Elevation Low (ft)

Elevation High (m)

Elevation High (ft)

EO Possibly Extirpated

EO Extirpated

Full Scientific Name

Element Code

USDA PLANTS Symbol

Date Changed

Adelaida (3512067), Lime Mountain (3512068), San Simeon (3512162), Burnett Peak (3512172), Burro Mountain (3512173), Alder Peak (3512183), Cape San Martin (3512184), Cone Peak (3612114), Lopez Point (3612115), Junipero Serra Peak (3612124), Tassajara Hot Springs (3612125), Partington Ridge (3612126), Pfeiffer Point (3612127), Sycamore Flat (3612134), Chews Ridge (3612135), Ventana Cones (3612136), Big Sur (3612137)

Known only from the Santa Lucia Mtns. Threatened by non-native plants. Possibly threatened by road maintenance.

Abies bracteata (D. Don) Poit.

Granitic, gravelly and sandy margins with Hulsea vestita and Lupinus breweri

Templeton Mtn. (3611832), Kern Peak (3611833)

Known from only Ramshaw Meadows and Templeton Meadows. Possibly threatened by trampling and potentially threatened by meadow succession. Previously a candidate for federal listing. See Botanical Gazette 27:444-457 (1899) for original description, and Aliso 7(2):201-205 (1970) for discussion of rediscovery.

Abronia alpina Bdg.

DNT, HUM, MEN, MRN, SON

Inverness (3812217), Drakes Bay (3812218), Tomales (3812228), Bodega Head (3812331), Point Arena (3812386), Mendocino (3912337), Fort Bragg (3912347), Inglenook (3912357), Westport (3912367), Fields Landing (4012462), Cannibal Island (4012463), Eureka (4012472), Arcata North (4012481), Tyee City (4012482), Crannell (4112411), Rodgers Peak (4112421), Orick (4112431), Fern Canyon (4112441), Requa (4112451), Sister Rocks (4112462), Crescent City (4112472)

Most occurrences have few plants. Threatened by vehicles, non-native plants, and foot traffic. State-listed as Endangered in OR.

Abronia umbellata Lam. var. breviflora (Standl.) L.A. Galloway

Abronia umbellata ssp. breviflora

PDNYC010N4

IMP, LAX, ORA, RIV, SBD, SDG, VEN

Calexico (3211564), Seeley (3211576), Superstition Mtn. (3211587), Agua Caliente Springs (3211683), Iris (3311524), Durmid (3311547), Salton (3311548), Mortmar (3311558), Desert Center (3311564), Cottonwood Basin (3311568), East of Victory Pass (3311573), Earthquake Valley (3311614), Tubb Canyon (3311624), Ranchita (3311625), Collins Valley (3311644), Bucksnort Mtn. (3311645), Aguanga (3311647), Vail Lake (3311648), Valerie (3311652), Butterfly Peak (3311655), Anza (3311656), Sage (3311658), Thermal Canyon (3311661), Indio (3311662), La Quinta (3311663), Palm View Peak (3311665), Idyllwild (3311666), Blackburn Canyon (3311667), Hemet (3311668), Myoma (3311673), Cathedral City (3311674), Palm Springs (3311675), Lake Fulmor (3311677), San Jacinto (3311678), East Deception Canyon (3311683), Desert Hot Springs (3311685), White Water (3311686), Cabazon (3311687), Beaumont (3311688), Morro Hill (3311733), Pechanga (3311741), Temecula (3311742), Fallbrook (3311743), Bachelor Mtn. (3311751), Murrieta (3311752), Winchester (3311761), Alberhill (3311764), Newport Beach (3311768), Lakeview (3311771), Perris (3311772), Lake Mathews (3311774), Corona South (3311775), Black Star Canyon (3311776), Orange (3311777), Anaheim (3311778), Riverside East (3311783), Corona North (3311785), Vidal (3411415), Lovejoy Buttes (3411757), Barstow (3411781), Hinkley (3411782), Oxnard (3411922)

Threatened by non-native plants, alteration of fire regimes, road maintenance, flood control activities, vehicles, and development. See Bulletin of the Torrey Botanical Club 32(10):537 (1905) for original description, Flora of California 1:455 (1914) by W.L. Jepson for revised nomenclature, and Brittonia 27(4):340 (1995) for taxonomic treatment.

Abronia villosa Wats. var. aurita (Abrams) Jeps.

Palo Alto (3712242), Woodside (3712243), San Mateo (3712253)

One historical occurrence has been extirpated. Seriously threatened by development, non-native plants, vehicles, and vandalism. USFWS uses the name Acanthomintha obovata ssp. duttonii. See Illustrated Flora of the Pacific States 3:635 (1951) by L. Abrams for original description, and Madroño 38(4):278-286 (1991) for revised nomenclature.

Acanthomintha duttonii (Abrams) Jokerst

Acanthomintha obovata ssp. duttonii

PDLAM01040

Tecate (3211656), Otay Mesa (3211658), Dulzura (3211667), Jamul Mountains (3211668), Viejas Mountain (3211676), Alpine (3211677), El Cajon (3211678), El Cajon Mtn. (3211687), San Vicente Reservoir (3211688), Imperial Beach (3211751), National City (3211761), Point Loma (3211762), La Mesa (3211771), La Jolla (3211772), Poway (3211781), Del Mar (3211782), Ramona (3311617), San Pasqual (3311618), Escondido (3311711), Rancho Santa Fe (3311712), Encinitas (3311713), San Marcos (3311722), San Luis Rey (3311723)

Approximately one third of the historical occurrences in CA have been extirpated; threatened by urbanization, road construction, vehicles, grazing, trampling, foot traffic, recreactional activities, erosion, and non-native plants. Several occurrences introduced (22B, 34C, 35B, 36D), but few have survived. See Proceedings of the American Academy of Arts and Sciences 8:368 (1872) for original description.

Acanthomintha ilicifolia (Gray) Gray

Devils Heart Peak (3411858), Topatopa Mountains (3411951), Reyes Peak (3411963), Big Pine Mtn. (3411966), San Rafael Mtn. (3411967), Figueroa Mtn. (3411968), Cuddy Valley (3411971), Sawmill Mountain (3411972)

See Bulletin of the Torrey Botanical Club 36: 605 (1909) for original description, Harvard Papers in Botany 9(1): 144 (2004) for revised nomenclature, and Brittonia 32(1): 70-102 (1980) and Phytologia 66(4): 386-87 (1989) for taxonomic treatments.

Acanthoscyphus parishii (Parry) Small var. abramsii (E.A. McGregor) Reveal

Oxytheca parishii var. abramsii

PDPGN0J041

Joshua tree woodland, Pinyon and juniper woodland, Upper montane coniferous forest (sandy, granitic)

Onyx Peak (3411626), Moonridge (3411627), Rattlesnake Canyon (3411636)

Known from approximately six occurrences. Possibly threatened by logging, mining, road maintenance, and vehicles. See Brittonia 32: 70-102 (1980) for original description, Harvard Papers in Botany 9(1): 144 (2004) for revised nomenclature, and Phytologia 66(4): 386-387 (1989) for taxonomic treatment.

