Scientific NameCommon NameFamilyLifeformCRPRGRankSRankCESAFESABloomingHabitatMicro HabitatElev. Low (m)Elev. High (m)CA EndemicStatesCountiesQuadsNotesFull Scientific NameSynonyms Other NamesElement CodeCBR ReasonDate AddedDate ChangedLast Update
Allium sanbornii var. congdoniiPossibly threatened by non-native plants and vehicles. See Flora of California 1(6):275 (1922) by W.L. Jepson for original description, and Madroño 36(2):122-130 (1989) for taxonomic treatment.8/15/2019
Amorpha californica var. napensis160 5011/7/2019
Angelica lucidaApril May-Sep3/3/2021
Arabis blepharophyllaLakeWhispering Pines (533C) 38122766/6/2019
Astragalus pulsiferae var. coronensis(Apr)May-Jul 12/8/2020
Astragalus tephrodes var. brachylobusCBRNot native; historically occurred in CA as a waif from AZ.11/22/201911/22/2019
Astragalus umbraticus2B.3 2B.25/12/2020
Atriplex flavidaCarrizo Plain crownscaleChenopodiaceaeannual herb1B.3G2G3S2S3NoneNoneMar-Julchenopod scrub, valley and foothill grassland, vernal poolsalkaline585605yesSan Luis ObispoPanorama Hills (217B) 3511926, Painted Rock (218A) 3511927, Chimineas Ranch (218B) 3511928, Simmler (243C) 3511938, California Valley (244D) 3512031Threatened by agricultural development. Possibly threatened by vehicles, grazing, non-native plants, road construction, and foot traffic. Formerly included in A. coronata var. vallicola; differentiated from all A. coronata varieties in having an overall yellow-green color (vs. gray-green), 3(4) stamens (vs. (4)5 stamens), and longer fruiting bracteoles in addition to other characters. See Genera and a New Evolutionary System of World Chenopodiaceae (2017) by Chu and Sanderson for original description, and Phytoneuron 65:1-7 (2018) for taxonomic treatment and revised nomenclature.Atriplex flavida (S. C. Sand. & G. L. Chu) D. J. Keil & D. W. Taylor?11/4/201911/4/2019
Atriplex subtilis(April)Jun,Aug,Sep(Oct)5/28/2020
Balsamorhiza sericeaOn watch list in OR. Perhaps not distinct from B. macrolepis var. platylepis. See Phytologia 50(5):357-359 (1982) for original description. 10/5/2020
Bensoniella oregona915 9006/5/2019
Brasenia schreberi 30 010/25/2019
Brodiaea rosea ssp. roseaBrodiaea rosea (Greene) Baker ssp. rosea7/10/2019
Calchortus clavatus var. clavatus30 756/22/2020
Calochortus longebarbatus var. longebarbatusJun-Aug(Sept)5/5/2020
Calystegia collina ssp. venusta270 42511/7/2019
Calystegia macrostegia ssp. cyclostegiaCBRCalystegia macrostegia ssp. cyclostegia (House) BrummittToo common.7/15/20197/15/2019
Cardamine angulata25 156/6/2019
Carex californica2B.3 2B.2Threatened by development and road construction and maintenance. Possibly threatened by logging. Sensitive in ID. See Memoirs of the Torrey Botanical Club 1:9 (1889) for original description.
