| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Agoseris heterophylla var. cryptopleura | CNPS-EB: B | ||
| Agoseris heterophylla var. heterophylla | CNPS-EB: C | ||
| Amaranthus blitoides | CNPS-EB: C | procumbent pigweed, prostrate amaranth | |
| 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 tessellata var. tessellata | CNPS-EB: A1 | desert fiddleneck, devil's lettuce | |
| Anemopsis californica | CNPS-EB: B | yerba mansa, lizard tail | |
| Arctostaphylos auriculata | CNPS-EB: *A2 State CNPS: 1B.3 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo manzanita | |
| Arctostaphylos manzanita subsp. manzanita | CNPS-EB: A2 | common manzanita | |
| Astragalus asymmetricus | CNPS-EB: C | San Joaquin locoweeed | |
| Atriplex coronata var. coronata | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4T3 CNDDB Rank: S3 | crownscale | |
| Balsamorhiza deltoidea | CNPS-EB: B | deltoid balsamroot | |
| Blennosperma nanum var. nanum | CNPS-EB: C | blennosperma | |
| Blepharizonia laxa | (formerly B. plumosa ssp. visc | CNPS-EB: B | big tarplant |
| Blepharizonia plumosa | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1G2 CNDDB Rank: S1S2 | big tarplant | |
| Brodiaea terrestris subsp. terrestris | CNPS-EB: B | dwarf brodiaea | |
| California macrophylla | (formerly Erodium macrophyllum | CNPS-EB: B | round-leaved filaree |
| Calochortus pulchellus | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Mount Diablo fairy-lantern | |
| Camissonia contorta | CNPS-EB: C | contorted primrose | |
| Castilleja rubicundula subsp. lithospermoides | CNPS-EB: B | cream sacs | |
| Caulanthus flavescens | CNPS-EB: A2 | yellow-flowered thelypodium | |
| Cirsium cymosum var. cymosum | CNPS-EB: C | peregrine thistle | |
| Clarkia gracilis subsp. gracilis | CNPS-EB: C | summer's darling | |
| Clarkia modesta | CNPS-EB: A2 | modest clarkia | |
| Deinandra lobbii | (formerly Hemizonia l.) | CNPS-EB: C | three-rayed tarweed |
| Delphinium californicum subsp. interius | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G3T3 CNDDB Rank: S3 | Hospital Canyon larkspur | |
| Delphinium hansenii subsp. hansenii | CNPS-EB: A2 | Hansen's larkspur | |
| Delphinium hesperium subsp. hesperium | CNPS-EB: B | western larkspur | |
| Dendromecon rigida | CNPS-EB: A2 | bush poppy | |
| Eriogonum angulosum | CNPS-EB: B | angle-stem wild buckwheat, angle-stemmed eriogonum | |
| 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 | |
| Eriophyllum jepsonii | CNPS-EB: *A2 State CNPS: 4.3 Global Rank: G3 CNDDB Rank: S3 | Jepson's woolly sunflower | |
| 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 | |
| Forestiera pubescens | CNPS-EB: B | desert olive | |
| Galium andrewsii subsp. gatense | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G5T3 CNDDB Rank: S3 | phlox-leaf serpentine bedstraw, serpentine bedstraw | |
| Gilia capitata subsp. staminea | CNPS-EB: C | blue field gilia | |
| Glycyrrhiza lepidota | CNPS-EB: C | wild licorice | |
| Gutierrezia californica | CNPS-EB: C | California matchweed | |
| Hesperolinon breweri | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Brewer's western flax | |
| Lasthenia glabrata subsp. glabrata | CNPS-EB: A2 | yellow-ray goldfields | |
| Lasthenia microglossa | CNPS-EB: A2 | small-ray goldfields | |
| Lepechinia calycina | CNPS-EB: C | pitcher sage | |
| Lepidium latipes | CNPS-EB: B | dwarf peppergrass | |
| Leptosiphon ciliatus | (formerly Linanthus c.) | CNPS-EB: C | whisker brush |
| Lithophragma bolanderi | CNPS-EB: A1 | Bolander starflower | |