Acanthoscyphus parishii (Parry) Small var. cienegensis (Ertter) Reveal

Oxytheca parishii var. cienegensis

PDPGN0J042

Onyx Peak (3411626), Rattlesnake Canyon (3411636), Big Bear City (3411637), Fawnskin (3411638), Butler Peak (3411731), Fifteenmile Valley (3411741)

Threatened by carbonate mining, non-native plants, powerline maintenance, and vehicles. See Brittonia 32: 70-102 (1980) for original description, Harvard Papers in Botany 9(1): 144 (2004) for revised nomenclature, and Phytologia 66(4): 386-387 (1989) for taxonomic treatment.

Acanthoscyphus parishii (Parry) Small var. goodmaniana (Ertter) Reveal

Oxytheca parishii var. goodmaniana

PDPGN0J043

San Clemente Island South (3211873), San Clemente Island Central (3211874), San Clemente Island North (3211885)

Threatened by Navy activities. Feral herbivores removed from SCM Isl., and vegetation recovering. See Bulletin of the Southern California Academy of Sciences 39:175 (1940) for original description.

Acmispon argophyllus (A. Gray) Brouillet var. adsurgens (Dunkle) Brouillet

Lotus argophyllus var. adsurgens

Columbia Mtn. (3511514), Pinto Valley (3511523), Hart Peak (3511531), Castle Peaks (3511532), Ivanpah (3511533), Mescal Range (3511545)

See University of California Publications in Botany 10:211 (1923) for original description, and Memoirs of the New York Botanical Garden 25:128-206 (1981) for taxonomic treatment.

Acmispon argyraeus (Greene) Brouillet var. multicaulis (Ottley) Brouillet

Lotus argyraeus var. multicaulis

Fountain Peak (3411585), Kelso Dunes (3411586)

Known only from one occurrence in the Providence Mtns. See Brittonia 30(4):466-472 (1978) for original description, and Memoirs of the New York Botanical Garden 25:128-206 (1981) for taxonomic treatment.

Acmispon argyraeus (Greene) Brouillet var. notitius (Isely) Brouillet

Lotus argyraeus var. notitius

San Clemente Island South (3211873), San Clemente Island Central (3211874), San Clemente Island North (3211885)

Feral herbivores removed from SCM Isl., and vegetation recovering. Occasionally hybridizes with A. argophyllus var. argenteus. See Brittonia 30:466-472 (1978) for revised nomenclature.

Acmispon dendroideus (Greene) Brouillet var. traskiae (Eastw. ex Abrams) Brouillet

Lotus dendroideus var. traskiae, Lotus scoparius ssp. traskiae

In-ko-pah Gorge (3211661), Jacumba (3211662), Sombrero Peak (3211673), Agua Caliente Springs (3211683), Monument Peak (3211684), Whale Peak (3311613), Earthquake Valley (3311614), Tubb Canyon (3311624), Borrego Palm Canyon (3311634), Toro Peak (3311654), Palm Springs (3311675)

Possibly threatened by vehicles and non-native plants. See West American Scientist 6:63 (1889) for original description, Pittonia 2:149 (1890) for revised nomenclature, and Memoirs of the New York Botanical Garden 25:128-206 (1981) for taxonomic treatment.

Acmispon haydonii (Orcutt) Brouillet

Lotus haydonii

Imperial Beach (3211751), National City (3211761), Point Loma (3211762), La Jolla (3211772), Del Mar (3211782), Encinitas (3311713), San Luis Rey (3311723), Oceanside (3311724)

Threatened by development, non-native plants, and land management activities; particularly by U.S. Navy at Silver Strand and Imperial Beach. Possibly threatened by foot traffic, vehicles, and illegal dumping.

Acmispon prostratus (Torr. & A. Gray) Brouillet

Lotus nuttallianus

COL, STA, TEH

Copper Mtn. (3712143), Mt. Boardman (3712144), Lodoga (3912234), Gilmore Peak (3912235), Hall Ridge (3912276), Dales (4012231)

Known from only four disjunct occurrences. Threatened by development, and probably by grazing and non-native plants. Field work needed. See Madroño 6(2):56 (1941) for original description.

Acmispon rubriflorus (Sharsm.) D.D. Sokoloff

Lotus rubriflorus

Tecopa Pass (3511671), North of Tecopa Pass (3511681), Twelvemile Spring (3611612)

Known in CA only from the Nopah Range. See A. utahensis in The Jepson Manual (1993). On watch list in NV. See Cactus and Succulent Journal 14:131 (1943) for original description and 32:20 (1960) for revised nomenclature.

Agave utahensis (Englem.) Gentry var. eborispina (Hester) Breitung

PMAGA010S1

Devils Rock (4012271), Minnesota Mtn. (4012272), O'Brien (4012273), Goose Gap (4012281), Bollibokka Mtn. (4012282), Hanland Peak (4012283), Grizzly Peak (4112128), Shoeinhorse Mtn. (4112211), Yellowjacket Mtn. (4112212), Tombstone Mtn. (4112213), Lake McCloud (4112221)

Threatened by mining. See Madroño 25(4):218-220 (1978) for original description.

Ageratina shastensis (D.W. Taylor & Steb.) R.M. King & H. Robinson

Eupatorium shastense

PDASTBX0R0

MEN, MNT, MRN, SCR, SMT, SON

Point Sur (3612138), Santa Cruz (3612281), Davenport (3712212), Ano Nuevo (3712213), Franklin Point (3712223), Pigeon Point (3712224), Montara Mountain (3712254), Inverness (3812217), Drakes Bay (3812218), Tomales (3812228), Valley Ford (3812238), Bodega Head (3812331), Duncans Mills (3812341), Fort Ross (3812352), Plantation (3812353), Stewarts Point (3812364), Gualala (3812375), Saunders Reef (3812376), Point Arena (3812386), Elk (3912326), Albion (3912327), Mendocino (3912337), Fort Bragg (3912347), Westport (3912367)

Historical occurrences need field surveys. Threatened by agriculture, recreation, development, and competition from non-native plants. Includes A. blasdalei var. marinensis, which is state-listed Rare.

Agrostis blasdalei Hitchc.

Agrostis blasdalei var. blasdalei, Agrostis blasdalei var. marinensis

PMPOA04060

Los Olivos (3412061), Zaca Creek (3412062), Lompoc (3412064), Surf (3412065), Sisquoc (3412073), Orcutt (3412074), Casmalia (3412075), Oceano (3512015), Tar Spring Ridge (3512024), Arroyo Grande NE (3512025), Pismo Beach (3512026), Port San Luis (3512027), Santa Margarita Lake (3512034), Lopez Mtn. (3512035), Morro Bay South (3512037), Adelaida (3512067)

Threatened by development, vegetation clearing, and non-native plants.

