| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Agoseris heterophylla var. cryptopleura | CNPS-EB: B | ||
| Agoseris heterophylla var. heterophylla | CNPS-EB: C | ||
| Agrostis hallii | CNPS-EB: A2 | Hall's bent grass | |
| Alisma triviale | (formerly A. plantago-aquatica | CNPS-EB: C | water plantain |
| Amaranthus blitoides | CNPS-EB: C | procumbent pigweed, prostrate amaranth | |
| Amsinckia lunaris | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | bent-flowered fiddleneck | |
| Aphyllon epigalium subsp. epigalium | CNPS-EB: A1 | ||
| Aphyllon vallicola | CNPS-EB: B | California broom-rape | |
| Asclepias speciosa | (A. californica is more common | CNPS-EB: B | showy milkweed, milkweed |
| Bolboschoenus maritimus subsp. paludosus | (formerly Scirpus m.) | CNPS-EB: C | bulrush |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Cicuta douglasii | CNPS-EB: A2 | water-hemlock | |
| Cirsium cymosum var. cymosum | CNPS-EB: C | peregrine thistle | |
| Clarkia biloba subsp. biloba | CNPS-EB: A2 | lobed godetia | |
| Claytonia exigua subsp. exigua | CNPS-EB: C | common montia | |
| Collinsia sparsiflora var. sparsiflora | CNPS-EB: C | few-flowered blue-eyed Mary | |
| Cordylanthus pilosus subsp. pilosus | CNPS-EB: B | hairy bird's-beak | |
| Cornus sericea subsp. unknown | CNPS-EB: C? | American dogwood | |
| Cuscuta campestris | CNPS-EB: A1 | field dodder | |
| Cuscuta subinclusa | CNPS-EB: C | canyon dodder | |
| Delphinium nudicaule | CNPS-EB: C | red larkspur, orange larkspur | |
| Dudleya cymosa subsp. cymosa | (ssp. paniculata is more common) | CNPS-EB: A1x | spreading dudleya |
| Epilobium campestre | CNPS-EB: B | smooth boisduvalia | |
| Eriogonum roseum | CNPS-EB: A2 | wand wild buckwheat, virgate buckwheat | |
| Eryngium jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | ||
| Eschscholzia caespitosa | CNPS-EB: A1 | tufted poppy | |
| Festuca californica | CNPS-EB: C | California fescue | |
| Festuca octoflora | CNPS-EB: A2 | sixweeks grass, slender fescue | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Hieracium albiflorum | CNPS-EB: C | white hawkweed | |
| Horkelia californica var. frondosa | CNPS-EB: B | leafy horkelia | |
| Juncus phaeocephalus var. paniculatus | CNPS-EB: B | panicled rush, brown-headed rush | |
| Lasthenia glaberrima | CNPS-EB: B | smooth goldfields | |
| Leptosiphon pygmaeus subsp. continentalis | (formerly Linanthus p. ssp. c. | CNPS-EB: B | pygmy linanthus, pygmy leptosiphon |
| Madia exigua | CNPS-EB: C | ||
| Malacothrix floccifera | CNPS-EB: C | woolly malacothrix | |
| Morella californica | (formerly Myrica c.) | CNPS-EB: B | wax myrtle |
| Packera breweri | (formerly Senecio b.) | CNPS-EB: C | Brewer's ragwort, Brewer's butterweed |
| Pentachaeta alsinoides | CNPS-EB: C | tiny pentachaeta | |
| Persicaria hydropiperoides | (formerly Polygonum h.) | CNPS-EB: A2 | false waterpepper, water-pepper |
| Phacelia ramosissima | CNPS-EB: B | branching phacelia | |
| 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 undulatus | CNPS-EB: A2 | wavy-stemmed popcornflower, coast allocarya | |
| Platanus racemosa | CNPS-EB: C | western sycamore, California sycamore | |
| Poa howellii | CNPS-EB: A2 | Howell's bluegrass | |
| Prunus emarginata | CNPS-EB: C | bitter cherry | |
| Quercus garryana var. garryana | CNPS-EB: B | Oregon oak | |
| Quercus xchasei | CNPS-EB: B | Chase oak | |
| Ranunculus lobbii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S3 | Lobb's aquatic buttercup | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: C | skunk bush, skunkbrush, squawbush |
