UW Burke Herbarium species comparison

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Fallopia japonica

Polygonaceae

Japanese knotweed

Fallopia japonica

Polygonaceae
Flowering time June-September
Habitat Riparian zones, roadsides, ditches, wastelots, and other disturbed open areas.
Distribution
Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from eastern Asia Native
Conservation status Not of concern Not of concern
Sibling taxa
F. baldschuanica, F. ×bohemica, F. convolvulus, F. sachalinensis
Subordinate taxa
F. japonica var. japonica
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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