| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Setaria parviflora | CNPS-EB: B | knotroot bristle grass, perennial foxtail | |
| Acmispon strigosus | CNPS-EB: B | strigose trefoil | |
| Allenrolfea occidentalis | CNPS-EB: C | iodine bush | |
| Allium peninsulare var. peninsulare | (historical-1954) | CNPS-EB: A1x | peninsular onion |
| Ammannia coccinea | CNPS-EB: A1 | long-leaved ammannia | |
| Amsinckia grandiflora | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | large-flowered fiddleneck | |
| Amsinckia lycopsoides | CNPS-EB: C | bugloss-flowered fiddleneck, bugloss fiddleneck | |
| Amsinckia tessellata var. gloriosa | CNPS-EB: A1 | carrizo fiddleneck, tessellate fiddleneck | |
| Ancistrocarphus filagineus | CNPS-EB: C | woolly fishhooks | |
| Aphyllon californicum subsp. jepsonii | CNPS-EB: A1 | Jepson broom-rape | |
| Arctostaphylos manzanita subsp. laevigata | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Contra Costa manzanita | |
| Arctostaphylos manzanita subsp. manzanita | CNPS-EB: A2 | common manzanita | |
| Astragalus asymmetricus | CNPS-EB: C | San Joaquin locoweeed | |
| Astragalus didymocarpus var. didymocarpus | (A. gambelianus is more common | CNPS-EB: A1 | two-seeded milkvetch |
| Athysanus unilateralis | (formerly Heterodraba unilateralis) | CNPS-EB: A1 | heterodraba |
| Atriplex argentea var. expansa | CNPS-EB: B | silverscale | |
| Balsamorhiza deltoidea | CNPS-EB: B | deltoid balsamroot | |
| Bidens laevis | CNPS-EB: A2 | bur-marigold | |
| Blennosperma nanum var. nanum | CNPS-EB: C | blennosperma | |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1G2 CNDDB Rank: S1S2 | big tarplant | |
| Bolboschoenus fluviatilis | (formerly Scirpus f.) | CNPS-EB: A1x | river bulrush |
| California macrophylla | (formerly Erodium macrophyllum | CNPS-EB: B | round-leaved filaree |
| Calycadenia multiglandulosa | CNPS-EB: A2 | sticky calycadenia | |
| Camissonia campestris subsp. campestris | (historical-1940) | CNPS-EB: A1x | Mojave suncup |
| Camissonia contorta | CNPS-EB: C | contorted primrose | |
| Camissonia strigulosa | CNPS-EB: A1 | contorted primrose | |
| Camissoniopsis micrantha | CNPS-EB: C | small primrose | |
| Caulanthus flavescens | CNPS-EB: A2 | yellow-flowered thelypodium | |
| Cephalanthus occidentalis | CNPS-EB: A2 | button bush | |
| Chaenactis glabriuscula var. glabriuscula | CNPS-EB: A1 | yellow pincushion | |
| Chaenactis glabriuscula var. megacephala | CNPS-EB: A1 | yellow pincushion | |
| Chorizanthe polygonoides var. polygonoides | CNPS-EB: A1 | knotweed spineflower | |
| Clarkia epilobioides | CNPS-EB: A1 | ||
| Collinsia bartsiifolia var. bartsiifolia | CNPS-EB: A1x | white Chinese houses | |
| Croton californicus | CNPS-EB: A2 | California croton | |
| Cryptantha hooveri | (historical-1908) | CNPS-EB: *A1x State CNPS: 1A Global Rank: GH CNDDB Rank: SH | Hoover's cryptantha |
| Cryptantha micromeres | CNPS-EB: A2 | minute-flowered cryptantha | |
| Cryptantha microstachys | CNPS-EB: A2 | Tejon cryptantha | |
| Deinandra kelloggii | (formerly Hemizonia k.) | CNPS-EB: A2 | Kellogg's tarweed |
| Delphinium parryi subsp. parryi | CNPS-EB: A2 | Parry's larkspur | |
| Delphinium variegatum subsp. variegatum | CNPS-EB: C | royal larkspur | |
| Descurainia pinnata subsp. brachycarpa | CNPS-EB: A1x | tansy mustard | |
| Downingia ornatissima var. mirabilis | (historical-1956; formerly D. ornatissima var. eximia) | CNPS-EB: A1x | Solano downingia |
| Elatine californica | CNPS-EB: A2 | waterwort | |
| Epilobium cleistogamum | CNPS-EB: A1 | cleistogamous boisduvalia | |
