All Plants (CNPS RPI)

The CNPS Rare Plant Inventory is a resource for information about California’s rare plants to promote education, scientific research, conservation planning, and effective enforcement of environmental laws. The East Bay is home to more than 100 of these statewide rare plants.

Scientific NameNotesRarity RanksCommon Name
Acanthomintha lanceolataCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
Santa Clara thornmint
Allium sharsmithiaeCNPS-EB: *A2
State CNPS: 1B.3
Global Rank: G2
CNDDB Rank: S2
Sharsmith's onion
Amsinckia douglasiana(historical-1938)CNPS-EB: *A1x
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
Douglas' fiddleneck
Amsinckia grandifloraCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CE
large-flowered fiddleneck
Amsinckia lunarisCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G3
CNDDB Rank: S3
bent-flowered fiddleneck
Androsace elongata subsp. acutaCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G5?T3T4
CNDDB Rank: S3S4
California androsace
Arabis blepharophyllaCNPS-EB: *A1x
State CNPS: 4.3
Global Rank: G4
CNDDB Rank: S4
coast rockcress
Arctostaphylos auriculataCNPS-EB: *A2
State CNPS: 1B.3
Global Rank: G2
CNDDB Rank: S2
Mount Diablo manzanita
Arctostaphylos manzanita subsp. laevigataCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G5T2
CNDDB Rank: S2
Contra Costa manzanita
Arctostaphylos pallidaCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FT
CESA Status: CE
pallid manzanita
Aspidotis carlotta-halliaeCNPS-EB: *A1x
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
Carlotta Hall's lace fern
Astragalus nuttallii var. nuttallii(historical-1866)CNPS-EB: *A1x
State CNPS: 4.2
Global Rank: G4T4
CNDDB Rank: S4
ocean bluff milkvetch, Nuttall's milk-vetch
Astragalus tener var. tenerCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2T1
CNDDB Rank: S1
alkali milkvetch
Atriplex coronata var. coronataCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4T3
CNDDB Rank: S3
crownscale
Atriplex depressaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
brittlescale
Atriplex minusculaCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G2
CNDDB Rank: S2
LESSER SALTSCALE
Balsamorhiza macrolepisCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
big-scale balsamroot
Blepharizonia plumosaCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G1G2
CNDDB Rank: S1S2
big tarplant
Calandrinia breweriCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
Brewer's calandrinia
Calochortus pulchellusCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Mount Diablo fairy-lantern
Calochortus umbellatusCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G3?
CNDDB Rank: S3?
Oakland star-tulip
Calystegia purpurata subsp. saxicola(historical-1893) (ssp. purpurCNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G4T2T3
CNDDB Rank: S2S3
coastal bluff morning-glory
Campanula exiguaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
chaparral harebell
Campanula sharsmithiaeCNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G1G2
CNDDB Rank: S1S2
SHARSMITH'S HAREBELL
Carex comosaCNPS-EB: *A1x
State CNPS: 2B.1
Global Rank: G5
CNDDB Rank: S2
bristly sedge
Castilleja ambigua subsp. ambiguaCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G5T4
CNDDB Rank: S3S4
Johnny-nip
Caulanthus lemmonii(formerly C. coulteri var. l.)CNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G3
CNDDB Rank: S3
Lemmon's jewelflower
Centromadia parryi subsp. congdonii(formerly Hemizonia p. ssp. c.CNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G3T2
CNDDB Rank: S2
Congdon's tarplant
Chlorogalum pomeridianum var. minusCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G5T3
CNDDB Rank: S3
DWARF SOAPROOT
Chloropyron maritimum subsp. palustre(historical-1917)CNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G4?T2
CNDDB Rank: S2
Point Reyes salty bird's-beak
Chloropyron molle subsp. hispidumCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G2T1
CNDDB Rank: S1
hispid salty bird's-beak, hispid bird's-beak
Chloropyron molle subsp. molleCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2T1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CR
soft salty bird's-beak, soft bird's-beak
Chloropyron palmatumCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CE
palmate salty bird's-beak, palmate-bracted bird's-beak
Chorizanthe cuspidata var. cuspidata(historical-1881)CNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G2T1
CNDDB Rank: S1
San Francisco Bay spineflower
Chorizanthe robusta var. robusta(historical-1913)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G2T1
CNDDB Rank: S1
FESA Status: FE
robust spineflower
Cicuta maculata var. bolanderiCNPS-EB: *A1
State CNPS: 2B.1
Global Rank: G5T4T5
CNDDB Rank: S2?
