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Juglans californica
SOUTHERN CALIFORNIA BLACK WALNUT

Higher Taxonomy
Family: JuglandaceaeView DescriptionDichotomous Key

Common Name: WALNUT FAMILY
Habit: Shrub, tree; monoecious. Leaf: odd-(even-)1-pinnate, alternate, deciduous; stipules 0. Inflorescence: catkin, generally appearing before leaves, 1 or clustered; flowers generally 1 in bract axils. Staminate Inflorescence: pendent, elongate, many-flowered, on last year's twigs. Pistillate Inflorescence: erect; flowers 1--many, at tip of new twigs. Staminate Flower: calyx [0 or] lobes generally 4 [2, 6]; petals 0; stamens 3--40[50]; pistil 0 or vestigial. Pistillate Flower: calyx [0] or lobes 4; petals 0; stamens 0; ovary 1, inferior, chamber 1 above, generally 2 below, styles 2, plumose. Fruit: nut enclosed in husk or winged nutlets.
Genera In Family: 9 genera, > 60 species: northern temperate, subtropical mountains; some ornamental, cultivated for wood, nuts (Carya hickory, pecan; Juglans walnut). Note: In Carya, Juglans, husk included in fruit diam, even though derived from involucre, calyx, and therefore not technically part of fruit.
eFlora Treatment Author: Alan T. Whittemore
Scientific Editor: Thomas J. Rosatti.
Genus: JuglansView DescriptionDichotomous Key

Common Name: WALNUT
Stem: bark smooth to furrowed in age, gray to gray-brown; twig centers chambered; buds scaly. Pistillate Inflorescence: flowers 1--few; in fruit erect. Pistillate Flower: styles elongate. Fruit: 1--3 unwinged nuts per inflorescence; leathery husk enclosing, not separating from each nut, not splitting.
Species In Genus: 21 species: North America, temperate Asia, South America. Etymology: (Latin: Jove's nut) Note: Wood used for interior finishing, furniture; source of nuts, dye. Juglans nigra L., occasionally planted, resembles Juglans hindsii but has leaflets uniformly pubescent abaxially, nuts deeply grooved, coarsely warty.

Juglans californica S. Watson
NATIVE
Stem: trunk 6--9 m. Leaf: petiole 2--5 cm; leaflets (9)11--15(17), 4--9.5 cm, generally narrow-elliptic to -lance-elliptic (less often lanceolate), +- serrate, rounded to acute, abaxial vein axils glabrous. Fruit: 2--3.5 cm diam, nut shell thick, shallowly grooved.
Ecology: Hillsides and canyons; Elevation: 30--900 m. Bioregional Distribution: SCoRO (Santa Lucia Range where cult), SW (exc ChI, SnBr). Flowering Time: Mar--May
eFlora Treatment Author: Alan T. Whittemore
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Listed on CNPS Rare Plant Inventory

Previous taxon: Juglans
Next taxon: Juglans hindsii

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Citation for this treatment: Alan T. Whittemore 2016. Juglans californica, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29566, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on April 29, 2016.


Juglans californica
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© 2006 George W. Hartwell
Juglans californica
click for enlargement
© 2006 George W. Hartwell
Juglans californica
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© 2006 George W. Hartwell
Juglans californica var. hindsi
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© 2007 George W. Hartwell
Juglans californica
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© 2003 Michael Charters
Juglans californica var. hindsi
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© 2007 George W. Hartwell

More photos of Juglans californica in CalPhotos


Geographic subdivisions for Juglans californica:
SCoRO (Santa Lucia Range where cult), SW (exc ChI, SnBr).
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.