Juglans californica


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Juglans californica
Species Authority: S.Watson
Common Name(s):
English Northern California Black Walnut, Southern California Black Walnut

Assessment Information [top]

Red List Category & Criteria: Vulnerable A1c ver 2.3
Year Published: 1998
Date Assessed: 1998-01-01
Needs updating
Assessor(s): World Conservation Monitoring Centre

Geographic Range [top]

Range Description: The species may be divided into two varieties, vars. californica and hindsii, both endemic to California. Walnut forest is a much fragmented and declining habitat. There are just two or three stands remaining of var. hindsii, although it is widely naturalised in parts of California and was formerly cultivated as a rootstock for J. regia, with which it readily hybridizes.
United States (California)
Range Map: Click here to open the map viewer and explore range.

Habitat and Ecology [top]

Systems: Terrestrial

Threats [top]

Major Threat(s): Threatened in several counties by urbanisation, grazing and possibly by the lack of natural reproduction.

Citation: World Conservation Monitoring Centre 1998. Juglans californica. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 03 September 2015.
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