Juglans californica
Common Name: Southern California black walnut
Family: Juglandaceae
Synonyms: Juglans californica var. californica
Element Code: PDJUG02020
Full Name: Juglans californica Wats.

2003 Michael Charters
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences:
  • Element Occurrence Ranks:
    A B C D X U
  • Population Status:
    >20 yrs
    <=20 yrs
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
Notes Glossary
  • 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.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1994-01-01
  • Last Update: 2015-07-23
Location Glossary
  • Elevation: 50 - 900 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Los Angeles (LAX),  Orange (ORA),  Riverside (RIV),  Santa Barbara (SBA),  San Bernardino (SBD),  San Diego (SDG),  Ventura (VEN)
  • Quads:   name (DWR code) USGS code
    Lake Elsinore (069A) 3311763,  Sitton Peak (069C) 3311754,  El Casco (085A) 3311781,  Prado Dam (087B) 3311786,  Yorba Linda (088A) 3311787,  La Habra (088B) 3311788,  Anaheim (088C) 3311778,  Whittier (089A) 3311881,  Yucaipa (106D) 3411711,  San Bernardino North (107A) 3411723,  Devore (107B) 3411724,  Cucamonga Peak (108A) 3411725,  Ontario (108C) 3411716,  Glendora (109A) 3411727,  Baldwin Park (109C) 3411718,  Mt. Wilson (110A) 3411821,  El Monte (110D) 3411811,  Burbank (111A) 3411823,  Van Nuys (111B) 3411824,  Hollywood (111D) 3411813,  Topanga (112D) 3411815,  Cajon (133C) 3411734,  Acton (136B) 3411846,  Val Verde (138B) 3411846,  Condor Peak (136C) 3411832,  San Fernando (137C) 3411834,  Newhall (138A) 3411845,  Acton (136B) 3411846,  Val Verde (138B) 3411846,  Santa Susana (138C) 3411836,  Oat Mountain (138D) 3411835,  Ojai (140B) 3411942,  Matilija (141A) 3411943,  White Ledge Peak (141B) 3411944
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable. This data should NOT be substituted for pre-project review or for on-site surveys.
Includes unprocessed quads for CRPR 3 and 4 plants; unprocessed location data has not been quality controlled and may contain errors.
Presumed Extant Presumed Extirpated or Unknown 1704
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website http://www.rareplants.cnps.org [accessed ].

3311763=Lake Elsinore (069A) 3311763;3311754=Sitton Peak (069C) 3311754;3311781=El Casco (085A) 3311781;3311786=Prado Dam (087B) 3311786;3311787=Yorba Linda (088A) 3311787;3311788=La Habra (088B) 3311788;3311778=Anaheim (088C) 3311778;3311881=Whittier (089A) 3311881;3411711=Yucaipa (106D) 3411711;3411723=San Bernardino North (107A) 3411723;3411724=Devore (107B) 3411724;3411725=Cucamonga Peak (108A) 3411725;3411716=Ontario (108C) 3411716;3411727=Glendora (109A) 3411727;3411718=Baldwin Park (109C) 3411718;3411821=Mt. Wilson (110A) 3411821;3411811=El Monte (110D) 3411811;3411823=Burbank (111A) 3411823;3411824=Van Nuys (111B) 3411824;3411813=Hollywood (111D) 3411813;3411815=Topanga (112D) 3411815;3411734=Cajon (133C) 3411734;3411846=Acton (136B) 3411846;3411846=Val Verde (138B) 3411846;3411832=Condor Peak (136C) 3411832;3411834=San Fernando (137C) 3411834;3411845=Newhall (138A) 3411845;3411846=Acton (136B) 3411846;3411846=Val Verde (138B) 3411846;3411836=Santa Susana (138C) 3411836;3411835=Oat Mountain (138D) 3411835;3411942=Ojai (140B) 3411942;3411943=Matilija (141A) 3411943;3411944=White Ledge Peak (141B) 3411944