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

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