Agrostis hooveri Swall.

PMPOA040M0

Spreckels (3612156), Seaside (3612157), Salinas (3612166), Marina (3612167)

Known only from Butterfly Valley and Machine Gun Flats of Ft. Ord National Monument. Possibly threatened by non-native plants, road construction, vehicles, grazing, and hydrological alterations. Similar to A. blasdalei, A. densiflora, and A. variabilis. Not in TJM 2. See Journal of the Botanical Research Institute of Texas 5(2):421-426 (2011) for original description.

Agrostis lacuna-vernalis P.M. Peterson & Soreng

PMPOA041N0

FRE, MAD, TUL

Durrwood Creek (3611814), Solo Peak (3611816), Hockett Peak (3611824), Mineral King (3611845), Silver City (3611846), Triple Divide Peak (3611855), Lodgepole (3611856), Muir Grove (3611867), Wren Peak (3611877), Ward Mountain (3711828), Florence Lake (3711838), Dinkey Creek (3711912), Shaver Lake (3711913), Auberry (3711914), Huntington Lake (3711922), Musick Mtn. (3711923), Mt. Givens (3711931), Mammoth Pool Dam (3711933), Shuteye Peak (3711934), Bass Lake (3711935)

Plants from the Kings River Canyon area are threatened by foot traffic, and potentially threatened by road maintenance and mining. See Plant Life 28:63-64 (1972) for original description, and Aliso 13(3):411-426 (1992) for taxonomic treatment.

Allium abramsii (Ownbey & Aase ex Traub) McNeal

Closed-cone coniferous forest, Chaparral (maritime), Coastal prairie, Coastal scrub, Valley and foothill grassland

Pico Creek (3512152), San Simeon (3512162), Piedras Blancas (3512163), Burro Mountain (3512173), Cape San Martin (3512184), Seaside (3612157), Monterey (3612158), Salinas (3612166), Marina (3612167)

Threatened by urbanization, grazing, non-native plants, trampling, road construction, and military activities. See Bulletin of the Torrey Botanical Club 30:483-502 (1903) for original description.

Allium hickmanii Eastw.

KRN, LAX, SBA, SBD, VEN

Lake Arrowhead (3411732), Warm Springs Mountain (3411855), Liebre Mtn. (3411866), Black Mtn. (3411867), Frazier Mtn. (3411878), Wheeler Springs (3411953), Lockwood Valley (3411961), San Guillermo (3411962), Reyes Peak (3411963), Cuddy Valley (3411971), Sawmill Mountain (3411972), Apache Canyon (3411973), Cuyama Peak (3411974), Hurricane Deck (3411977), Ballinger Canyon (3411984), New Cuyama (3411986), Tehachapi South (3511814)

Threatened by mining, road maintenance, and vehicles. Possibly threatened by grazing and trampling.

Allium howellii Eastw. var. clokeyi Traub

FRE, MNT, SBT

Priest Valley (3612026), Monarch Peak (3612027), San Benito Mtn. (3612036), Ciervo Mtn. (3612045), Idria (3612046), Monocline Ridge (3612055), Tumey Hills (3612056), Panoche (3612057), Mercey Hot Springs (3612067)

Possibly threatened by grazing and development. See Herbertia 12:68 (1945) for original description, and Plant Life 28:66 (1972) and Flora of North America 26:251 (2003) for revised nomenclature.

Allium howellii Eastw. var. sanbenitense (Traub) McNeal & T.D. Jacobsen

BUT, ELD, PLA, TUO

Tuolumne (3712082), Sonora (3712084), Shingle Springs (3812068), Auburn (3812181), Berry Creek (3912164), Cherokee (3912165), Pulga (3912174), Paradise East (3912175), Stirling City (3912185)

See Plant Life 28:63 (1972) for original description, and Madroño 36(2):122-130 (1989) for revised nomenclature.

Allium jepsonii (Traub) Denison & D. McNeal

Beaumont (3311688), El Casco (3311781), Forest Falls (3411618)

Known only from the Yucaipa and Beaumont area of the southern San Bernardino Mtns. Threatened by non-native plants, urbanization and alteration of fire regimes. Not in TJM (1993). See Bulletin of the Southern California Academy of Sciences 20:49 (1921) for original description.

Allium marvinii A. Davids.

Chaparral, Cismontane woodland, Coastal scrub, Pinyon and juniper woodland, Valley and foothill grassland

Bachelor Mtn. (3311751), Wildomar (3311753), Winchester (3311761), Romoland (3311762), Lake Elsinore (3311763), Alberhill (3311764), Steele Peak (3311773), Lake Mathews (3311774), Corona South (3311775)

Threatened by development, clay mining, agriculture, grazing, vehicles, and non-native plants. Cleveland NF has adopted species management guidelines.

Allium munzii (Traub) D. McNeal

Allium fimbriatum var. munzii

MEN, NAP, SCL, SMT, SON

Palo Alto (3712242), Woodside (3712243), San Mateo (3712253), Montara Mountain (3712254), Petaluma (3812226), Napa (3812233), Sonoma (3812234), Kenwood (3812245), Bodega Head (3812331), Cloverdale (3812371)

Threatened by development, foot traffic, non-native plants, and trail maintenance. See Phytologia 73(4):310 (1992) for original description.

Allium peninsulare Lemmon var. franciscanum D. McNeal & Ownbey

ALA, SCL, STA

Copper Mtn. (3712143), Mt. Boardman (3712144), Eylar Mtn. (3712145), Cedar Mtn. (3712155)

Known only from the Mt. Hamilton Range.

Allium sharsmithiae (Ownbey & Aase) McNeal

Allium fimbriatum var. sharsmithiae, Allium sharsmithae

Ninemile Canyon (3511778), Tehachapi NE (3511823), Cinco (3511831), Cross Mountain (3511832), Emerald Mtn. (3511833), Lamont Peak (3511871)

Known from fewer than 10 occurrences. Threatened by renewable energy development. See Madroño 34(2):150-154 (1987) for original description.

Allium shevockii D. McNeal

ALP, AMA, CAL, ELD, TUO

Cherry Lake South (3711988), Piute Mtn. (3811915), Tiltill Mtn. (3811916), Pinecrest (3811928), Dardanelle (3811937), Hull Creek (3812011), Twain Harte (3812012), Strawberry (3812021), Crandall Peak (3812022), Stanislaus (3812023), Liberty Hill (3812031), Boards Crossing (3812032), Tamarack (3812041), Garnet Hill (3812043), Devils Nose (3812044), Peddler Hill (3812053)

Threatened by vehicles. See Report of the Pacific Railroad Expedition 4:148 (1857) for original description, and Aliso 11(1):27-35 (1985) for revised treatment.

Allium tribracteatum Torr.

Moccasin (3712073), Chinese Camp (3712074), Sonora (3712084), New Melones Dam (3712085)

Known from approximately twenty occurrences. Threatened by grazing, foot traffic, urbanization, road maintenance, and vehicles. See Plant Life 28:63 (1972) for original description, and Madroño 36(2):122-130 (1989) for revised nomenclature.