Ceanothus fresnensis
2103 221012/18/2019
Ceanothus pinetorum1040 160012/18/2019
Chorizanthe aphananthaIrish Hills spineflowerPolygonaceaeannual herb1B.1G1S1NoneNoneApr-Junchaparral (edges, openings), coastal scrubserpentinite, rocky to gravelly100370yesSan Luis ObispoPismo Beach (221B) 3512026, San Luis Obispo (246C) 3512036Similar to and co-occurs with C. breweri; differentiated in having perianth 1.5-1.7 mm long (vs. 2-5 mm) and involucre green at flowering (vs. red to purple at flowering in C. breweri). See Madroño 65(4):184-191 (2018) for original description and taxonomic key.Chorizanthe aphanantha K.M.Nelson & D.J.Keil 6/11/20196/11/2019
Cirsium fontinale var. campylonMt. Hamilton thistle Mt. Hamilton fountain thistle9/4/2019
Cirsium fontinale var. fontinalefountain thistle Crystal Springs fountain thistle9/4/2019
Cirsium fontinale var. obispoenseThreatened by grazing, development, and proposed water diversions. Possibly threatened by foot traffic, and non-native plants. See Leaflets of Western Botany 2:71 (1938) for original description, and Bulletin of the Southern California Academy of Sciences 115(3):156-175 (2016) for status information.8/23/2019
Cirsium fontinale var. obispoenseChorro Creek bog thistle San Luis Obispo fountain thistle9/4/2019
Clarkia borealis ssp. borealis1B.3 4.3G3T3 G4T4S3 S4Shasta, Siskiyou, TrinityPossibly threatened by road construction and maintenance, and non-native plants. Potentially threatened by timber harvest activities. Need quads for TRI Co. Distinctiveness from ssp. arida needs study. See Canadian Journal of Botany 49:1211-1217 (1971) for taxonomic revision.
Changed from 1B.3 to 4.3 on 2020-03-16
More common than originally thought. Possibly threatened by non-native plants. Potentially threatened by timber harvest activities. Distinctiveness from ssp. arida needs study. See Canadian Journal of Botany 49(7):1211-1217 (1971) for original description.
Clarkia gracilis ssp. albicaulisThreatened by urbanization and non-native plants. Possibly threatened by erosion and road maintenance. See University of California Publications in Botany 2:239 (1907) for original description and 20:241-392 (1955) for taxonomic treatment.12/18/2019
Claytonia lanceolata var. peirsoniiPeirson’s spring beauty synonymMontiaceaeperennial herb3.1G5T1QS1NoneNone(Mar) May-Junsubalpine coniferous forest, upper montane coniferous forestscree15102745yesSan BernardinoCucamonga Peak (108A) 3411725, Fawnskin (131C) 3411638, Telegraph Peak (134D) 3411735, Crystal Lake (135D) 3411737Previously CRPR 1B.1. Known only from the San Gabriel Mtns. Threatened by foot traffic, recreational activities, and proposed ski area expansion. Possibly threatened by vehicles. Angeles NF has adopted species management guidelines. A synonym of C. lanceolata in TJM (1993) and TJM 2. See Bulletin of the Torrey Botanical Club 49:352 (1922) for original description.Claytonia peirsonii (Munz & I.M. Johnst.) Stoughton subsp. peirsoniisynonym of Claytonia peirsonii ssp. peirsoniiPDPOR03097 7/26/20197/26/2019
Claytonia obovataRydberg's spring beautyMontiaceaeperennial herb4.3G4S3NoneNone(Mar-Apr) May-Jun (Jul)subalpine coniferous forestrocky talus slopes, usually openings13852835noOregonLake, Mendocino, Siskiyou, Tehama, Trinity, Tuolumne?Strawberry (474A?) 3812021, Hull Mountain (581C) 3912258, Mendocino Pass (597C) 3912278, Leech Lake Mtn. (598A) 3912381, Mumbo Basin (683A) 4112225, Tangle Blue Lake (683B) 4112226, Cecil Lake (685C) 4112312, Salmon Mtn. (686B) 4112324, Weed (699B) 4112244, Mount Eddy (699C) 4112234, Scott Mountain (700C) 4112236, South China Mtn. (700D) 4112235, Yreka (717B) 4112266See North American Flora 21(4):299 (1932) for original description, and Systematic Botany 42(2):283-300 (2017) for taxonomic treatment.Claytonia obovata Rydberg?3/3/20203/3/2020