Bolander's water-hemlock, water hemlock
Cirsium andrewsiiCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G3
CNDDB Rank: S3
Franciscan thistle
Cirsium fontinale var. campylonCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2T2
CNDDB Rank: S2
Mount Hamilton fountain thistle
Clarkia breweriCNPS-EB: *A1
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
Brewer's clarkia
Clarkia concinna subsp. automixa(ssp. concinna is more common)CNPS-EB: *A2
State CNPS: 4.3
Global Rank: G5?T3
CNDDB Rank: S3
Santa Clara red ribbons
Clarkia franciscanaCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CE
Presidio clarkia
Collomia diversifoliaCNPS-EB: *A1
State CNPS: 4.3
Global Rank: G4
CNDDB Rank: S4
serpentine collomia
Convolvulus simulansCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
small-flowered morning-glory
Cordylanthus nidulariusCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
CESA Status: CR
Mount Diablo bird's-beak
Cryptantha hooveri(historical-1908)CNPS-EB: *A1x
State CNPS: 1A
Global Rank: GH
CNDDB Rank: SH
Hoover's cryptantha
Deinandra bacigalupii(formerly Hemizonia increscensCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
CESA Status: CE
Livermore tarplant
Delphinium californicum subsp. interiusCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G3T3
CNDDB Rank: S3
Hospital Canyon larkspur
Delphinium recurvatumCNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G2?
CNDDB Rank: S2
recurved larkspur
Dirca occidentalisCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
western leatherwood
Eleocharis parvulaCNPS-EB: *A1
State CNPS: 4.3
Global Rank: G5
CNDDB Rank: S3
small spikerush
Eriastrum ertteraeCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
CESA Status: CC
Ertter's eriastrum
Eriogonum luteolum var. caninumCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G5T2
CNDDB Rank: S2
Tiburon buckwheat
Eriogonum nudum var. psychicolaCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G5T1
CNDDB Rank: S1
Antioch Dunes buckwheat
Eriogonum truncatumCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
Mount Diablo buckwheat
Eriogonum umbellatum var. bahiiformePreviously mis-recorded as var. smallianum which does not occur in the East BayCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G5T3
CNDDB Rank: S3
Small's sulphur flower, bay buckwheat
Eriophyllum jepsoniiCNPS-EB: *A2
State CNPS: 4.3
Global Rank: G3
CNDDB Rank: S3
Jepson's woolly sunflower
Eryngium aristulatum var. hooveriCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G5T1
CNDDB Rank: S1
Hoover's button-celery
Eryngium jepsoniiCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Eryngium racemosumCNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
CESA Status: CE
delta button-celery
Eryngium spinosepalumCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Erysimum capitatum var. angustatum(ssp. capitatum is more commonCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G5T1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CE
Contra Costa wallflower
Erythranthe inconspicuaCNPS-EB: *A1
State CNPS: 4.3
Global Rank: G4
CNDDB Rank: S4
Eschscholzia rhombipetalaCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
diamond-petaled California poppy
Extriplex joaquinanaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
San Joaquin spearscale, San Joaquin saltbush
Fritillaria agrestisCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
stinkbells
Fritillaria falcataCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
talus fritillary
Fritillaria liliaceaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
fragrant fritillary
Galium andrewsii subsp. gatenseCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G5T3
CNDDB Rank: S3
phlox-leaf serpentine bedstraw, serpentine bedstraw
Gilia millefoliataCNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
DARK-EYED GILIA
Helianthella castaneaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Diablo helianthella
Hesperevax caulescens(H. sparsiflora is more commonCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
hogwallow starfish
Hesperolinon breweriCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Brewer's western flax
Hesperolinon tehamense3 questionable ID sites. Needs field researchCNPS-EB: *A1?