Allium tuolumnense (Traub) Denison & D. McNeal

Allium sanbornii var. tuolumnense

Mariposa Grove (3711955), Wawona (3711956), Buckingham Mtn. (3711957), El Capitan (3711966), El Portal (3711967), Ascension Mtn. (3711978)

Known from fewer than twenty occurrences. Possibly threatened by recreational activities. See Leaflets of Western Botany 1:132-133 (1934) for original description, Fremontia 8(1):15-18 (1980) for information on rediscovery, and Aliso 11(1):27-35 (1985) for taxonomic treatment.

Allium yosemitense Eastw.

Bolinas (3712286), Inverness (3812217), Drakes Bay (3812218), Two Rock (3812237), Kenwood (3812245), Sebastopol (3812247), Camp Meeker (3812248), Duncans Mills (3812341)

Two occurrences introduced in 1987 (485C, 485D), but both appear to have failed as of 1993. Historical localities need field surveys. Threatened by cattle trampling, wetland habitat loss, and non-native plants. See A. aequalis in The Jepson Manual.

Alopecurus aequalis Sobol. var. sonomensis Rubtzoff

PMPOA07012

sandy loam or clay, often in disturbed areas, sometimes alkaline

Barrett Lake (3211666), Jamul Mountains (3211668), El Cajon (3211678), Imperial Beach (3211751), National City (3211761), La Mesa (3211771), La Jolla (3211772), Del Mar (3211782), Aguanga (3311647), Escondido (3311711), Rancho Santa Fe (3311712), San Marcos (3311722), San Luis Rey (3311723), Oceanside (3311724), Bonsall (3311732), Temecula (3311742), Bachelor Mtn. (3311751), Murrieta (3311752), Lake Elsinore (3311763), Alberhill (3311764), Riverside West (3311784)

Threatened by development, non-native plants, vehicles, road maintenance, and foot traffic. Confused with A. confertiflora, but the two are quite distinct. See Madroño 39(2):157 (1992) for first RIV Co. record.

Ambrosia pumila (Nutt.) Gray

PDAST0C0M0

LAK, MNT, MRN, NAP, SON

Chews Ridge (3612135), San Rafael (3712285), Bolinas (3712286), San Geronimo (3812216), Petaluma River (3812225), Petaluma (3812226), Napa (3812233), Sonoma (3812234), Glen Ellen (3812235), Cotati (3812236), Rutherford (3812244), Kenwood (3812245), Santa Rosa (3812246), Camp Meeker (3812248), Chiles Valley (3812253), St. Helena (3812254), Calistoga (3812255), Mark West Springs (3812256), Healdsburg (3812257), Guerneville (3812258), Aetna Springs (3812264), Detert Reservoir (3812265), Mount St. Helena (3812266), Bodega Head (3812331), Duncans Mills (3812341), Cazadero (3812351), Fort Ross (3812352)

Threatened by development and habitat alteration. Potentially threatened by road maintenance. See Manual of the Flowering Plants of California, p. 556 (1925) by W.L. Jepson for original description, and Rhodora 77:348-350 (1975) for taxonomic treatment.

Amorpha californica Nutt. var. napensis Jeps.

ALA, CCA, SJQ

Lone Tree Creek (3712154), Tracy (3712164), Midway (3712165), Tassajara (3712177), Antioch South (3712187)

Reduced by agriculture, development, and grazing; currently threatened by non-native plants and possibly by trampling and altered fire frequency. Recent reintroductions have occurred (444C, 464A, 464D) as part of State and Federal recovery work, but all declining as of 2000. See Botany of California 1:525 (1876) for original description, and Conservation Biology 7(3):510-526 (1993) for population biology.

Amsinckia grandiflora (Gray) Greene

ALA, CCA, COL, LAK, MRN, NAP, SBT, SCL, SCR, SMT, SON, SUT, YOL

Lonoak (3612038), Laurel (3712118), Los Gatos (3712128), Lick Observatory (3712136), Altamont (3712166), Davenport (3712212), Ano Nuevo (3712213), Palo Alto (3712242), San Mateo (3712253), Montara Mountain (3712254), Hayward (3712261), San Francisco South (3712264), Las Trampas Ridge (3712271), Oakland East (3712272), Oakland West (3712273), Walnut Creek (3712281), Briones Valley (3712282), San Rafael (3712285), Bolinas (3712286), San Geronimo (3812216), Point Reyes NE (3812227), Tomales (3812228), Rutherford (3812244), Santa Rosa (3812246), Aetna Springs (3812264), Knoxville (3812273), Jericho Valley (3812274), Middletown (3812275), Whispering Pines (3812276), Rumsey (3812282), Glascock Mtn. (3812283), Wilson Valley (3812284), Lower Lake (3812285), Kelseyville (3812287), Highland Springs (3812288), Bodega Head (3812331), Sanborn Slough (3912138), Salt Canyon (3912213), Wilbur Springs (3912214), Benmore Canyon (3912215), Lucerne (3912217), Lakeport (3912218), Leesville (3912224), Hough Springs (3912225), Upper Lake (3912228), Sites (3912233), Lodoga (3912234), Gilmore Peak (3912235), St. John Mtn. (3912246)

Many collections old; current status information needed. Does plant occur in SHA and SIS counties? Threatened by development and mining. Possibly threatened by non-native plants.

Amsinckia lunaris Macbr.

PDBOR01070

Solvang (3412052), Santa Rosa Hills (3412053), Los Alamos (3412063), Lompoc (3412064), Surf (3412065)

Known only from the recent type locality and one ambiguous historical collection, all in the Santa Ynez River drainage. Not in The Jepson Manual. See Novon 14(4):464 (2004) for original description.

Ancistrocarphus keilii Morefield

PDASTD5020

COL, HUM, LAK, MEN, SHA, TEH, TRI

Crockett Peak (3912247), Hull Mountain (3912258), Mendocino Pass (3912278), Buck Rock (3912288), Sanhedrin Mtn. (3912351), Brushy Mtn. (3912352), Leech Lake Mtn. (3912381), South Yolla Bolly (4012217), Solomon Peak (4012218), North Yolla Bolly (4012228), Black Lassic (4012335), Skunk Ridge (4112117), Grizzly Peak (4112128), Tangle Blue Lake (4112226), Billys Peak (4112227)

Need quads for GLE Co. A synonym of Raillardiopsis scabrida in TJM (1993). See Bulletin of the Torrey Botanical Club 32:216 (1905) for original description, and Novon 9:462-471 (1999) for revised nomenclature.

Anisocarpus scabridus (Eastw.) B.G. Baldwin

Raillardiopsis scabrida

PDASTDU020

Serpentinite, rocky or gravelly; usually north-facing slopes with late spring snowpack

Siligo Peak (4012288)

Possibly threatened by climate change. Previously identified as A. lanata, a plant that does not occur in CA. Not included in TJM (1993) or TJM 2. See Systematic Botany 40(2):620-626 (2015) for original description.