Claytonia panamintensisPanamint spring beautyMontiaceaeperennial herb1B.1G3G4T1 G1S1NoneNoneMar-Maypinyon and juniper woodland (openings)rocky, talus slopes, carbonate18251930yesInyoPanamint (302D) 3611711See Aliso 31(1):35-42 (2013) for notes on discovery, and Systematic Botany 42(2):283-300 (2017) for original description.Claytonia panamintensis T.R. Stoughton?11/4/201911/5/2019
Claytonia peirsonii ssp. bernardinusSan Bernardino spring beautyMontiaceaeperennial herb1B.1G3G4T1 G2G3T1S1NoneNoneMar-Aprpinyon and juniper woodland, upper montane coniferous forestrocky, talus, carbonate, usually openings23602465yesSan BernardinoFawnskin (131C) 3411638See Aliso 31(1):35-42 (2013) for notes on discovery, and Systematic Botany 42(2):283-300 (2017) for original description.Claytonia peirsonii (Munz & Johnston) T.R. Stoughton subsp. bernardinus T.R. Stoughton?10/30/201911/5/2019
Claytonia peirsonii ssp. californacisFurnace spring beautyMontiaceaeperennial herb1B.1G3G4T1 G2G3T1S1NoneNoneMar-Maypinyon and juniper woodland, upper montane coniferous forestrocky, talus, carbonate, usually openings23002300yesSan BernardinoFawnskin (131C) 3411638See Aliso 31(1):35-42 (2013) for notes on discovery, and Systematic Botany 42(2):283-300 (2017) for original description.Claytonia peirsonii (Munz & Johnston) T.R. Stoughton subsp. californacis T.R. Stoughton?10/30/201911/5/2019
Claytonia peirsonii ssp. peirsoniiPeirson’s spring beautyMontiaceaeperennial herb1B.2G5T2 G2G3T2S2NoneNone(Mar) May-Junsubalpine coniferous forest, upper montane coniferous forestgranitic, metamorphic, scree, talus15102745yesLos Angeles, San BernardinoCucamonga Peak (108A) 3411725, Telegraph Peak (134D) 3411735, Crystal Lake (135D) 3411737Threatened by foot traffic, recreational activities, and proposed ski area expansion. See Bulletin of the Torrey Botanical Club 49(12):352 (1923) for original description, and Systematic Botany 42(2):283-300 (2017) for revised nomenclature and taxonomic treatment.Claytonia peirsonii (Munz & I.M. Johnst.) Stoughton subsp. peirsoniiClaytonia lanceolata var. peirsonii?7/26/20197/26/2019
Claytonia peirsonii ssp. yorkiiYork’s spring beautyMontiaceaeperennial herb1B.1G3G4T1 G2G3T1S1NoneNoneMar-Maycismontane woodlandrocky, talus slopes, alkaline, volcanic, usually openings14501505yesKernCross Mountain (236C) 3511832See Aliso 31(1):35-42 (2013) for notes on discovery, and Systematic Botany 42(2):283-300 (2017) for original description.Claytonia peirsonii (Munz & Johnston) T.R. Stoughton subsp. yorkii T.R. Stoughton?11/4/201911/5/2019
Claytonia serpenticolaserpentine spring beautyMontiaceaeperennial herb4.3G3S3None NoneApr-Jun(Jul)upper montane coniferous forest, subalpine coniferous forestrocky slopes, xeric, usually openings, usually serpentinite 10002450noOregonHumboldt, Shasta, Siskiyou, TrinityBlack Lassic (634D) 4012335, Covington Mill (667A) 4012287, Siligo Peak (667B) 4012288, Grouse Mtn. (670C) 4012376, Seven Lakes Basin (682B) 4112224, Tangle Blue Lake (683B) 4112226, Whisky Bill Peak (683D) 4112215, Caribou Lake (684C) 4112218, Ycatapom Peak (684D) 4112217, Mount Eddy (699C) 4112234, South China Mtn. (700D) 4112235, Marble Mtn. (719C) 4112352, Kangaroo Mtn. (736B) 4112382See Systematic Botany 42(2):283-300 (2017) for original description.Claytonia serpenticola T.R. Stoughton?12/31/201912/31/2019
Claytonia umbellata2B.3 2B.1Siskiyou, TrinityMount Eddy (699C) 4112234, Scott Mountain (700C) 4112236, South China Mtn. (700D) 4112235 Possibly threatened by vehicles. See Botany of the King Exploration, p. 43 (1871) for original description.
