow cress | |
| Stebbinsoseris heterocarpa | CNPS-EB: C | grassland silverpuffs, derived microseris | |
| Stellaria nitens | CNPS-EB: C | shining chickweed | |
| Streptanthus albidus subsp. peramoenus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2T2 CNDDB Rank: S2 | most beautiful jewel-flower | |
| Tetrapteron graciliflorum | CNPS-EB: C | hill sun cup | |
| Trifolium olivaceum | CNPS-EB: C | olive 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 |
| Agoseris retrorsa | CNPS-EB: A2 | spear-leaved agoseris | |
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | |
| Allophyllum gilioides subsp. gilioides | CNPS-EB: A2 | straggling gilia | |
| Anemopsis californica | CNPS-EB: B | yerba mansa, lizard tail | |
| Aphyllon tuberosum | CNPS-EB: C | bulbous broom-rape | |
| Aphyllon vallicola | CNPS-EB: B | California broom-rape | |
| Apocynum cannabinum | CNPS-EB: B | dogbane, Indian-hemp | |
| Aquilegia eximia | (A. formosa is more common) | CNPS-EB: A2 | Van Houtte's columbine |
| Arctostaphylos manzanita subsp. laevigata | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Contra Costa manzanita | |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | |
| Camissoniopsis intermedia | CNPS-EB: C | small primrose | |
| Clarkia biloba subsp. biloba | CNPS-EB: A2 | lobed godetia | |
| Clarkia purpurea subsp. viminea | (ssp. quadrivulnera more common | CNPS-EB: A1 | large godetia |
| Clematis ligusticifolia | CNPS-EB: C | western virgin's bower, virgin's bower | |
| Collinsia sparsiflora var. unknown | CNPS-EB: C? | few-flowered blue-eyed Mary | |
| Cornus glabrata | CNPS-EB: A1 | brown dogwood | |
| Cryptantha juniperensis | (formerly C. nevadensis var. rigida) | CNPS-EB: A1 | Nevada cryptantha |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | |
| Datisca glomerata | CNPS-EB: C | durango root | |
| Delphinium hesperium subsp. hesperium | CNPS-EB: B | western larkspur | |
| Delphinium nudicaule | CNPS-EB: C | red larkspur, orange larkspur | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Elymus trachycaulus subsp. trachycaulus | CNPS-EB: A1 | slender wheat grass | |
| Epipactis gigantea | CNPS-EB: A1 | stream orchid | |
| Equisetum laevigatum | CNPS-EB: A2 | smooth scouring rush | |
| Ericameria arborescens | CNPS-EB: B | golden-fleece | |
| Erigeron philadelphicus var. philadelphicus | CNPS-EB: C | fleabane | |
| Erythranthe nasuta | CNPS-EB: B | shy monkeyflower | |
| Festuca californica | CNPS-EB: C | California fescue | |
| Festuca elmeri | CNPS-EB: A1 | Elmer's fescue | |
| Galium andrewsii subsp. gatense | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5T3 CNDDB Rank: S3 | phlox-leaf serpentine bedstraw, serpentine bedstraw | |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Glycyrrhiza lepidota | CNPS-EB: C | wild licorice | |
| Hypericum scouleri | CNPS-EB: A1x | Scouler's st. john's wort, Scouler's St. John's wort | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Juniperus californica | CNPS-EB: C | California juniper | |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Lasthenia glabrata subsp. glabrata | CNPS-EB: A2 | yellow-ray goldfields | |
| Lasthenia minor | CNPS-EB: A1 | coastal goldfields, woolly goldfields | |
| Layia hieracioides | CNPS-EB: C | tall layia | |
| Lepechinia calycina | CNPS-EB: C | pitcher sage | |
| Leptosiphon androsaceus | (formerly Linanthus a.) | CNPS-EB: C | common linanthus, common leptosiphon |
| Leptosiphon ciliatus | (formerly Linanthus c.) | CNPS-EB: C | whisker brush |
| Leptosiphon pygmaeus subsp. continentalis | (formerly Linanthus p. ssp. c. | CNPS-EB: B | pygmy linanthus, pygmy leptosiphon |