| Eriastrum pluriflorum subsp. pluriflorum | CNPS-EB: A1 | many-flowered eriastrum | |
| Erigeron philadelphicus var. philadelphicus | CNPS-EB: C | fleabane | |
| Eriogonum roseum | CNPS-EB: A2 | wand wild buckwheat, virgate buckwheat | |
| Eriogonum truncatum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Mount Diablo buckwheat | |
| Erythranthe latidens | (formerly Mimulus latidens) | CNPS-EB: A1 | broad-toothed monkeyflower |
| Eschscholzia rhombipetala | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | diamond-petaled California poppy | |
| Extriplex joaquinana | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | San Joaquin spearscale, San Joaquin saltbush | |
| Fritillaria agrestis | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | stinkbells | |
| Gilia capitata subsp. staminea | CNPS-EB: C | blue field gilia | |
| Glyceria leptostachya | CNPS-EB: A1 | narrow manna grass, Davy's mannagrass | |
| Glycyrrhiza lepidota | CNPS-EB: C | wild licorice | |
| Hesperevax caulescens | (H. sparsiflora is more common | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | hogwallow starfish |
| Hesperolinon breweri | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Brewer's western flax | |
| Hesperomecon linearis | (formerly Meconella l.) (hist | CNPS-EB: A1x | narrow-leaved meconella |
| Heterotheca sessiliflora subsp. bolanderi | (H. s. ssp. echioides is more | CNPS-EB: C | Bolander goldenaster |
| Hydrocotyle verticillata | CNPS-EB: B | whorled marsh pennywort | |
| Isoetes howellii | CNPS-EB: A1 | Howell's quillwort | |
| Juncus bufonius var. occidentalis | (historical-1895) (vars. bufon | CNPS-EB: A1x | western toad rush, toad rush |
| Juncus phaeocephalus var. phaeocephalus | CNPS-EB: B | brownheaded rush | |
| Laennecia coulteri | (formerly Conyza c.) | CNPS-EB: A1 | Coulter's horseweed, Coulter's conyza |
| Lastarriaea coriacea | CNPS-EB: A2 | leather-spineflower, lastarriaea | |
| Lasthenia conjugens | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 FESA Status: FE | Contra Costa goldfields | |
| Lasthenia fremontii | CNPS-EB: A1 | Fremont's goldfields | |
| Lasthenia glaberrima | CNPS-EB: B | smooth goldfields | |
| Lasthenia glabrata subsp. glabrata | CNPS-EB: A2 | yellow-ray goldfields | |
| Lasthenia minor | CNPS-EB: A1 | coastal goldfields, woolly goldfields | |
| Layia chrysanthemoides | CNPS-EB: A2 | smooth layia | |
| Layia glandulosa | (historical-1983 but not seen | CNPS-EB: A1x | white layia |
| Lepidium acutidens | CNPS-EB: C | sharp-toothed pepper-grass | |
| 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 |
| Lessingia nemaclada | CNPS-EB: A2 | slender-stemmed lessignia | |
| Lessingia pectinata var. tenuipes | CNPS-EB: A2 | valley lessingia | |
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | |
| Lithophragma cymbalaria | (historical-1895) | CNPS-EB: A1x | mission star |
| Lupinus affinis | CNPS-EB: A1 | lupine | |
| Lupinus chamissonis | (historical-1963) | CNPS-EB: A1x | Chamisso's bush lupine |
| Madia radiata | (historical-1941) | CNPS-EB: *A1x State CNPS: 1B.1 Global Rank: G3 CNDDB Rank: S3 | showy golden madia, showy madia |
| Malacothamnus fremontii var. fremontii | CNPS-EB: C | white-coat mallow | |
| Malacothrix californica | (historical-1895) | CNPS-EB: A1x | California malacothrix |
| Malacothrix clevelandii | CNPS-EB: A2 | Cleveland's malacothrix | |
| Malacothrix coulteri | CNPS-EB: A1 | snake's-head | |
| Malacothrix floccifera | CNPS-EB: C | woolly malacothrix | |
| Melica californica | CNPS-EB: C | California melic | |
| Mentha canadensis | CNPS-EB: B | American cornmint, Japanese peppermint | |