Collinsia multicolor250 2757/17/2020
Cordylanthus rigidus ssp. brevibracteatusJul-Aug(Sept.-Oct)
Coryphantha alversoniiApr-Jun (Sep-Oct)5/20/2020
Cuniculotinus gramineusKnown from the Inyo and Panamint mountains. Does plant occur in SBD Co.? Potentially threatened by trampling. See Muhlenbergia 2:342 (1916) for original description and SIDA 21: 1619 (2005) for revised nomenclature.11/7/2019
Dalea ornataPotentially threatened by grazing. See Madroño 32(2):123 (1985) for CA record.8/18/2020
Delphinium recurvatumMany occurrences historical; need current information on status. Much habitat converted to agriculture; also threatened by grazing, trampling, and non-native plants. Potentially threatened by vehicles.8/15/2019
Draba aureolaOn watch list in OR, and state-listed as Sensitive in WA.
Dudleya abramsii ssp. setchellii455 5356/26/2020
Eriastrum rosamondense715 11757/2/2020
Eriogonum alpinum1675 218512/18/2019
Eriophyllum lanatum var. hallii1500 20007/2/2020
Eryngium racemosum
Erythranthe shevockii1B.2 1B.1Threatened by residential development, agricultural conversion, grazing, non-native plants, recreational activities, road maintenance, and vehicles. See Madroño 33(4):271-277 (1986) for original description, and Phytoneuron 2012-39:1-60 (2012) for revised nomenclature.2/19/2020
Erythronium hendersonii Oregon, Washington8/10/2020
Eucephalus glabratusJul Jun-SepOccurrences are few and possibly local, but widely distributed; needs field surveys. Includes plants previously identified as E. vialis; a former CRPR 1B.2 plant that is endemic to, and state-listed as Threatened, in OR. Difficult to differentiate from E. tomentellus; needs further study. See Pittonia 2(7B): 17 (1889) for original description, and Pittonia 3(14B): 56 for revised nomenclature (1896).7/21/20208/17/2020
Eucephalus vialiswayside asterAsteraceaeperennial herb1B.2G3S1NoneNoneJun-Seplower montane coniferous forest, upper montane coniferous forestgravel9101545noOregonDel Norte, HumboldtWillow Creek (670B) 4012386, Polar Bear Mtn. (738A) 4112385State-listed as Threatened in OR. Oregon Department of Fish and Wildlife uses the name Aster vialis. Once considered extinct but rediscovered in OR (1980). Not in The Jepson Manual. See Torreya 20:122 (1921) for original description, Rhodora 30:288 (1928) for alternate nomenclature, and Phytologia 77(3):256 (1994) for taxonomic treatment.Eucephalus vialis BradshawChanged from 1B.2 to CBR on 2020/07/21
Does not occur in CA; plants previously considered E. vialis in CA are assignable to E. glabratus.
Gilia ochroleuca ssp. lanosaSisquoc giliaPolemoniaceaeannual herb4.3G3S3NoneNone(Apr) May-Junchaparral, cismontane woodland, pinyon and juniper woodland (openings)sandy, rarely gravelly, sometimes streambanks4501480yesSanta Barbara, VenturaLion Canyon (165C) 3411952, Wheeler Springs (166D) 3411953, Madulce Peak (167A) 3411965, Big Pine Mtn. (167B) 3411966, Little Pine Mtn. (167C) 3411956, Salisbury Potrero (192C) 3411976, Fox Mountain (192D) 3411975, Bates Canyon (193B) 3411988, Bald Mountain (193C) 3411978, Hurricane Deck (193D) 3411977, Sisquoc (195D) 3412073Previously identified as G. ochroleuca ssp. bizonata; differentiated from this and other G. ochroleuca sspp. by its dense lanate tomentum on stems. See Phytoneuron 2014-90:1-16 (2014) for original description.Gilia ochroleuca M.E. Jones subsp. lanosa Hrusa?12/20/201912/20/2019
Harmonia hallii(March)Apr-Jun5/27/2020
Helianthella castaneaUsually rocky, azonal axonal soils. Often in partial shade.
Hemieva ranunculafoliabuttercup-leaf suksdorfia buttercup-leaf hemieva2/25/20212/25/2021
Hesperolinon bicarpellatum(April)May-July5/27/2020
Hosackia yollabolliensisPreviously CRPR 4.3; rarer than originally thought. Known only from the South Fork and Yolla Bolly Mtns. Threatened by vehicles, conifer encrouchment, and non-native plants. Potentially threatened by climate shifts. Possibly threatened by trampling and grazing. See Aliso 3:117 (1955) for original description and Kew Bulletin 55(4):1010 (2000) for revised nomenclature.
