| Acanthomintha lanceolata | Santa Clara thornmint | 4.2 ⓘ |
| Allium sharsmithiae | Sharsmith's onion | 1B.3 ⓘ |
| Amsinckia grandiflora | large-flowered fiddleneck | 1B.1 ⓘ |
| Amsinckia lunaris | bent-flower fiddleneck | 1B.2 ⓘ |
| Androsace elongata subsp. acuta | | 4.2 ⓘ |
| Arctostaphylos auriculata | Mt. Diablo manzanita | 1B.3 ⓘ |
| Arctostaphylos manzanita subsp. laevigata | Contra Costa manzanita | 1B.2 ⓘ |
| Arctostaphylos pallida | pallid manzanita | 1B.1 ⓘ |
| Astragalus tener var. tener | alkali milkvetch | 1B.2 ⓘ |
| Atriplex coronata var. coronata | crownscale | 4.2 ⓘ |
| Atriplex depressa | brittlescale | 1B.2 ⓘ |
| Atriplex minuscula | lesser saltscale | 1B.1 ⓘ |
| Balsamorhiza macrolepis | | 1B.2 ⓘ |
| Blepharizonia plumosa | big tarplant | 1B.1 ⓘ |
| Calandrinia breweri | | 4.2 ⓘ |
| Calochortus pulchellus | Mt. Diablo fairy lantern | 1B.2 ⓘ |
| Calochortus umbellatus | Oakland star-tulip | 4.2 ⓘ |
| Campanula exigua | chaparral harebell | 1B.2 ⓘ |
| Castilleja ambigua subsp. ambigua | johnny-nip | 4.2 ⓘ |
| Centromadia parryi subsp. congdonii | Congdon's tarplant | 1B.1 ⓘ |
| Chlorogalum pomeridianum var. minus | dwarf soaproot | 1B.2 ⓘ |
| Chloropyron molle subsp. hispidum | hispid bird's-beak | 1B.1 ⓘ |
| Chloropyron molle subsp. molle | soft bird's-beak | 1B.2 ⓘ |
| Chloropyron palmatum | palmate bird's-beak | 1B.1 ⓘ |
| Cicuta maculata var. bolanderi | water hemlock | 2B.1 ⓘ |
| Cirsium andrewsii | Franciscan thistle | 1B.2 ⓘ |
| Cirsium fontinale var. campylon | Hamilton thistle | 1B.2 ⓘ |
| Clarkia breweri | Brewer's clarkia | 4.2 ⓘ |
| Clarkia concinna subsp. automixa | Santa Clara red ribbons | 4.3 ⓘ |
| Clarkia franciscana | Presidio clarkia | 1B.1 ⓘ |
| Collomia diversifolia | serpentine collomia | 4.3 ⓘ |
| Convolvulus simulans | | 4.2 ⓘ |
| Cordylanthus nidularius | Mt. Diablo bird's-beak | 1B.1 ⓘ |
| Deinandra bacigalupii | Livermore moonshine | 1B.1 ⓘ |
| Delphinium californicum subsp. interius | California larkspur | 1B.2 ⓘ |
| Dirca occidentalis | western leatherwood | 1B.2 ⓘ |
| Eleocharis parvula | small spikerush | 4.3 ⓘ |
| Eriastrum ertterae | Lime Ridge eriastrum | 1B.1 ⓘ |
| Eriogonum luteolum var. caninum | Tiburon buckwheat | 1B.2 ⓘ |
| Eriogonum nudum var. psychicola | Antioch Dunes buckwheat | 1B.1 ⓘ |
| Eriogonum truncatum | Mt. Diablo buckwheat | 1B.1 ⓘ |
| Eriogonum umbellatum var. bahiiforme | sulfur flower | 4.2 ⓘ |
| Eriophyllum jepsonii | Jepson's woolly-sunflower | 4.3 ⓘ |
| Eryngium aristulatum var. hooveri | | 1B.1 ⓘ |
| Eryngium jepsonii | | 1B.2 ⓘ |
| Eryngium spinosepalum | | 1B.2 ⓘ |
| Erysimum capitatum var. angustatum | Contra Costa wallflower | 1B.1 ⓘ |
| Erythranthe inconspicua | small-flowered monkeyflower | 4.3 ⓘ |