| Micropus californicus var. subvestitus | (var. californicus is more common) | CNPS-EB: A2 | slender cottonweed |
| Microseris douglasii subsp. tenella | (subsp douglasii is more common) | CNPS-EB: A2 | silver puffs |
| Microseris sylvatica | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | sylvan microseris | |
| Monolopia major | CNPS-EB: B | cupped monolopia | |
| Myosurus minimus subsp. apus | CNPS-EB: *A1? State CNPS: 3.1 Global Rank: G5T2Q CNDDB Rank: S2 | little mousetail | |
| Myosurus minimus subsp. minimus | CNPS-EB: C | common mouse-tail | |
| Myosurus sessilis | CNPS-EB: A1 | sessile mouse-tail | |
| Navarretia nigelliformis subsp. nigelliformis | CNPS-EB: *A2? State CNPS: 4.2 Global Rank: G4T3 CNDDB Rank: S3 | adobe navarretia | |
| Navarretia nigelliformis subsp. radians | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G4T2T3 CNDDB Rank: S2S3 | shining navarretia | |
| Navarretia viscidula | CNPS-EB: A2 | sticky navarretia | |
| Pectocarya penicillata | CNPS-EB: A2 | northern pectocarya, winged pectocarya | |
| Penstemon centranthifolius | CNPS-EB: B | scarlet bugler | |
| Phacelia ciliata | CNPS-EB: B | Great Valley phacelia, Great Valley phacelia | |
| Phacelia douglasii | CNPS-EB: A1 | Douglas' phacelia | |
| Phacelia ramosissima | CNPS-EB: B | branching phacelia | |
| Phacelia tanacetifolia | CNPS-EB: B | tansy phacelia | |
| Phalaris arundinacea | CNPS-EB: A1 | reed canary grass | |
| Pilularia americana | CNPS-EB: A1 | pillwort | |
| Plagiobothrys acanthocarpus | CNPS-EB: B | adobe popcornflower, adobe allocarya | |
| Plagiobothrys canescens var. canescens | CNPS-EB: C | valley popcornflower | |
| Plagiobothrys fulvus var. campestris | CNPS-EB: B | field popcornflower, fulvous popcornflower | |
| Plagiobothrys humistratus | CNPS-EB: A2 | low popcornflower, dwarf allocarya | |
| Plagiobothrys leptocladus | CNPS-EB: A1 | alkali plagiobothrys | |
| Plagiobothrys stipitatus var. stipitatus | (var. micranthus is more commo | CNPS-EB: C | showy great valley popcornflower, stipitate allocarya |
| Plagiobothrys tenellus | CNPS-EB: B | Pacific popcornflower, slender popcornflower | |
| Plagiobothrys trachycarpus | CNPS-EB: C | rough-nutlet popcornflower, rough-fruited allocarya | |
| Plantago elongata | CNPS-EB: B | annual coast plantain | |
| Pogogyne zizyphoroides | CNPS-EB: A2 | Sacramento beardstyle | |
| Psilocarphus brevissimus var. brevissimus | CNPS-EB: B | dwarf woollyheads, dwarf woolly-marbles | |
| Psilocarphus oregonus | CNPS-EB: A2 | Oregon woollyheads, Oregon woolly-marbles | |
| Salvia carduacea | (historical-1946) | CNPS-EB: A1x | thistle sage |
| Samolus parviflorus | CNPS-EB: A1 | seaside brookweed, water-pimpernel | |
| Senecio flaccidus var. douglasii | CNPS-EB: A2 | Douglas' threadleaf ragwort, shrubby butterweed | |
| Stachys albens | CNPS-EB: B | white hedge nettle | |
| Stebbinsoseris heterocarpa | CNPS-EB: C | grassland silverpuffs, derived microseris | |
| Stellaria nitens | CNPS-EB: C | shining chickweed | |
| Stephanomeria elata | CNPS-EB: A1 | stephanomeria | |
| Stylocline gnaphaloides | CNPS-EB: B | everlasting neststraw, nest-straw | |
| Symphyotrichum subulatum var. parviflorum | (formerly Aster subulatus var. | CNPS-EB: B | slim aster |
| Tetrapteron graciliflorum | CNPS-EB: C | hill sun cup | |
| Trifolium fucatum | CNPS-EB: B | bull clover | |
| Trifolium macraei | CNPS-EB: A1 | Macrae's clover, double-headed clover | |
| Trifolium olivaceum | CNPS-EB: C | olive clover | |
| Tropidocarpum gracile | CNPS-EB: B | slender tropidocarpum | |
| Verbena hastata | CNPS-EB: A1 | blue vervain |