Hymenoxys lemmonii(May)Jun -Aug(Sep)9/26/2019
Iris longipetalaMar-May (June)8/6/2020
Juglans hindsiiNorthern California black walnutJuglandaceaeperennial deciduous tree1B.1 CBRG1S1NoneNoneApr-Mayriparian forest, riparian woodland0440yesContra Costa, Lake?, Napa, Sacramento*, Solano*, Yolo*Las Trampas Ridge (465D) 3712271, Isleton (480A)* 3812125, Rio Vista (480B)* 3812126, Florin (496B) 3812144, Clarksburg (497A) 3812145, Courtland (497D) 3812135, Capell Valley (499B) 3812242, Napa (500D)* 3812233, Jericho Valley (532C)? 3812274Only one confirmed, native occurrence appears viable as of 2003. Sizes and sites of trees in occurrences on quad 532C indicate they are historical; however further study is needed to determine native status. Reported as possibly present in BUT Co. (575C), but native status questionable. Widely naturalized in cismontane CA. Threatened by hybridization with orchard trees, urbanization, and conversion to agriculture. Formerly cultivated as rootstock for J. regia, with which it hybridizes readily. A synonym of J. californica var. hindsii in TJM (1993). See Flora of California 1(2):365 (1909) by W.L. Jepson for original description, and Madroño 17(1):1-32 (1963) for discussion of origin.Juglans hindsii (Jeps.) Jeps.Juglans californica var. hindsiiPDJUG02040Changed from 1B.1 to CBR: Too common. Formerly recognized from only 5 natural occurrences and thought to be widely naturalized, cultivated, and hybridized with orchard trees and with J. regia. See Madroño 63(3):131-140 (2018) for study indicating that genetically pure representatives of J. hindsii are common throughout CA and southern OR. 7/10/20197/10/2019
Lasthenia chrysanthaalkali-sink goldfieldsAsteraceaeannual herb1B.1G1S1NoneNoneFeb-Aprvernal poolsalkaline0200yesFresno, Kern, Kings, Madera, Merced, Solano, Stanislaus, TulareLost Hills NW (265B) 3511966, Sausalito School (287B) 3511982, Delano East (287C) 3511972, Pixley (288A) 3511983, Alpaugh (288B) 3511984, Allensworth (288C) 3511974, Delano West (288D) 3511973, Cairns Corner (310B) 3611922, Woodville (310C) 3611912, Tulare (311A)* 3611923, El Rico Ranch (312C)(?) 3611916, Monson (334A) 3611943, Traver (334B) 3611944, Goshen (334C)* 3611934, Laton (335B) 3611946, Remnoy (335D) 3611935, Kerman (359A)* 3612061, Jamesan (359B) 3612062, Helm (359D) 3612051, Tranquility (360A) 3612063, Gravelly Ford (380C) 3612072, Laguna Seca Ranch (383D) 3612077, El Nido (401B) 3712024, Chowchilla (401D)* 3712013, Arena (422C) 3712036, Hatch (423B)* 3712048, Gustine (423C) 3712038, Crows Landing (424A) 3712141, Ripon (443B) 3712162, Westley (443C) 3712152, Dozier (498D) 3812137Threatened by habitat loss, agriculture, urbanization, and development. See Synoptical Flora of North America 1(2):445 (1884) for original description, and Manual of the Botany of the Region of San Francisco Bay, p. 204 (1894) by E.L. Greene for revised nomenclature.Lasthenia chrysantha (A. Gray) Greene9/30/20199/30/2019
Leptosiphon croceus
Threatened by development. Possibly threatened by foot traffic. See L. parviflorus in TJM (1993). See Botanical Gazette 37:442 (1904) for original description, and Aliso 19(1):55-91 (2000) for revised nomenclature.