| Lilium pardalinum subsp. pardalinum | CNPS-EB: A1 | leopard lily | |
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | |
| Lupinus pachylobus | CNPS-EB: B | big pod lupine | |
| Lythrum californicum | CNPS-EB: B | California loosestrife | |
| Malacothrix clevelandii | CNPS-EB: A2 | Cleveland's malacothrix | |
| Microseris douglasii subsp. tenella | (subsp douglasii is more common) | CNPS-EB: A2 | silver puffs |
| Microseris elegans | CNPS-EB: A1 | elegant microseris | |
| Navarretia mellita | CNPS-EB: C | honey-scented navarretia | |
| Navarretia pubescens | CNPS-EB: C | downy navarretia | |
| Nemophila pedunculata | CNPS-EB: B | meadow nemophila | |
| Nicotiana quadrivalvis | CNPS-EB: B | indian tobacco | |
| Packera breweri | (formerly Senecio b.) | CNPS-EB: C | Brewer's ragwort, Brewer's butterweed |
| Panicum capillare | CNPS-EB: A2 | witch grass | |
| Penstemon heterophyllus var. heterophyllus | CNPS-EB: B | chaparral penstemon | |
| Pentachaeta alsinoides | CNPS-EB: C | tiny pentachaeta | |
| Pentachaeta exilis subsp. exilis | CNPS-EB: A1 | meager pentachaeta | |
| Perideridia californica | CNPS-EB: C | California yampah | |
| Perideridia oregana | CNPS-EB: A2 | yampah | |
| Phacelia divaricata | CNPS-EB: B | divaricate phacelia | |
| Piperia elegans subsp. elegans | CNPS-EB: C | coast piperia, elegant piperia | |
| Pluchea odorata var. odorata | CNPS-EB: B | saltmarsh fleabane | |
| Prunus ilicifolia subsp. ilicifolia | CNPS-EB: B | islay, holly-leafed cherry | |
| Prunus subcordata | CNPS-EB: C | Pacific plum, Sierra plum | |
| Psilocarphus brevissimus var. brevissimus | CNPS-EB: B | dwarf woollyheads, dwarf woolly-marbles | |
| Quercus berberidifolia | CNPS-EB: C | scrub oak | |
| Quercus durata var. durata | CNPS-EB: B | leather oak | |
| Quercus wislizeni var. frutescens | CNPS-EB: C | shrubby interior live oak | |
| Ranunculus canus var. canus | CNPS-EB: C | Sacramento Valley buttercup | |
| Ribes malvaceum var. malvaceum | CNPS-EB: C | chaparral currant | |
| Rigiopappus leptocladus | CNPS-EB: C | rigiopappus | |
| Rumex salicifolius | (formerly R. salicifolius var. salicifolius) | CNPS-EB: B | willow dock |
| Rumex salicifolius var. unknown | CNPS-EB: A2? | willow dock | |
| Sagina decumbens subsp. occidentalis | (S. apetala is more common) | CNPS-EB: B | western pearlwort |
| Salvia spathacea | CNPS-EB: A1 | California hummingbird sage, hummingbird sage | |
| Scutellaria tuberosa | CNPS-EB: C | Dannie's skullcap | |
| Sedum spathulifolium | CNPS-EB: B | broadleaf stonecrop, Pacific stonecrop | |
| Stipa cernua | CNPS-EB: C | nodding needlegrass | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Streptanthus hispidus | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo jewelflower | |
| Stuckenia filiformis subsp. alpina | (formerly Potamogeton f.) | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G5T5 CNDDB Rank: S2S3 | slender-leaved potamogeton |
| Symphyotrichum lanceolatum var. hesperium | (formerly Aster lanceolatus ss | CNPS-EB: A2 | marsh aster |
| Symphyotrichum subulatum var. parviflorum | (formerly Aster subulatus var. | CNPS-EB: B | slim aster |
| Thysanocarpus laciniatus | CNPS-EB: B | lacepod | |
| Trifolium fucatum | CNPS-EB: B | bull clover | |
| Trifolium obtusiflorum | CNPS-EB: B | clammy clover, creek clover | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Trifolium wormskioldii | CNPS-EB: A1 | cow clover | |
| Tropidocarpum gracile | CNPS-EB: B | slender tropidocarpum | |
| Viola purpurea subsp. quercetorum | CNPS-EB: C | mountain violet |