| Eschscholzia rhombipetala | | 1B.1 ⓘ |
| Extriplex joaquinana | San Joaquin saltbush | 1B.2 ⓘ |
| Fritillaria agrestis | stinkbells | 4.2 ⓘ |
| Fritillaria falcata | talus fritillary | 1B.2 ⓘ |
| Fritillaria liliacea | fragrant fritillary | 1B.2 ⓘ |
| Galium andrewsii subsp. gatense | needle bedstraw | 4.2 ⓘ |
| Helianthella castanea | Diablo helianthella | 1B.2 ⓘ |
| Hesperevax caulescens | hogwallow starfish | 4.2 ⓘ |
| Hesperocyparis macrocarpa | Monterey cypress | 1B.2 ⓘ |
| Hesperolinon breweri | Brewer's dwarf flax | 1B.2 ⓘ |
| Hibiscus lasiocarpos var. occidentalis | rose-mallow | 1B.2 ⓘ |
| Holocarpha macradenia | Santa Cruz tarplant | 1B.1 ⓘ |
| Iris longipetala | central coast iris | 4.2 ⓘ |
| Juglans californica | Southern California black walnut | 4.2 ⓘ |
| Lasthenia conjugens | Contra Costa goldfields | 1B.1 ⓘ |
| Lasthenia ferrisiae | | 4.2 ⓘ |
| Lathyrus jepsonii var. jepsonii | delta tule pea | 1B.2 ⓘ |
| Legenere limosa | false Venus' looking glass | 1B.1 ⓘ |
| Leptosiphon ambiguus | serpentine linanthus | 4.2 ⓘ |
| Leptosiphon aureus | | 4.2 ⓘ |
| Leptosyne hamiltonii | Mt. Hamilton coreopsis | 1B.2 ⓘ |
| Lessingia tenuis | spring lessingia | 4.3 ⓘ |
| Lilaeopsis masonii | Mason's lilaeopsis | 1B.1 ⓘ |
| Limosella australis | delta mudwort | 2B.1 ⓘ |
| Malacothamnus arcuatus var. elmeri | | 1B.2 ⓘ |
| Meconella oregana | | 1B.1 ⓘ |
| Microseris sylvatica | | 4.2 ⓘ |
| Monolopia gracilens | | 1B.2 ⓘ |
| Myosurus minimus subsp. apus | little mousetail | 3.1 ⓘ |
| Navarretia cotulifolia | cotula navarretia | 4.2 ⓘ |
| Navarretia gowenii | Gowen's navarretia | 1B.1 ⓘ |
| Navarretia heterandra | Tehama navarretia | 4.3 ⓘ |
| Navarretia nigelliformis subsp. radians | adobe navarretia | 1B.2 ⓘ |
| Navarretia prostrata | | 1B.2 ⓘ |
| Oenothera deltoides subsp. howellii | Antioch Dunes evening-primrose | 1B.1 ⓘ |
| Phacelia phacelioides | Mt. Diablo phacelia | 1B.2 ⓘ |
| Pinus radiata | Monterey pine | 1B.1 ⓘ |
| Piperia michaelii | Michael's rein-orchid | 4.2 ⓘ |
| Plagiobothrys glaber | hairless popcornflower | 1A ⓘ |
| Puccinellia simplex | | 1B.2 ⓘ |
| Ranunculus lobbii | Lobb's buttercup | 4.2 ⓘ |
| Sanicula saxatilis | rock sanicle | 1B.2 ⓘ |
| Spergularia macrotheca var. longistyla | | 1B.2 ⓘ |
| Streptanthus albidus subsp. peramoenus | most beautiful jewelflower | 1B.2 ⓘ |
| Streptanthus hispidus | Mt. Diablo jewelflower | 1B.3 ⓘ |
| Suaeda californica | California sea-blite | 1B.1 ⓘ |
| Symphyotrichum lentum | Suisun Marsh aster | 1B.2 ⓘ |
| Trifolium hydrophilum | saline clover | 1B.2 ⓘ |
| Tropidocarpum capparideum | caper-fruited tropidocarpum | 1B.1 ⓘ |
| Viburnum ellipticum | western viburnum | 2B.3 ⓘ |
| Wolffia brasiliensis | | 2B.3 ⓘ |