Listera cordata(May)7/12/2019
Lomatium shevockii1B.3 1B.2Threatened by non-native plants.6/6/2019
Lupinus milo-bakeriSeriously threatened by urbanization, road maintenance, road widening, and herbicide application. Potentially threatened by competition. See L. luteolus in TJM (1993). See Four Seasons 1(3):8-9 (1965) and TJM2 for differentiation from L. luteolus.8/2/2019
Lysimachia thyrsifloraPossibly threated by non native plants. 9/2/2020
Mentzelia inyoensis1B.3 1B.1Threatened by feral herbivores. See Madrono 51(4): 379 (2004) for original description.9/17/20209/17/2020
Mertensia bellaOregon lungwort bluebells6/19/2019
Monardella robisoniiPotentially threatened by recreational activities. May occur in BA; need confirmation. Closely related to and possibly a variety of M. linoides.11/7/2019
Muhlenbergia alopecuroides wolftailPoaceaeperennial herb2B.2G5S1?NoneNoneAug-SepJoshua tree woodland, pinyon juniper woodland??noArizona, Colorado, Kansas, Maine, New Mexico, Oklahoma, Texas, Utah; Baja California, Sonora, Mexico, South AmericaSan BernardinoPinto Valley (200A) 3511523Known in CA only from one occurrence in the New York Mtns. Threatened by grazing.Muhlenbergia alopecuroides (Griseb.) P.M. Peterson & ColumbusLycurus phleoides var. phleoidesPMPOA3W020Not native; occurred in CA only as a roadside waif.7/26/20197/26/2019
Muhlenbergia emersleyibullgrassPoaceaeperennial herb2B.2G5S1NoneNoneSep-Novchaparral (montane)rocky, gravelly, often gabbroic12801570noArizona, New Mexico, Texas; Baja California, Sonora MexicoRiversideToro Peak (065C) 3311654, Butterfly Peak (066D) 3311655Discovered in CA by Keir Morse in 2016. See Contributions from the United States National Herbarium 3(1): 66 (1892) for original description, and American Journal of Botany 97(9):1532-1554 for phylogenetic classification.Muhlenbergia emersleyi VaseyPMPOA480K07/26/20197/26/2019
Muhlenbergia utilisaparejo grassPoaceaeperennial rhizomatous herb2B.2G4S2S3NoneNoneMar-Octmeadows and seeps, marshes and swamps, chaparral, coastal scrub, cismontane woodlandsometimes alkaline, sometimes serpentinite252325noArizona, Nevada, New Mexico, Texas; Sonora, MexicoInyo, Kern, Monterey, San Bernardino, San Luis Obispo, Santa Barbara, VenturaGuasti (108D) 3411715, White Ledge Peak (141B) 3411944, Old Man Mountain (166C) 3411954, Los Alamos (170A) 3412063, Liebre Twins (188A) 3411885, Winters Ridge (188B) 3411886, La Liebre Ranch (188C) 3411876, Tar Spring Ridge (220B) 3512024, Buttonwillow (241B) 3511944, San Luis Obispo (246C) 3512036, Morro Bay South (247D) 3512037, Burnett Peak (295C) 3512172, Burro Mountain (296D) 3512173, Kearsarge Peak (373D) 3611873, Sand Spring (390A) 3711725, Balloon Dome (416B) 3711942Threatened by development. Potentially threatened by grazing. See Pacif. Railr. Rep. 5(2):365-366 (1857) for original description, and Journal of the Washington Academy of Sciences 23(10):453 (1933) for revised nomenclature.Muhlenbergia utilis (Torr.) Hitchc.PMPOA481X07/10/20197/10/2019
Navarretia miwukensisMi-Wuk navarretia Polemoniaceaeannual herb1B.2G1G2S1S2NoneNoneMay-Jun(Jul)lower montane coniferous forestopen, sparsely vegetated pyroclastic flows, often gently sloping terrain8001,500yesCalaveras, TuolumneAscension Mtn. (456C) 3711978, Duckwall Mtn. (457A) 3712081, Twain Harte (474C) 3812012, Murphys (475B) 3812024, Columbia (475C) 3812014Previously identified as N. divaricata. Threatened by urbanization, vehicles, illegal dumping, recreational activities, and non-native plants. Potentially threatened by development. Similar to N. crystallina; distinguished in having less dense inflorescence trichomes, with more conspicuous viscid, short-stipitate glands, and in having acuminate bracts and calyx lobes with wide, convex bases, versus evenly tapered, long-acute lobes in N. crystallina. See Phytotaxa 257(3):249-260 (2016) for original description.Navarretia miwukensis D.Gowen & L.A.Johnson?6/14/20196/14/2019