| Lomatium caruifolium var. caruifolium | CNPS-EB: B | caraway-leaved lomatium | |
| Lupinus concinnus | CNPS-EB: A1 | Bajada lupine | |
| Lythrum californicum | CNPS-EB: B | California loosestrife | |
| Malacothamnus fremontii var. fremontii | CNPS-EB: C | white-coat mallow | |
| Mentzelia affinis | CNPS-EB: B | hydra stick-leaf | |
| Microseris sylvatica | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G4 CNDDB Rank: S4 | sylvan microseris | |
| Monolopia major | CNPS-EB: B | cupped monolopia | |
| Navarretia atractyloides | CNPS-EB: A2 | holly-leaved navarretia | |
| Navarretia gowenii | CNPS-EB: *A2 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Lime Ridge navarretia | |
| Navarretia pubescens | CNPS-EB: C | downy navarretia | |
| Nuttallanthus texanus | CNPS-EB: A2 | blue toadflax | |
| Parietaria hespera var. californica | CNPS-EB: A1 | California pellitory | |
| Penstemon centranthifolius | CNPS-EB: B | scarlet bugler | |
| Phacelia ciliata | CNPS-EB: B | Great Valley phacelia, Great Valley phacelia | |
| Phacelia tanacetifolia | CNPS-EB: B | tansy phacelia | |
| Phoradendron leucarpum subsp. macrophyllum | (formerly P. serotinum subsp. macrophyllum, P. macrophyllum) | CNPS-EB: C | big leaf mistletoe |
| Pinus coulteri | CNPS-EB: B | Coulter pine | |
| Piperia elongata | CNPS-EB: C | chaparral orchid, wood rein-orchid, elongate piperia | |
| Piperia michaelii | CNPS-EB: *A2 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | Michael's rein-orchid | |
| Plagiobothrys acanthocarpus | CNPS-EB: B | adobe popcornflower, adobe allocarya | |
| Plagiobothrys fulvus var. campestris | CNPS-EB: B | field popcornflower, fulvous popcornflower | |
| Plagiobothrys trachycarpus | CNPS-EB: C | rough-nutlet popcornflower, rough-fruited allocarya | |
| Sagittaria montevidensis subsp. calycina | CNPS-EB: A1 | ||
| Sanicula laciniata | CNPS-EB: A2 | coast sanicle | |
| Trifolium oliganthum | CNPS-EB: C | few-flowered clover | |
| Tropidocarpum gracile | CNPS-EB: B | slender tropidocarpum | |
| Vicia hassei | CNPS-EB: A2 | slender vetch | |
| Agoseris retrorsa | CNPS-EB: A2 | spear-leaved agoseris | |
| Amaranthus californicus | CNPS-EB: B | Californian amaranth | |
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | |
| Ancistrocarphus filagineus | CNPS-EB: C | woolly fishhooks | |
| Aphyllon californicum subsp. jepsonii | CNPS-EB: A1 | Jepson broom-rape | |
| Aphyllon tuberosum | CNPS-EB: C | bulbous broom-rape | |
| Arctostaphylos glauca | CNPS-EB: C | big-berried manzanita | |
| Arctostaphylos manzanita subsp. laevigata | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G5T2 CNDDB Rank: S2 | Contra Costa manzanita | |
| Argemone munita | CNPS-EB: A1 | chicalote, prickly poppy | |
| Arnica discoidea | CNPS-EB: B | rayless arnica | |
| Arthrocnemum subterminale | CNPS-EB: A2 | Parish's glasswort | |
| Atriplex serenana var. serenana | CNPS-EB: A1 | bractscale | |
| Bolboschoenus maritimus subsp. paludosus | (formerly Scirpus m.) | CNPS-EB: C | bulrush |
| Camissoniopsis micrantha | CNPS-EB: C | small primrose | |
| Chaenactis glabriuscula var. glabriuscula | CNPS-EB: A1 | yellow pincushion | |
| Clarkia concinna subsp. concinna | CNPS-EB: C | large godetia | |
| Claytonia exigua subsp. exigua | CNPS-EB: C | common montia | |
| Crocanthemum scoparium var. vulgare | (formerly Helianthemum scoparium var. vulgare) | CNPS-EB: B | peak rush-rose |
| Delphinium variegatum subsp. variegatum | CNPS-EB: C | royal larkspur | |
