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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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JUGLANDACEAE

WALNUT FAMILY

Dieter H. Wilken

Shrub, tree, generally monoecious
Leaves generally odd-1-pinnate, alternate, deciduous; stipules 0
Inflorescence: catkin, generally appearing before leaves, generally clustered; flowers generally solitary in bract axils
Staminate inflorescence generally pendent, generally elongate, generally many-flowered, on last year's twigs
Pistillate inflorescence generally erect; flowers 1–3, at tip of new twigs
Staminate flower: sepals 3–6; petals 0; stamens 3–many; pistil 0 or vestigial
Pistillate flower: sepals 3–6; petals 0; stamens 0; pistil 1, ovary inferior, chamber 1 above, generally 2 below, styles generally 2, plumose
Fruit: nut enclosed in a ± fleshy husk, drupe-like
Genera in family: 7 genera, ± 60 species: n temp, subtropical mtns; some ornamental, cultivated for wood, nuts (Carya hickory, pecan; Juglans )
Reference: [Elias 1972 J Arnold Arb 53:26–51]

JUGLANS

WALNUT

Shrub, tree, generally monoecious
Stem generally erect; bark smooth to furrowed in age, gray to brown; twig centers chambered
Staminate flower: calyx lobes generally 4, ± fused to bract
Pistillate flower: calyx lobes 4, generally ± fused to bract and bractlets, with them forming husk in fruit
Fruit in clusters, generally spheric; husk leathery, strong-smelling, indehiscent yet ± deciduous
Species in genus: 21 species: temp North America., n temp Eur, Asia, South America
Etymology: (Latin: walnut)
Reference: [Howell 1973 Madroño 22:144]
Wood used for interior finishing, furniture; source of nuts.

Introduced

J. regia L.

PERSIAN or ENGLISH WALNUT

Tree
Stem: trunk 1, generally < 30 m; bark gray; twigs green to gray
Leaf: leaflets 7–9, 6–12 cm, elliptic to oblong, generally entire
Fruit (including husk) 4–5 cm diam, woody nut shell wrinkled
Ecology: Persisting near abandoned habitations
Elevation: < 200 m.
Bioregional distribution: Great Central Valley, Central Western California, Southwestern California
Distribution outside California: native to se Europe, s temperate Asia
Widely cultivated for nuts, wood.

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bioregional map for JUGLANS%20regia being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Juglans regia
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