Navarretia panochensisPanoche navarretiaPolemoniaceaeannual herb4.3G3S3NoneNoneApr-Augchenopod scrub, valley and foothill grasslandclay, often gravelly330860yesFresno, San BenitoLillis Ranch (338B) 3612044, Joaquin Rocks (338C) 3612034, Ciervo Mtn. (339A) 3612045, Tumey Hills (361C) 3612056, Mercy Hot Springs (362A) 3612067, Cerro Colorado (362B) 3612068, Llanada (362C) 3612058, Panoche (362D) 3612057Possibly threatened by non-native plants. See Phytotaxa 347(1):81-88 (2018) for original description.Navarretia panochensis D.Gowen & L.A.Johnson?12/31/201912/31/2019
Navarretia prostrata1B.1 1B.2Threatened by development, vehicles, road maintenance, grazing, non-native plants, and feral pigsrecreational activities. See Proceedings of the American Academy of Arts and Sciences 17:223 (1881) for original description, and Pittonia 1:130 (1887) for revised nomenclature.8/27/2019
Nemacladus inyoensisBadger Flat threadplantCampanulaceaeannual herb1B.2G2S2NoneNoneMay-Junpinyon and juniper woodland, Mojavean desert scrub carbonate, standstone, and granitic; gravelly, rocky, scree, flats, and washes17352635yesInyo, MonoWildrose Peak (325D) 3611731, Santa Rosa Flat (327B) 3611746, Nelson Range (349C) 3611756, Mazourka Peak (372A) 3611881, Waucoba Spring (391C) 3711718, Cowhorn Valley (392A) 3711821, Uhlmeyer Spring (392B) 3711822, Waucoba Mtn. (392D) 3711811, Westgard Pass (412C) 3711832, Deep Springs Lake (412D) 3711831, Chalfant Valley (432D) 3711853 Discovered in 2010 by Steve Matson. Threatened by vehicles and mining; potentially threatened by road construction. See Madroño 67(1): 35-60 (2020) for original description.Nemacladus inyoensis Morin & T.J.Ayers?7/21/20207/21/2020
Opuntia basilaris var. treleasei120 1006/6/2019
Orobanche valida ssp. valida1250 103011/7/2019
Orthocarpus bracteosusrosy orthocarpusOrobanchaceaeannual herb2B.1G3S1NoneNoneJun-Sepmeadows and seeps10301850noOregon, Washington; British Columbia, CanadaPlumas(?), Lassen, Modoc, SiskiyouCrescent Mills (605C)(?) 4012018, Westwood East (623C) 4012038, Chester (624C)(?) 4012132, Lane Reservoir (676D) 4112017, City Of Mount Shasta (699D) 4112233, Weed (699B) 4112244, Davis Creek (708A) 4112063Possibly threatened by grazing, habitat alteration, non-native plants, and hydrological alterations. See Scrophularineae Indicae 13 (1835) for original description.Orthocarpus bracteosus Benth.PDSCR1H0309/4/202010/1/2020
Oxytropis oreophila var. juniperinamountain oxytropeFabaceaeperennial herb2B.1G5T4T5S1NoneNoneJunpinyon and juniper woodland21502150noNevada, UtahMonoCedar Hill (469A) 3811827Discovered in CA by A. Howald and A. Tiehm in 2016. Possibly threatened by trampling and non-native plants. See The Great Basin Naturalist 38(3):339 (1978) for original description, and Madroño 65(1):6 (2018) for information on discovery in CA. Oxytropis oreophila A. Gray var. juniperina S.L. Welsh PDFAB2X0H26/12/20209/28/2020
Packera indecora1450 160011/14/2019
Penstemon filiformis1B.3 4.2May-Aug (Sep)Possibly threatened by logging, road maintenance, and recreation. Confused with P. laetus var. sagittatus. See University of California Publications in Botany 16:394 (1932) for original description.
Changed from 1B.3 to 4.2 4.3 on 2020-05-07
More common than originally known. Possibly threatened by logging, road maintenance, and recreation. Reported to tolerate some types of disturbance. Confused with P. laetus var. sagittatus. See University of California Publications in Botany 16:394 (1932) for original description.