| Rorippa curvisiliqua | CNPS-EB: B | yellow cress | |
| Rorippa palustris subsp. palustris | CNPS-EB: B | marsh yellow-cress | |
| Rosa spithamea | CNPS-EB: C | coast ground rose, ground rose | |
| Scutellaria tuberosa | CNPS-EB: C | Dannie's skullcap | |
| Senecio aronicoides | CNPS-EB: C | rayless ragwort, California butterweed | |
| Stellaria nitens | CNPS-EB: C | shining chickweed | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stylocline gnaphaloides | CNPS-EB: B | everlasting neststraw, nest-straw | |
| Trifolium barbigerum | CNPS-EB: A2 | bearded clover | |
| Trifolium dichotomum | CNPS-EB: C | branched indian clover | |
| Trifolium obtusiflorum | CNPS-EB: B | clammy clover, creek clover | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Viburnum ellipticum | CNPS-EB: *A2 State CNPS: 2B.3 Global Rank: G4G5 CNDDB Rank: S3 | oval-leaved viburnum | |
| Wyethia glabra | (W. helenioides is more common | CNPS-EB: C | mule ears |
| Amelanchier utahensis | CNPS-EB: C | Utah service-berry | |
| Amsinckia tessellata var. tessellata | CNPS-EB: A1 | desert fiddleneck, devil's lettuce | |
| Arbutus menziesii | CNPS-EB: B | Pacific madrone | |
| Brickellia californica | CNPS-EB: C | California brickellbush, California brickellia | |
| Calamagrostis rubescens | CNPS-EB: B | pine reed grass, pine grass | |
| Carex barbarae | CNPS-EB: C | whiteroot sedge, Santa Barbara sedge, St. Barbara's sedge | |
| Clarkia gracilis subsp. gracilis | CNPS-EB: C | summer's darling | |
| 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 | |
| Cornus sericea subsp. occidentalis | CNPS-EB: C | western dogwood | |
| Cornus sericea subsp. sericea | CNPS-EB: C | American dogwood | |
| Dendromecon rigida | CNPS-EB: A2 | bush poppy | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Equisetum laevigatum | CNPS-EB: A2 | smooth scouring rush | |
| Frangula californica subsp. tomentella | (formerly Rhamnus t.) | CNPS-EB: B | hoary coffeeberry |
| Garrya elliptica | CNPS-EB: B | silk tassel bush | |
| Hemizonia congesta subsp. lutescens | CNPS-EB: B | hayfield tarweed | |
| Hesperevax acaulis var. ambusticola | (H. sparsiflora is more common | CNPS-EB: A1x | fire evax |
| Juncus phaeocephalus var. phaeocephalus | CNPS-EB: B | brownheaded rush | |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Layia platyglossa | CNPS-EB: B | tidy-tips | |
| Lepidium latipes | CNPS-EB: B | dwarf peppergrass | |
| Lepidium oxycarpum | CNPS-EB: A2 | sharp-podded pepper-grass | |
| Lupinus pachylobus | CNPS-EB: B | big pod lupine | |
| Microseris elegans | CNPS-EB: A1 | elegant microseris | |
| Navarretia mellita | CNPS-EB: C | honey-scented navarretia | |
| Papaver californicum | CNPS-EB: B | fire poppy | |
| Piperia elegans subsp. elegans | CNPS-EB: C | coast piperia, elegant piperia | |
| Plagiobothrys acanthocarpus | CNPS-EB: B | adobe popcornflower, adobe allocarya | |
| Prunus subcordata | CNPS-EB: C | Pacific plum, Sierra plum | |
| Quercus berberidifolia | CNPS-EB: C | scrub oak | |
| Quercus lobata | CNPS-EB: B | valley oak, roble | |
| Quercus xjolonensis | CNPS-EB: A1? | blue oak x valley oak | |
| Ribes divaricatum var. pubiflorum | CNPS-EB: C | straggle bush, straggly gooseberry | |
| Ribes malvaceum var. malvaceum | CNPS-EB: C | chaparral currant | |
| Stebbinsoseris heterocarpa | CNPS-EB: C | grassland silverpuffs, derived microseris | |
| Trianthema portulacastrum | CNPS-EB: A1x | horse purslane | |
| Turritis glabra | CNPS-EB: B | tower mustard |