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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; pistil 0 or vestigial. Pistillate flower: calyx  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 shallowly furrowed in age, gray; twig centers chambered; buds naked [scaly]. Pistillate inflorescence: flowers 15–50; in fruit pendent. Pistillate flower: styles short. Fruit: 15–50 2-winged nutlets, not enclosed in husk.
6 species: temperate Asia. (Greek: winged nut)
Tree 10–30 m. Leaf: leaflets 6–21, 7–11 cm, 2.5–4 cm wide, lateral narrowly elliptic to oblong or oblanceolate, finely, evenly serrate, tips obtuse or ± mucronate, terminal sometimes 0 or small; main axis winged (at least below leaflet attachment distally). Fruit: body 6–9 mm, wings 13–24 mm, 5–6 mm diam.
Disturbed stream channels; 15 m. Great Central Valley. Spring [Online Interchange]
Previous taxon: Pterocarya
Next taxon: Koeberliniaceae
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 13 2015
Citation for this treatment: [Author of taxon treatment] 2013. Pterocarya, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=40263, accessed on Oct 13 2015
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|Geographic subdivisions indicated for the distribution of Pterocarya stenoptera|| 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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(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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