Penstemon sudans1B.2 4.3G3 G4S3 S4Oregon, NevadaKnown in CA only from the vicinity of Susanville. Threatened by road maintenance, vehicles, and non-native plants. Possibly threatened by logging. Changed from 1B.2 to 4.3 on 2020-03-02. More common than originally known and reported to respond well to certain types of disturbance. Potentially threatened by logging and road construction and maintenance. Possibly threatened by development, grazing, erosion, non-native plants, and vehicles. See Contributions to Western Botany 8:37 (1898) for original description.3/2/20203/2/2020
Phacelia keckiiMay-Jun Jul11/7/2019
Phacelia nashianaThreatened by grazing and mining. Possibly threatened by foot traffic and vehicles. See Flora of California 3(2):276-277 (1943) by W.L. Jepson for original description.6/6/2019
Phacelia sericea var. ciliosa1B.3 1B.26/24/2019
Piperia candidaDifficult to determine rarity as some populations rarely flower. Populations often have small numbers. Threatened by logging, foot traffic, and road construction. Difficult to identify from herbarium material. See Lindleyana 5(4):205-211 (1990) for original description, and The Wild Orchids of California, p. 109-110 (1995) by R. Coleman for species account.9/26/2019
Plagiobothrys chorisianus var. hickmanii15185 3908/2/2019
Sidalcea malviflora ssp. patula880 1,23011/7/2019
Sidalcea robustaMay7/11/2019
Silene occidentalis ssp. occidentalis1030 123012/19/2019
Silene verecunda ssp. verecundaJul7/11/2019
Spermolepis laterifloraBurbank (111A)(?) 34118237/10/2019
Sphaerocarpos drewei drewiae
Sphaerocarpos drewei drewiae Wigglesw.
Sphaerocarpos drewei (misapplied)6/5/2020
Sphenopholis interrupta ssp. californicaprairie false oatPoaceaeannual herb1B.1G1S1NoneNoneAprchaparral (coastal)friable clay lenses1515noBaja, CASan DiegoSan Luis Rey (036A) 3311723Discovered in CA in 2020 by M. Mulligan and J. Vinje; formerly thought to be a presumed extinct endemic to Baja CA, Mexico, where last seen in 1886. Threatened by non-native plants, development, and urbanization. See USDA Division of Botany, Bulletin 13(1): 46 (1892) for original description, and Rhodora 8(92):146 (1906) for revised nomenclature. Sphenopholis interrupta (Buckley) Scribn. ssp. californica (Vasey) Scribn.?9/3/20209/29/2020
Streptanthus anomalusMount Burdell jewelflower Brassicaceaeannual herb1B.1G1S1NoneNoneMay-Juncismontane woodland (grassy openings)serpentinite50150yesMarinPetaluma River (484A) 3812225Threatened by grazing and trampling. Potentially threatened by recreational activities. Similar to S. glandulosus and S. tortuosus; distinguished by conspicuous ovate, deeply clasping distal leaves that bract the inflorescence below or above the proximal flower. See Madroño 66(1):24-29 (2019) for original description. Streptanthus anomalus D.L.Smith, A.Arthur, & R.E.Preston?8/21/20198/21/2019
Streptanthus juneaeJune's jewelflowerBrassicaceaeperennial herb1B.2G1S1NoneNoneJun-Auglower montane coniferous forest, chaparral (montane)openings21552370yesSan BernardinoBig Bear Lake (105B) 3411628Potentially threatened by road maintenance, vehicles, and recreational activities. Previously identified as S. campestris; differentiated in lacking uniformly dark purple sepals (vs. uniformly dark purple sepals), lack of dense cluster of fertile flowers at apex of inflorescence (vs. dense cluster), less than 0.5 m tall (vs. often taller than 1 m), leaves appearing thick, coriaceous (vs. leaves appearing thin), basal leaf petioles without ciliate margins (vs. often with ciliate margins), and endemic to San Bernardino Mtns. (vs. southeastern foothills of the San Bernardino Mtns. south to Baja CA, Mexico in S. campestris). See Madroño 67(1):19-34 (2020) for original description.Streptanthus juneae Jensen ?12/9/202012/17/2020