State CNPS: 1B.3
Global Rank: G2
CNDDB Rank: S2
Napa western flax
Hibiscus lasiocarpos var. occidentalisCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G5T3
CNDDB Rank: S3
rose-mallow
Hoita strobilina(historical-1865)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G2?
CNDDB Rank: S2?
Loma Prieta hoita
Holocarpha macradeniaCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FT
CESA Status: CE
Santa Cruz tarplant
Horkelia cuneata var. sericea(historical-1894)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G4T1?
CNDDB Rank: S1?
Kellogg's horkelia
Iris longipetalaCNPS-EB: *A1
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
coast iris
Isocoma arguta(historical-date unknown)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
Carquinez goldenbush
Lasthenia conjugensCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FE
Contra Costa goldfields
Lasthenia ferrisiaeCNPS-EB: *A1
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
Ferris' goldfields
Lathyrus jepsonii var. jepsoniiCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G5T2
CNDDB Rank: S2
delta tule pea, Delta tule pea
Legenere limosaCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G2
CNDDB Rank: S2
legenere
Leptosiphon ambiguus(formerly Linanthus a.)CNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
serpentine leptosiphon, serpentine linanthus
Leptosiphon aureus(formerly L.acicularis, Linanthus acicularis)CNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4?
CNDDB Rank: S4?
bristly leptosiphon, bristly linanthus
Leptosiphon grandiflorus(formerly Linanthus g.)CNPS-EB: *A1x
State CNPS: 4.2
Global Rank: G3G4
CNDDB Rank: S3S4
large-flowered leptosiphon, large-flowered linanthus
Leptosyne hamiltonii(formerly Coreopsis h.)CNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Mount Hamilton coreopsis
Lessingia hololeuca(historical-1940)CNPS-EB: *A1x
State CNPS: 3
Global Rank: G2G3
CNDDB Rank: S2S3
woolly-headed lessingia
Lessingia tenuisCNPS-EB: *A2
State CNPS: 4.3
Global Rank: G4
CNDDB Rank: S4
spring lessingia
Lilaeopsis masoniiCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G2
CNDDB Rank: S2
CESA Status: CR
Mason's lilaeopsis
Madia radiata(historical-1941)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G3
CNDDB Rank: S3
showy golden madia, showy madia
Malacothamnus hallii(M. fasciculatus in Jepson ManCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Hall's bush-mallow
Meconella oreganaCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G2
CNDDB Rank: S2
Oregon meconella
Micropus amphibolus(historical - 1955)CNPS-EB: *A1x
State CNPS: 3.2
Global Rank: G3G4
CNDDB Rank: S3S4
Mount Diablo cottonseed, Mt. Diablo cottonweed
Microseris sylvaticaCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
sylvan microseris
Monolopia gracilensCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G3
CNDDB Rank: S3
woodland woollythreads, woodland monolopia
Myosurus minimus subsp. apusCNPS-EB: *A1?
State CNPS: 3.1
Global Rank: G5T2Q
CNDDB Rank: S2
little mousetail
Navarretia cotulifoliaCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S4
cotula navarretia
Navarretia goweniiCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
Lime Ridge navarretia
Navarretia heterandraCNPS-EB: *A1
State CNPS: 4.3
Global Rank: G4
CNDDB Rank: S4
Tehama navarretia
Navarretia nigelliformis subsp. nigelliformisCNPS-EB: *A2?
