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    Vascular Plants of California
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Pterocarya stenoptera

Higher Taxonomy
Family: JuglandaceaeView DescriptionDichotomous Key

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: PterocaryaView Description 

Common Name: WINGNUT
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.
Species In Genus: 6 species: temperate Asia. Etymology: (Greek: winged nut)

Pterocarya stenoptera C. DC.
Habit: 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.
Ecology: Disturbed stream channels; Elevation: 15 m. Bioregional Distribution: GV. Flowering Time: Spring
eFlora Treatment Author: Alan T. Whittemore
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Citation for this treatment: Alan T. Whittemore 2012, Pterocarya stenoptera, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 17, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on October 17, 2018.

Geographic subdivisions for Pterocarya stenoptera:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.