Antennaria sawyeri R.J. Bayer and P.F. Figura

PDAST0H1S0

ANA, LAX, ORA, SBA, SBR, SCM, SCT, SCZ, SDG, SNI, SRO, VEN

Imperial Beach (3211751), National City (3211761), Point Loma (3211762), La Jolla (3211772), Del Mar (3211782), San Clemente Island South (3211873), San Clemente Island Central (3211874), San Clemente Island North (3211885), San Onofre Bluff (3311735), Dana Point (3311746), Laguna Beach (3311757), Newport Beach (3311768), Santa Catalina East (3311833), Santa Catalina South (3311834), Santa Catalina North (3311844), Santa Catalina West (3311845), Santa Barbara Island (3311848), San Pedro (3311863), Redondo Beach (3311874), San Nicolas Island (3311924), Anacapa Island (3311983), Santa Cruz Island A (3311987), Santa Rosa Island South (3312071), Ventura (3411933), Casmalia (3412075), Point Sal (3412086)

In steep decline on mainland, and also declining on islands. May occur on ANA Island. Threatened by urbanization, recreational development, foot traffic, and non-native plants. Threatened by feral herbivores on SCT, SCZ, and SRO Islands.

Aphanisma blitoides Moq.

DNT, MEN, SIS, TRI

Noble Butte (3912386), Preston Peak (4112375), Devils Punchbowl (4112376), Gasquet (4112378), Polar Bear Mtn. (4112385), Broken Rib Mtn. (4112386), Shelly Creek Ridge (4112387), High Plateau Mtn. (4112388), High Divide (4112481)

Potentially threatened by mining. Endangered in OR, where plant needs taxonomic study. Includes A. serpentinicola. See Rhodora 43(511):350 (1941) for taxonomic treatment, and Contributions from the Gray Herbarium 204:149-154 (1973) for taxonomic information.

Arabis mcdonaldiana Eastw.

Arabis macdonaldiana

South Lake Tahoe (3811988), Tahoe City (3912022), Martis Peak (3912031)

Threatened by logging and fuel reduction projects. On watch list in NV. Not in TJM (1993) and TJM 2. See Journal of the Arnold Arboretum 64:498 (1983) for original description, and Novon 13(4):381-391 (2003) for revised nomenclature.

Arabis rigidissima Rollins var. demota Rollins

Thurston Peaks (4012382), Whisky Bill Peak (4112215), Eaton Peak (4112238), Dees Peak (4112313), English Peak (4112342)

Similar to Boechera suffrutescens. See Boechera rigidissima in TJM 2; varieties not treated. See Rhodora 43(511):380-381 (1941) for original description, and Novon 13(4):381-391 (2003) for revised nomenclature.

Arabis rigidissima Rollins var. rigidissima

SCL, SCR, SMT

Watsonville East (3612186), Watsonville West (3612187), Soquel (3612188), Santa Cruz (3612281), Mt. Madonna (3712116), Loma Prieta (3712117), Laurel (3712118), Felton (3712211), Davenport (3712212), Big Basin (3712222), Franklin Point (3712223), La Honda (3712233), Woodside (3712243)

Confused with other species merged with it as varieties. Threatened by development and road maintenance. See Proceedings of the American Academy of Arts and Sciences 11:83 (1876) for original description, and North American Flora 29:98 (1914) for additional information.

Arctostaphylos andersonii Gray

Tassajara (3712177), Diablo (3712178), Antioch South (3712187), Clayton (3712188)

Known from fewer than twenty occurrences. Threatened by road maintenance. See Bulletin of the Torrey Botanical Club 32:202 (1905) for original description, and American Midland Naturalist 23:622 (1940) for taxonomic treatment.

Arctostaphylos auriculata Eastw.

Sonoma (3812234), Camp Meeker (3812248), Jimtown (3812267), Duncans Mills (3812341)

Known from fewer than ten occurrences. Threatened by development, road construction and widening, non-native plants, and dumping. See Leaflets of Western Botany 1:115 (1934) for original description.

Arctostaphylos bakeri Eastw. ssp. bakeri

Guerneville (3812258), Cazadero (3812351), Fort Ross (3812352), Warm Springs Dam (3812361), Tombs Creek (3812362)

See Four Seasons 8(2):63 (1988) for original description.

Arctostaphylos bakeri Eastw. ssp. sublaevis Wells

Santa Catalina East (3311833), Santa Catalina South (3311834), Santa Catalina North (3311844), Santa Catalina West (3311845)

Recovering after removal of feral goats. See Madroño 19(6):193 (1968) for original description.

Arctostaphylos catalinae Wells

Santa Rosa Island East (3311988), Santa Rosa Island South (3312071), Santa Rosa Island North (3312081)

Fewer than 400 plants were estimated to occur as of 1996. Threatened by cattle grazing and feral herbivores. See Leaflets of Western Botany 1:122 (1934) for original description.

Arctostaphylos confertiflora Eastw.

Lompoc Hills (3412054), Los Alamos (3412063), Lompoc (3412064), Surf (3412065), Point Sal (3412086)

Threatened by urbanization. See Madroño 19(6):197 (1968) for original description.

Arctostaphylos crustacea Eastw. ssp. eastwoodiana (P.V. Wells) V.T. Parker, M.C. Vasey & J.E. Keeley

Arctostaphylos tomentosa ssp. eastwoodiana

Broadleafed upland forest, Coastal bluff scrub, Closed-cone coniferous forest, Chaparral, Coastal scrub, Valley and foothill grassland

Port San Luis (3512027), Morro Bay South (3512037), Cambria (3512151), San Simeon (3512162), Piedras Blancas (3512163), Cape San Martin (3512184)

Possibly threatened by development and grazing. Potentially threatened by frequent wildfires and fire suppression activities. See Leaflets of Western Botany 9:218 (1962) for original description.

Arctostaphylos cruzensis Roof

Sebastopol (3812247)

Known from fewer than 5 occurrences. Threatened by fungal infection. See Leaflets of Western Botany 1(4):31 (1932) for original description.

Arctostaphylos densiflora M.S. Baker

Pfeiffer Point (3612127), Big Sur (3612137), Point Sur (3612138), Soberanes Point (3612148)

Threatened by foot traffic and non-native plants. Includes A. edmundsii var. parvifolia, which is state-listed Rare. See Leaflets of Western Botany 6(10):202 (1952) for original description and 9(12):188-196 (1961) for information.

Arctostaphylos edmundsii J.T. Howell

Arctostaphylos edmundsii var. edmundsii, Arctostaphylos edmundsii var. parvifolia

San Francisco South (3712264), San Francisco North (3712274)

Single plant rediscovered in 2009. Previously considered extinct since 1947. Seriously threatened by road construction. See Bulletin of the Torrey Botanical Club 32:201 (1905) for original description, and Madrono 54(2): 148-155 (2007) for revised nomenclature.