| Downingia ornatissima var. mirabilis | (historical-1956; formerly D. ornatissima var. eximia) | CNPS-EB: A1x | Solano downingia |
| Dudleya cymosa subsp. paniculata | CNPS-EB: B | spreading dudleya | |
| Ehrendorferia chrysantha | (formerly Dicentra chrysantha) | CNPS-EB: B | golden ear-drops |
| Elymus elymoides var. elymoides | CNPS-EB: B | squirreltail | |
| Elymus multisetus | CNPS-EB: C | big squirreltail | |
| Ericameria arborescens | CNPS-EB: B | golden-fleece | |
| Eriophyllum lanatum var. achilleoides | CNPS-EB: C | woolly sunflower | |
| Eryngium jepsonii | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | ||
| Festuca californica | CNPS-EB: C | California fescue | |
| Fraxinus dipetala | CNPS-EB: B | California ash, flowering ash | |
| Helianthella castanea | CNPS-EB: *A2 State CNPS: 1B.2 Global Rank: G2 CNDDB Rank: S2 | Diablo helianthella | |
| Heterotheca sessiliflora subsp. bolanderi | (H. s. ssp. echioides is more | CNPS-EB: C | Bolander goldenaster |
| Hordeum brachyantherum subsp. californicum | (ssp. brachyantherum is more common | CNPS-EB: A2 | California barley |
| Koeleria macrantha | CNPS-EB: C | june grass | |
| Lasthenia minor | CNPS-EB: A1 | coastal goldfields, woolly goldfields | |
| Lathyrus jepsonii var. californicus | CNPS-EB: B | buff pea | |
| Layia glandulosa | (historical-1983 but not seen | CNPS-EB: A1x | white layia |
| Layia platyglossa | CNPS-EB: B | tidy-tips | |
| Madia exigua | CNPS-EB: C | ||
| Marah oregana | CNPS-EB: B | coast man-root | |
| Melica californica | CNPS-EB: C | California melic | |
| Mentzelia dispersa | CNPS-EB: A2 | Nada stick-leaf | |
| Microseris elegans | CNPS-EB: A1 | elegant microseris | |
| Pediomelum californicum | CNPS-EB: A2 | indian breadroot | |
| Pentachaeta alsinoides | CNPS-EB: C | tiny pentachaeta | |
| Pentachaeta exilis subsp. exilis | CNPS-EB: A1 | meager pentachaeta | |
| Phacelia breweri | CNPS-EB: B | Brewer's phacelia | |
| Phacelia divaricata | CNPS-EB: B | divaricate phacelia | |
| Pickeringia montana var. montana | CNPS-EB: C | chaparral pea | |
| Piperia unalascensis | CNPS-EB: A1 | Alaska piperia, slender-spire orchid | |
| Plagiobothrys canescens var. canescens | CNPS-EB: C | valley popcornflower | |
| Quercus agrifolia x wislizeni | CNPS-EB: A1 | coast live oak x interior live oak | |
| Quercus lobata | CNPS-EB: B | valley oak, roble | |
| Quercus wislizeni var. frutescens | CNPS-EB: C | shrubby interior live oak | |
| Quercus xchasei | CNPS-EB: B | Chase oak | |
| Ranunculus canus var. canus | CNPS-EB: C | Sacramento Valley buttercup | |
| Ranunculus occidentalis var. occidentalis | CNPS-EB: B | western buttercup | |
| Rhus aromatica | (formerly R. trilobata) | CNPS-EB: C | skunk bush, skunkbrush, squawbush |
| Ribes malvaceum var. malvaceum | CNPS-EB: C | chaparral currant | |
| Scutellaria tuberosa | CNPS-EB: C | Dannie's skullcap | |
| Senecio aphanactis | CNPS-EB: *A1x State CNPS: 2B.2 Global Rank: G3 CNDDB Rank: S2 | chaparral ragwort, rayless ragwort | |
| Stachys bullata | CNPS-EB: A1? | California hedge nettle | |
| Stellaria nitens | CNPS-EB: C | shining chickweed | |
| Stipa cernua | CNPS-EB: C | nodding needlegrass | |
| Stipa lepida | CNPS-EB: C | foothill needlegrass | |
| Stipa pulchra | CNPS-EB: C | purple needlegrass | |
| Thysanocarpus radians | CNPS-EB: A1 | ribbed fringe pod | |
| Wyethia glabra | (W. helenioides is more common | CNPS-EB: C | mule ears |
| Zeltnera davyi | (formerly Centaurium d.) | CNPS-EB: B | Davy's centaury, conchalagua |