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Alan T. Whittemore

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.
9 genera, > 60 species: northern temperate, subtropical mountains; some ornamental, cultivated for wood, nuts (Carya hickory, pecan; Juglans walnut). [Stone 1997 FNANM 3:416–428] In Carya, Juglans, husk included in fruit diam, even though derived from involucre, calyx, and therefore not technically part of fruit. —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Elias 1972 J Arnold Arbor 53: 26–51]

Key to Juglandaceae

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.
21 species: North America, temperate Asia, South America. (Latin: Jove's nut) 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.

Key to Juglans

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.
Hillsides and canyons; 30–900 m. Outer South Coast Ranges (Santa Lucia Range where cultivated), Southwestern California (except Channel Islands, San Bernardino Mountains). Mar–May [Online Interchange] {CNPS list}
Unabridged synonyms: [Juglans californica S. Watson var. californica]

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Next taxon: Juglans hindsii


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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 24 2015
Citation for this treatment: [Author of taxon treatment] 2013. Juglans, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 24 2015

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Geographic subdivisions indicated for the distribution of Juglans californica 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.
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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CCH collections by month

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