Arctostaphylos franciscana Eastw.

Arctostaphylos hookeri ssp. franciscana

Mount Johnson (3612153), Mt. Harlan (3612164)

Known only from two occurrences in the Gabilan Mountains. Not in The Jepson Manual. See Madroño (51)3: 322 (2004) for original description.

Arctostaphylos gabilanensis V.T. Parker & M.C. Vasey

La Mesa (3211771), Poway (3211781), Del Mar (3211782), Rancho Santa Fe (3311712), Encinitas (3311713), San Marcos (3311722), San Luis Rey (3311723)

Threatened by urbanization, agricultural conversion, and fuel modification. CA populations have declined greatly. Reported to intergrade with ssp. zacaensis. See Madroño 1(4):86 (1922) for original description, Madroño 19:205 (1968) for revised nomenclature, and Four Seasons 7(4):5-27 (1987) for taxonomic treatment.

Arctostaphylos glandulosa Eastw. ssp. crassifolia (Jeps.) Wells

LAX, SBA, SBD

Cucamonga Peak (3411725), Mt. Baldy (3411726), Mount San Antonio (3411736), Crystal Lake (3411737), Waterman Mtn. (3411738), Juniper Hills (3411748), Mt. Wilson (3411821), Chilao Flat (3411831), Condor Peak (3411832), Pacifico Mountain (3411841), Peak Mountain (3411987), Bates Canyon (3411988), Manzanita Mtn. (3412081), Taylor Canyon (3511918), Miranda Pine Mtn. (3512011)

Known only from Mill Creek Summit divide in the San Gabriel Mtns. Threatened by powerline construction. See Four Seasons 9(2):46 (1992) for original description.

Arctostaphylos glandulosa Eastw. ssp. gabrielensis (P.V. Wells) J.E. Keeley, M.C. Vasey & V.T. Parker

Arctostaphylos gabrielensis

Davenport (3712212), Ano Nuevo (3712213), Big Basin (3712222)

Known from fewer than ten occurrences. Threatened by road construction. See American Midland Naturalist 23:617 (1940) for original description.

Arctostaphylos glutinosa Schreib.

San Simeon (3512162), Piedras Blancas (3512163)

Known from five occurrences in the Arroyo de la Cruz area; need current status information. Threatened by grazing and rangeland conversion. See Four Seasons 2(1):2 (1966) for original description, and Madroño 19:200 (1968) for revised nomenclature.

Arctostaphylos hookeri D. Don ssp. hearstiorum (Hoov. & Roof) Wells

Arctostaphylos hearstiorum

Lopez Point (3612115), Soberanes Point (3612148), Spreckels (3612156), Seaside (3612157), Monterey (3612158), Salinas (3612166), Marina (3612167), Prunedale (3612176), Watsonville West (3612187)

Threatened by agriculture, development, fire suppression, and competition with Eucalyptus.

Arctostaphylos hookeri D. Don ssp. hookeri

San Francisco South (3712264)

Threatened by fungal infection, and possibly by alteration of fire regimes. All occurrences are within the boundaries of the San Bruno Mtn. HCP. See Proceedings of the California Academy of Sciences IV 20:149 (1931) for original description.

Arctostaphylos imbricata Eastw.

Chaparral (montane), Lower montane coniferous forest, Subalpine coniferous forest, Upper montane coniferous forest

Covington Mill (4012287), Siligo Peak (4012288), Chicken Hawk Hill (4112214), Whisky Bill Peak (4112215), Carrville (4112216), Ycatapom Peak (4112217), Seven Lakes Basin (4112224), Mumbo Basin (4112225), Tangle Blue Lake (4112226), South China Mtn. (4112235), Scott Mountain (4112236)

Threatened by logging and road maintenance. See Four Seasons 6(4):20 (1983) for original description.

Arctostaphylos klamathensis Edwards, Keeler-Wolf & Knight

Arroyo Grande NE (3512025), Lopez Mtn. (3512035), San Luis Obispo (3512036), Morro Bay South (3512037), Atascadero (3512046), Cypress Mountain (3512058), Lime Mountain (3512068)

Threatened by road maintenance and construction. See Leaflets of Western Botany 10:177 (1965) for original description.

Arctostaphylos luciana Wells

COL, GLE, HUM, LAK, MEN, NAP, SHA, SON, TEH, TRI

Detert Reservoir (3812265), Mount St. Helena (3812266), Middletown (3812275), Whispering Pines (3812276), The Geysers (3812277), Asti (3812278), Clearlake Highlands (3812286), Kelseyville (3812287), Highland Springs (3812288), Cloverdale (3812371), Clearlake Oaks (3912216), Lucerne (3912217), Lakeport (3912218), Bartlett Springs (3912226), Bartlett Mtn. (3912227), Gilmore Peak (3912235), Fouts Springs (3912236), Potato Hill (3912237), St. John Mtn. (3912246), Crockett Peak (3912247), Lake Pillsbury (3912248), Elk Creek (3912255), Felkner Hill (3912256), Chrome (3912265), Alder Springs (3912266), Newville (3912275), Hall Ridge (3912276), Riley Ridge (3912286), Covelo East (3912372), Covelo West (3912373), Tan Oak Park (3912375), Zenia (4012324), Pony Buck Peak (4012331), Smoky Creek (4012332), Dinsmore (4012345)

Possibly threatened by development, geothermal energy development, conversion to vineyards, vehicles, and road widening. See Erythea 1:15 (1893) for original description, Madroño 19(6):201 (1968) for revised nomenclature, and American Journal of Botany 27(3):186-190 for taxonomic discussion.

Arctostaphylos manzanita Parry ssp. elegans (Jeps.) Wells

Tassajara (3712177), Diablo (3712178), Antioch South (3712187), Clayton (3712188)

Threatened by road maintenance. Possibly threatened by fire suppression. See Leaflets of Western Botany 1:76 (1933) for original description, and Aliso 4(1):95 (1954) for revised nomenclature.

Arctostaphylos manzanita Parry ssp. laevigata (Eastw.) Munz

Arctostaphylos pungens ssp. laevigata

San Rafael (3712285), Bolinas (3712286), Novato (3812215), San Geronimo (3812216)

See Proceedings of the California Academy of Sciences 1:83 (1897) for original description, and Madroño 19(6):200 (1968) for revised nomenclature.

Arctostaphylos montana Eastw. ssp. montana

Arctostaphylos hookeri ssp. montana, Arctostaphylos montana

San Francisco South (3712264), San Francisco North (3712274)

Known from only one extant native occurrence at the Presidio in San Francisco; plants there belong to a single clone. Five of six historical occurrences extirpated by urbanization; currently threatened by non-native plants, encroachment of native shrubs, and branch dieback due to fungal pathogen. USFWS uses the name A. pungens var. ravenii. See Madroño 19(6):200 (1968) for original description.

