Juglans
walnut
4 species
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Juglans ailantifolia – Japanese 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
Growth Duration: Perennial
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
Growth Duration: Perennial
Juglans hindsii – northern California walnut
Distribution: Occurring east of the Cascades crest in Washington; south-central Washington to western Oregon; native to southwestern Oregon and California.
Habitat: Fields, roadsides, homesteads, and other disturbed, open areas.
Origin: Introduced from southwestern Oregon and California
Flowers: April-June
Growth Duration: Perennial
Distribution: Occurring east of the Cascades crest in Washington; south-central Washington to western Oregon; native to southwestern Oregon and California.
Habitat: Fields, roadsides, homesteads, and other disturbed, open areas.
Origin: Introduced from southwestern Oregon and California
Flowers: April-June
Growth Duration: Perennial
Juglans nigra – black walnut
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to Oregon, east to Idaho; native to central and eastern North America.
Habitat: Disturbed areas and riparian zones, typically in the vicinity of urbanized areas where escaped from cultivation.
Origin: Introduced from central and eastern North America
Flowers: April-May
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to Oregon, east to Idaho; native to central and eastern North America.
Habitat: Disturbed areas and riparian zones, typically in the vicinity of urbanized areas where escaped from cultivation.
Origin: Introduced from central and eastern North America
Flowers: April-May
Growth Duration: Perennial
Juglans regia – English walnut
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho; also in the northeastern U.S.
Habitat: Fields, roadsides, wastelots, and other disturbed areas, where escaping from cultivation
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho; also in the northeastern U.S.
Habitat: Fields, roadsides, wastelots, and other disturbed areas, where escaping from cultivation
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Perennial
