Juglans
walnut
4 species
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Juglans ailantifoliaJapanese walnut
Distribution: Occurring on both sides of the Cascades crest in Washington; southwestern British Columbia to the Columbia River Gorge in Washington, aslo in west-central Idaho.
Habitat: Riparian corridors, stream and river banks, thickets, and forest edge, at low elevations, often where distrubed.
Origin: Introduced from Japan
Flowers: May-June
Juglans hindsiinorthern California walnut
Origin: Introduced
Juglans nigrablack walnut
Distribution: In scattered locations across Washington, mostly east of the Cascades; central U.S. east to the Atlantic Coast.
Habitat: Disturbed areas and riparian zones, typically in the vicinity of urbanized areas where escaped from cultivation.
Origin: Introduced
Flowers: April-May
Juglans regiaEnglish walnut
Origin: Introduced from Europe