Arctostaphylos montana Eastw. ssp. ravenii (P.V. Wells) V.T. Parker, M.C. Vasey & J.E. Keeley

Arctostaphylos hookeri ssp. ravenii

San Mateo (3712253), Montara Mountain (3712254), San Francisco South (3712264)

Known from fewer than ten occurrences. Threatened by development and vehicles. See Four Seasons 2(3):8 (1967) for original description.

Arctostaphylos montaraensis Roof

Rana Creek (3612145), Carmel Valley (3612146), Chualar (3612155), Spreckels (3612156), Seaside (3612157), Monterey (3612158), Salinas (3612166), Marina (3612167)

Known from fewer than 20 occurrences. Threatened by development. See Leaflets of Western Botany 10:88 (1964) for original description.

Arctostaphylos montereyensis Hoov.

San Luis Obispo (3512036), Morro Bay South (3512037)

Known from fewer than 10 occurrences in the Morro Bay area; estimated to cover less than 350 acres as of 1996. Threatened by urbanization, alteration of fire regimes, and non-native plants. See Madroño 5(1):42 (1939) for original description.

Arctostaphylos morroensis Wies. & Schreib.

Calaveritas (3812025), San Andreas (3812026), Valley Springs (3812027), Wallace (3812028), Mokelumne Hill (3812036), Jackson (3812037), Ione (3812038), Irish Hill (3812048), Carbondale (3812141)

Threatened by erosion, mining, development and fungal infection. Protected in part at Ione Manzanita ACEC (BLM) and Apricum Hill ER (DFG), both in AMA Co. See Pittonia 1:34 (1887) for original description, Ecology 45(4):792-808 (1964) for ecological discussion, and Changing Seasons 1(4):4-19 (1982) for species account.

Arctostaphylos myrtifolia Parry

Sonora (3712084), Camino (3812066), Placerville (3812067), Pollock Pines (3812075), Slate Mtn. (3812076), Garden Valley (3812077), Georgetown (3812087)

Threatened by development. See Proceedings of the Biological Society of Washington 31:102 (1918) for original description, Four Seasons 1(4):7-15 (1966) for species account, and Four Seasons 6(4):12-16 (1983) for range extension information.

Arctostaphylos nissenana Merriam

Mathison Peak (3912336), Mendocino (3912337), Noyo Hill (3912346), Fort Bragg (3912347)

Known only from one occurrence on the Mendocino Plains. See Four Seasons 8(3):30 (1989) for original description.

Arctostaphylos nummularia A. Gray ssp. mendocinoensis (P.V. Wells) V.T. Parker, M.C. Vasey & J.E. Keeley

Arctostaphylos mendocinoensis

Davenport (3712212), Big Basin (3712222)

Possibly threatened by road maintenance and vehicles. Potentially threatened by Phytophthora root rot. See Madroño 55(3):238-243 for original description.

Arctostaphylos ohloneana M.C. Vasey & V.T. Parker

Morro Bay South (3512037)

Known only from two occurrences in the mountains north of Los Osos Valley. Threatened by urbanization. See Four Seasons 9(2):45 (1992) for original description.

Arctostaphylos osoensis Wells

Otay Mountain (3211657), Otay Mesa (3211658), Dulzura (3211667), Jamul Mountains (3211668), Descanso (3211675), Julian (3311615), Hot Springs Mtn. (3311635)

Historical occurrences need field surveys. Threatened by development and frequent wildfires. See Madroño 5(1):43 (1939) for original description.

Arctostaphylos otayensis Wies. & Schreib.

San Francisco South (3712264)

Known only from San Bruno Mountain in San Mateo County. Potentially threatened by alteration of fire regimes and recreational activities. Once considered a hybrid between A. glandulosa and A. uva-ursi. See A. uva-ursi in The Jepson Manual (1993). See Leaflets of Western Botany IX (13-14): 217 (1962) for original description.

Arctostaphylos pacifica Roof

changed from 1B.2 to 1B.1 on 2017-02-16

MNT, SBT, SCR

Seaside (3612157), Monterey (3612158), Mt. Harlan (3612164), Salinas (3612166), Marina (3612167), Hollister (3612174), San Juan Bautista (3612175), Prunedale (3612176), Moss Landing (3612177), Watsonville East (3612186), Watsonville West (3612187), Davenport (3712212)

Threatened by development and non-native plants. Possibly threatened by road construction. See Journal of the Elisha Mitchell Scientific Society 56:41 (1940) for original description.

Arctostaphylos pajaroensis Adams

Broadleafed upland forest, Closed-cone coniferous forest, Chaparral, Cismontane woodland, Coastal scrub

Oakland East (3712272), Briones Valley (3712282), Richmond (3712283)

Known from fewer than 10 occurrences in the Contra Costa Hills of the Diablo Range. Threatened by alteration of fire regimes, non-native plants, and road construction, and possibly by development, fungal infection, and hybridization. Plants from 465B are introduced. See Leaflets of Western Botany 1:76 (1933) for original description, and Four Seasons 7(4):28-46 (1987) for ecological assessment.

Arctostaphylos pallida Eastw.

Lompoc (3412064), Pismo Beach (3512026), Port San Luis (3512027), Lopez Mtn. (3512035), San Luis Obispo (3512036), Morro Bay South (3512037)

Known only from Pecho Hills area. Threatened by urbanization. See North American Flora 29:98 (1914) for original description.

Arctostaphylos pechoensis Dudl.

Huasna Peak (3512013), Nipomo (3512014), Oceano (3512015), Caldwell Mesa (3512023), Tar Spring Ridge (3512024), Arroyo Grande NE (3512025), Pismo Beach (3512026), Port San Luis (3512027), La Panza (3512032), Pozo Summit (3512033), Santa Margarita Lake (3512034), San Luis Obispo (3512036), Atascadero (3512046), Cypress Mountain (3512058)

Threatened by development, road construction, road maintenance, vehicles, vegetation clearing, and non-native plants. Plants from the coastal sector of the San Luis Range and Arroyo Grande drainage in SLO Co. were previously treated as A. wellsii. See Erythea 8:101 (1938) for original description.

Arctostaphylos pilosula Jeps. & Wies.

Arctostaphylos pilosula ssp. pilosula, Arctostaphylos wellsii

Closed-cone coniferous forest, Chaparral (maritime), Cismontane woodland, Coastal dunes, Coastal scrub

Soberanes Point (3612148), Spreckels (3612156), Seaside (3612157), Monterey (3612158), Salinas (3612166), Marina (3612167)

Threatened by urbanization, and by military activities at Ft. Ord.

Arctostaphylos pumila Nutt.

Sacate (3412043), Point Conception (3412044), Solvang (3412052), Santa Rosa Hills (3412053), Lompoc Hills (3412054), Tranquillon Mtn. (3412055), Los Alamos (3412063), Lompoc (3412064), Surf (3412065), Sisquoc (3412073), Orcutt (3412074), Casmalia (3412075), Guadalupe (3412085), Point Sal (3412086)

Threatened by urbanization, habitat conversion, and oil extraction. See Madroño 19:195 (1968) for original description.

