| Scientific Name | Notes | Rarity Ranks | Common Name |
|---|---|---|---|
| Amaranthus powellii | CNPS-EB: A1 | Powell's amaranth | |
| Aphyllon pinorum | CNPS-EB: A1 | pine broom-rape | |
| Asclepias eriocarpa | CNPS-EB: A1 | KOTOLO | |
| Astragalus didymocarpus var. didymocarpus | (A. gambelianus is more common | CNPS-EB: A1 | two-seeded milkvetch |
| Berberis aquifolium var. dictyota | CNPS-EB: A1 | Jepson's mahonia | |
| Carex lenticularis var. lipocarpa | CNPS-EB: A1 | few-ribbed sedge | |
| Carex pellita | (formerly C. lanuginosa) | CNPS-EB: A1 | woolly sedge |
| Carex senta | CNPS-EB: A1 | western rough sedge, rough sedge | |
| Castilleja subinclusa subsp. franciscana | CNPS-EB: A1 | Franciscan indian paintbrush | |
| Chenopodium rubrum | CNPS-EB: A1 | red pigweed, red goosefoot | |
| Chorizanthe polygonoides var. polygonoides | CNPS-EB: A1 | knotweed spineflower | |
| Cirsium andrewsii | CNPS-EB: *A1 State CNPS: 1B.2 Global Rank: G3 CNDDB Rank: S3 | Franciscan thistle | |
| Cirsium douglasii var. douglasii | CNPS-EB: A1 | swamp thistle | |
| Clarkia tembloriensis subsp. tembloriensis | CNPS-EB: A1 | temblor clarkia | |
| Clintonia andrewsiana | CNPS-EB: A1 | red clintonia | |
| Collinsia sparsiflora var. unknown | CNPS-EB: C? | few-flowered blue-eyed Mary | |
| Cordylanthus nidularius | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CR | Mount Diablo bird's-beak | |
| Cornus glabrata | CNPS-EB: A1 | brown dogwood | |
| Cucurbita foetidissima | CNPS-EB: A1 | buffalo gourd, calabazilla, calabazilla | |
| Cuscuta campestris | CNPS-EB: A1 | field dodder | |
| Deinandra bacigalupii | (formerly Hemizonia increscens | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CE | Livermore tarplant |
| Dichondra donelliana | CNPS-EB: A1 | dichondra | |
| Downingia cuspidata | CNPS-EB: A1 | cuspidate downingia | |
| Draba cuneifolia | CNPS-EB: A1 | Sonora draba | |
| Elatine brachysperma | CNPS-EB: A1 | waterwort | |
| Elymus trachycaulus subsp. trachycaulus | CNPS-EB: A1 | slender wheat grass | |
| Eremalche parryi subsp. parryi | CNPS-EB: A1 | Parry's mallow | |
| Eremothera boothii subsp. decorticans | (formerly Camissonia boothii subsp. decorticans) | CNPS-EB: A1 | shredding evening-primrose |
| Eriastrum ertterae | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 CESA Status: CC | Ertter's eriastrum | |
| Eriogonum nudum var. psychicola | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 | Antioch Dunes buckwheat | |
| Eriogonum truncatum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | Mount Diablo buckwheat | |
| Eryngium aristulatum var. hooveri | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 | Hoover's button-celery | |
| Eryngium vaseyi var. vallicola | CNPS-EB: A1 | coyote-thistle, Vasey's coyote-thistle | |
| Erysimum capitatum var. angustatum | (ssp. capitatum is more common | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G5T1 CNDDB Rank: S1 FESA Status: FE CESA Status: CE | Contra Costa wallflower |
| Erythranthe latidens | (formerly Mimulus latidens) | CNPS-EB: A1 | broad-toothed monkeyflower |
| Eschscholzia caespitosa | CNPS-EB: A1 | tufted poppy | |
| Gratiola ebracteata | CNPS-EB: A1 | bractless hedge-hyssop | |
| Hesperolinon disjunctum | CNPS-EB: A1 | dwarf flax | |
| Horkelia californica var. californica | CNPS-EB: A1 | California horkelia | |
| Iris longipetala | CNPS-EB: *A1 State CNPS: 4.2 Global Rank: G3 CNDDB Rank: S3 | coast iris | |
| Isoetes howellii | CNPS-EB: A1 | Howell's quillwort | |
| Isolepis carinata | (formerly Scirpus koilolepis) | CNPS-EB: A1 | dwarf club-rush |
| Juncus oxymeris | CNPS-EB: A1 | pointed rush | |
| Juncus phaeocephalus var. unknown | CNPS-EB: A2? | brown-headed rush | |
| Leersia oryzoides | CNPS-EB: A1 | rice cutgrass | |
| Leptosiphon bolanderi | (formerly Linanthus b.) | CNPS-EB: A1 | Bolander's linanthus, Bolander's leptosiphon |
| Lilium pardalinum subsp. pardalinum | CNPS-EB: A1 | leopard lily | |
| Limosella acaulis | CNPS-EB: A1 | southern mudwort | |
| Lysimachia maritima | CNPS-EB: A1 | sea-milkwort | |
| Melica subulata | CNPS-EB: A1 | ||
| Monolepis nuttalliana | CNPS-EB: A1 | Nuttall's poverty weed, poverty weed | |
| Myriopteris gracillima | CNPS-EB: A1 | lace fern | |
| Navarretia hamata subsp. parviloba | CNPS-EB: A1 | hooked navarretia | |
| Navarretia heterandra | CNPS-EB: *A1 State CNPS: 4.3 Global Rank: G4 CNDDB Rank: S4 | Tehama navarretia | |
| Nitrophila occidentalis | CNPS-EB: A1 | nitrophila | |
| Phalaris arundinacea | CNPS-EB: A1 | reed canary grass | |
| Piperia unalascensis | CNPS-EB: A1 | Alaska piperia, slender-spire orchid | |
| Plagiobothrys leptocladus | CNPS-EB: A1 | alkali plagiobothrys | |
| Pseudognaphalium biolettii | (formerly Gnaphalium bicolor) | CNPS-EB: A1 | Bioletti's cudweed |
| Puccinellia nuttalliana | CNPS-EB: A1 | Nuttall's alkali grass | |
| Sedella pentandra | (formorely Parvisedum pentandr | CNPS-EB: A1 | Mount Hamilton sedella |
| Silene antirrhina | CNPS-EB: A1 | sleepy catchfly, snapdragon catchfly | |
| Sium suave | CNPS-EB: A1 | hemlock water-parsnip | |
| Sparganium eurycarpum var. eurycarpum | CNPS-EB: A1 | bur-reed | |
| Sporobolus airoides | CNPS-EB: A1 | alkali sacaton | |
| Stephanomeria elata | CNPS-EB: A1 | stephanomeria | |
| Trifolium macraei | CNPS-EB: A1 | Macrae's clover, double-headed clover | |
| Trifolium wormskioldii | CNPS-EB: A1 | cow clover | |
| Triteleia peduncularis | CNPS-EB: A1 | long-rayed brodiaea | |
| Tropidocarpum capparideum | CNPS-EB: *A1 State CNPS: 1B.1 Global Rank: G1 CNDDB Rank: S1 | caper-fruited tropidocarpum | |
| Viola adunca subsp. adunca | CNPS-EB: A1 | western blue violet |