State CNPS: 4.2
Global Rank: G4T3
CNDDB Rank: S3
adobe navarretia
Navarretia nigelliformis subsp. radiansCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G4T2T3
CNDDB Rank: S2S3
shining navarretia
Navarretia prostrataCNPS-EB: *A1
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
prostrate vernal pool navarretia
Oenothera deltoides subsp. howelliiCNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G5T1
CNDDB Rank: S1
FESA Status: FE
CESA Status: CE
Antioch Dunes evening-primrose
Perideridia gairdneri subsp. gairdneriCNPS-EB: *A1x
State CNPS: 4.2
Global Rank: G5T3T4
CNDDB Rank: S3S4
Gairdner's yampah
Phacelia phacelioidesCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Mount Diablo phacelia
Piperia michaeliiCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G3
CNDDB Rank: S3
Michael's rein-orchid
Plagiobothrys chorisianus var. chorisianus(historical-1890)CNPS-EB: *A1x
State CNPS: 1B.2
Global Rank: G3T1Q
CNDDB Rank: S1
Choris' popcornflower
Plagiobothrys diffususCNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G1Q
CNDDB Rank: S1
CESA Status: CE
San Francisco popcornflower
Plagiobothrys glaberCNPS-EB: *A1
State CNPS: 1A
Global Rank: GX
CNDDB Rank: SX
hairless popcornflower
Polemonium carneumCNPS-EB: *A1x
State CNPS: 2B.2
Global Rank: G3G4
CNDDB Rank: S2
Oregon polemonium, great polemonium
Polygonum marinenseCNPS-EB: *A1x
State CNPS: 3.1
Global Rank: G2Q
CNDDB Rank: S2
MARIN KNOTWEED
Potamogeton zosteriformis(historical-1949)CNPS-EB: *A1x
State CNPS: 2B.2
Global Rank: G5
CNDDB Rank: S3
eel-grass pondweed
Psilocarphus brevissimus var. multiflorusMay not occur in EastBay (var. brevissimus is more commonCNPS-EB: *A1?
State CNPS: 4.2
Global Rank: G4T3
CNDDB Rank: S3
delta woolly-marbles
Puccinellia simplexCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
little alkali grass
Ranunculus lobbiiCNPS-EB: *A2
State CNPS: 4.2
Global Rank: G4
CNDDB Rank: S3
Lobb's aquatic buttercup
Sanicula maritima(historical-1936)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G2
CNDDB Rank: S2
CESA Status: CR
adobe sanicle
Sanicula saxatilisCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
CESA Status: CR
rock sanicle
Scutellaria galericulata(historical-1949)CNPS-EB: *A1x
State CNPS: 2B.2
Global Rank: G5
CNDDB Rank: S2
marsh skullcap
Senecio aphanactisCNPS-EB: *A1x
State CNPS: 2B.2
Global Rank: G3
CNDDB Rank: S2
chaparral ragwort, rayless ragwort
Spergularia macrotheca var. longistylaCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G5T2
CNDDB Rank: S2
large-flowered sand spurry
Streptanthus albidus subsp. peramoenusCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2T2
CNDDB Rank: S2
most beautiful jewel-flower
Streptanthus hispidusCNPS-EB: *A2
State CNPS: 1B.3
Global Rank: G2
CNDDB Rank: S2
Mount Diablo jewelflower
Stuckenia filiformis subsp. alpina(formerly Potamogeton f.)CNPS-EB: *A1x
State CNPS: 2B.2
Global Rank: G5T5
CNDDB Rank: S2S3
slender-leaved potamogeton
Suaeda californica(historical-1958)CNPS-EB: *A1x
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
FESA Status: FE
California seablite
Symphyotrichum lentum(formerly Aster lentus)CNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
Suisun marsh aster
Trifolium hydrophilum(vars. amplectens and truncatuCNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
saline clover
Tropidocarpum capparideumCNPS-EB: *A1
State CNPS: 1B.1
Global Rank: G1
CNDDB Rank: S1
caper-fruited tropidocarpum
Viburnum ellipticumCNPS-EB: *A2
State CNPS: 2B.3
Global Rank: G4G5
CNDDB Rank: S3
oval-leaved viburnum
Wolffia brasiliensisCNPS-EB: *A1
State CNPS: 2B.3
Global Rank: G5
CNDDB Rank: S2
BRAZILIAN WATERMEAL