Arctostaphylos purissima Wells

Valley Center (3311721), Pala (3311731), Morro Hill (3311733), Pechanga (3311741), Temecula (3311742), Fallbrook (3311743), Margarita Peak (3311744), Murrieta (3311752), Wildomar (3311753), Sitton Peak (3311754)

Previously called A. peninsularis ssp. peninsularis or considered to be a hybrid between A. glandulosa and A. glauca. Threatened by development and agricultural conversion. Not in The Jepson Manual. See Madroño 41(1):2 (1994) for original description.

Arctostaphylos rainbowensis J. Keeley & Massihi

Santa Barbara (3411946), Goleta (3411947), Lake Cachuma (3411958), Gaviota (3412042), Sacate (3412043), Point Conception (3412044), Santa Ynez (3412051), Solvang (3412052), Santa Rosa Hills (3412053), Lompoc Hills (3412054), Los Olivos (3412061), Lompoc (3412064), Sisquoc (3412073)

Potentially threatened by development. See Four Seasons 2(2):13 (1967) for original description.

Arctostaphylos refugioensis Gankin

SCL, SCR, SMT

Watsonville East (3612186), Big Basin (3712222), Mindego Hill (3712232), La Honda (3712233), Palo Alto (3712242), Woodside (3712243), Montara Mountain (3712254)

Plants north of Big Basin in SCR Co. (408B) look intermediate; identification uncertain. Threatened by urbanization. Not regenerating well. See Leaflets of Western Botany 1:77 (1933) for original description.

Arctostaphylos regismontana Eastw.

Point Conception (3412044), Lompoc Hills (3412054), Tranquillon Mtn. (3412055), Point Arguello (3412056), Los Alamos (3412063), Lompoc (3412064), Surf (3412065), Sisquoc (3412073), Orcutt (3412074), Casmalia (3412075), Santa Maria (3412084), Guadalupe (3412085), Point Sal (3412086), Nipomo (3512014), Oceano (3512015), Arroyo Grande NE (3512025)

Severely reduced on Nipomo Mesa; more widespread on Burton Mesa. Threatened by agriculture, road construction, road maintenance, and oil extraction. Possibly threatened by development. See Erythea 8:100 (1938) for original description.

Arctostaphylos rudis Jeps. & Wies.

Laurel (3712118), Felton (3712211), Davenport (3712212), Castle Rock Ridge (3712221), Big Basin (3712222)

Threatened by sand mining and urbanization. See Erythea 8:101 (1938) for original description.

Arctostaphylos silvicola Jeps. & Wies.

Rutherford (3812244), Kenwood (3812245), Santa Rosa (3812246), Sebastopol (3812247), Calistoga (3812255), Geyserville (3812268), Cazadero (3812351), Warm Springs Dam (3812361)

Known from approximately ten occurrences. Seriously threatened by development, road construction, vehicles, and viticulture. See Four Seasons 4(2):16 (1972) for original description and 9(2):60-63 (1992) for revised nomenclature.

Arctostaphylos stanfordiana Parry ssp. decumbens Wells

Arctostaphylos stanfordiana var. repens

Whispering Pines (3812276), Clearlake Highlands (3812286), Kelseyville (3812287), Highland Springs (3812288), Yorkville (3812382), Purdys Gardens (3912311), Elledge Peak (3912312), Cow Mountain (3912321), Orrs Springs (3912323), Leggett (3912376), Noble Butte (3912386)

Threatened by urbanization and vehicles. See Four Seasons 7(3):18 (1985) for original description.

Arctostaphylos stanfordiana Parry ssp. raichei Knight

Morro Bay South (3512037)

Known only from Hollister Peak. Potentially threatened by urbanization. See Four Seasons 9(2):60 (1992) for original description.

Arctostaphylos tomentosa (Pursh) Lindl. ssp. daciticola Wells

San Rafael (3712285), Bolinas (3712286), Double Point (3712287), San Geronimo (3812216), Inverness (3812217), Drakes Bay (3812218), Tomales (3812228)

Known from approximately twenty occurrences. Threatened by fire suppression. See Trees and Shrubs 1:203 (1905) for original description.

Arctostaphylos virgata Eastw.

LAX, SBD, SCR, SFO, SLO

San Bernardino South (3411713), Hollywood (3411813), Oceano (3512015), Pismo Beach (3512026), Morro Bay South (3512037), Santa Cruz (3612281), Felton (3712211), San Francisco North (3712274)

Known from only two natural occurrences in Black Lake Cyn. And at Oso Flaco Lk. Threatened by vehicles, development, erosion, hydrological alterations, and non-native plants. Individuals re-introduced in Black Lake Cyn. in 1995. Introduced population in Los Osos well established as of 2003. Experimental introduction also underway in Nipomo as of 2004. Collection from Mexico needs confirmation. See Proceedings of the California Academy of Natural Sciences 3:61 (1863) for original description.

Arenaria paludicola Rob.

PDCAR040L0

La Panza Ranch (3512042), Camatta Ranch (3512043), San Miguel (3512076), Bryson (3512171), Cosio Knob (3612112)

Threatened by development. See Bulletin of the California Academy of Sciences 1:275 (1885) for original description, Great Basin Naturalist Memoirs 2:169-190 (1978) for taxonomic treatment, and Phytologia 66(2):83-88 (1989) for revised nomenclature and taxonomic treatment.

Aristocapsa insignis (Curran) Rev. & Hardham

Centrostegia insignis, Chorizanthe insignis

PDPGN0U010

openings, disturbed areas, sometimes roadsides

Gualala (3812375), Cold Spring (3912315), Mallo Pass Creek (3912316), Bailey Ridge (3912324), Navarro (3912325), Greenough Ridge (3912334), Burbeck (3912344), Northspur (3912345), Noyo Hill (3912346), Sherwood Peak (3912355), Dutchmans Knoll (3912356), Cahto Peak (3912365), Lincoln Ridge (3912366), Westport (3912367), Hales Grove (3912377), Miranda (4012327), Myers Flat (4012337), Bridgeville (4012347), Redcrest (4012348)

Rediscovered in 1987 by R. Sutherland, R. Bittman, and K. Berg near Miranda. Threatened by grazing, competition, logging, and road maintenance. Potentially threatened by habitat alteration and non-native plants. See Madroño 14(1):37-40 (1957) for original description, Fremontia 16(1):13-14 (1988) for discussion of rediscovery and 20(4):21-22 (1992) for management update, and Madroño 46(4):215 (1999) for occurrence information.

Astragalus agnicidus Barneby

Rattlesnake Canyon (3411636), Big Bear City (3411637), Fawnskin (3411638), Cougar Buttes (3411647), Lucerne Valley (3411648)

Threatened by carbonate mining, grazing, energy development, road construction, and vehicles. See Bulletin of the California Academy of Sciences 1:156 (1885) for original description, and Fremontia 16(1):20-21 (1988) for discussion of mining threats.

Astragalus albens Greene