Species Details

Juglans californica

Southern California black walnut

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No Photo Available
CA Rare Plant Rank: 4.2
Fed List: None
State List: None
Global Rank: G4
State Rank:
S4
Other Status: IUCN_NT; SB_CalBG/RSABG; SB_USDA
CRPR Changes:
Add Date: 1994-01-01
Date Edited: 2021-09-27
Lifeform: perennial deciduous tree
Blooming Period: Mar-Aug
Elevation:
50 - 900 meters
165 - 2955 feet
General Habitat:
  • Chaparral
  • Cismontane woodland
  • Coastal scrub
  • Riparian woodland
General Micro Habitat: alluvial
Micro Habitat:
Notes:
Walnut forest is a much fragmented, rare, and declining vegetation community. Threatened by urbanization, grazing, non-native plants, and possibly by lack of natural reproduction. Possibly threatened by hybridization with horticultural varieties of walnut. A synonym of J. californica var. californica in The Jepson Manual. See Proceedings of the American Academy of Arts and Sciences 10:349 (1875) for original description, and Southern California Botanists Special Publication No. 3, pp. 42-54 (1990) for additional information.
Threats:
Taxonomy:
Other:
References:
Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Fresno (FRE), Kern (KRN), Los Angeles (LAX), Orange (ORA), Riverside (RIV), San Benito (SBT), San Bernardino (SBD), San Diego (SDG), Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Acton (3411842), Alamo Mountain (3411868), Alberhill (3311764), Alpine (3211677), Anaheim (3311778), Azusa (3411728), Bachelor Mtn. (3311751), Bald Mountain (3411978), Baldwin Park (3411718), Beaumont (3311688), Beverly Hills (3411814), Black Mtn. (3411867), Black Star Canyon (3311776), Blackburn Canyon (3311667), Bonsall (3311732), Borrego Palm Canyon (3311634), Briones Valley (3712282), Burbank (3411823), Cabazon (3311687), Cajon (3411734), Calabasas (3411826), Camarillo (3411921), Canada Gobernadora (3311755), Canoga Park (3411825), Carpinteria (3411945), Casmalia (3412075), Cobblestone Mtn. (3411857), Condor Peak (3411832), Corona North (3311785), Corona South (3311775), Crystal Lake (3411737), Cucamonga Peak (3411725), Devils Heart Peak (3411858), Devore (3411724), Dulzura (3211667), Eagle Rest Peak (3411982), Earthquake Valley (3311614), El Cajon (3211678), El Cajon Mtn. (3211687), El Casco (3311781), El Monte (3411811), El Toro (3311766), Fallbrook (3311743), Fillmore (3411848), Fontana (3411714), Forest Falls (3411618), Glendora (3411727), Goleta (3411947), Green Valley (3411854), Guasti (3411715), Hollywood (3411813), Jamul Mountains (3211668), Julian (3311615), La Habra (3311788), Laguna Beach (3311757), Lake Elsinore (3311763), Lake Mathews (3311774), Las Trampas Ridge (3712271), Lion Canyon (3411952), Lompoc Hills (3412054), Los Alamos (3412063), Los Angeles (3411812), Malibu Beach (3411816), Matilija (3411943), Mint Canyon (3411844), Moorpark (3411838), Mount San Antonio (3411736), Mt. Baldy (3411726), Mt. Wilson (3411821), Murrieta (3311752), Newbury Park (3411828), Newhall (3411845), North Chalone Peak (3612142), Oat Mountain (3411835), Ojai (3411942), Old Man Mountain (3411954), Ontario (3411716), Orange (3311777), Orcutt (3412074), Pala (3311731), Pasadena (3411822), Piru (3411847), Point Conception (3412044), Point Dume (3411817), Point Mugu (3411911), Prado Dam (3311786), Rancho Nuevo Creek (3411964), Rancho Santa Fe (3311712), Redlands (3411712), Riverside East (3311783), Riverside West (3311784), Rodriquez Mtn. (3311628), Romoland (3311762), San Bernardino North (3411723), San Bernardino South (3411713), San Dimas (3411717), San Fernando (3411834), San Pasqual (3311618), Santa Barbara (3411946), Santa Paula (3411931), Santa Paula Peak (3411941), Santa Susana (3411836), Santa Ynez (3412051), Santiago Peak (3311765), Saticoy (3411932), Silverwood Lake (3411733), Simi (3411837), Sitton Peak (3311754), Solvang (3412052), Sunland (3411833), Sunnymead (3311782), Telegraph Peak (3411735), Temecula (3311742), Thousand Oaks (3411827), Topanga (3411815), Torrance (3311873), Tranquillon Mtn. (3412055), Triunfo Pass (3411818), Tubb Canyon (3311624), Val Verde (3411846), Valyermo (3411747), Van Nuys (3411824), Ventura (3411933), Viejas Mountain (3211676), Warm Springs Mountain (3411855), Waterman Mtn. (3411738), Wheeler Springs (3411953), Whitaker Peak (3411856), White Ledge Peak (3411944), Whittier (3311881), Wildomar (3311753), Winchester (3311761), Yorba Linda (3311787), Yucaipa (3411711)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Map

Presumed Extant
Counties   Quads