Flora of North America species comparison

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Fallopia japonica

Japanese knotweed, Japanese wing-knotweed

Fallopia japonica
Distribution
from FNA
AK; AR; CA; CO; CT; DC; DE; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NY; OH; OK; OR; PA; RI; SC; SD; TN; UT; VA; VT; WA; WI; WV; BC; MB; NB; NF; NS; ON; PE; QC [Asia, introduced in Europe]
[WildflowerSearch map]
Discussion

Varieties 4 (1 in the flora).

Fallopia japonica is planted widely as a garden ornamental; it has a proclivity to escape and spread aggressively. Once established, plants can be difficult to eradicate because of their extensive, woody rhizomes. The species has been declared noxious in Alabama, California, Oregon, Vermont, and Washington.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 543.
Parent taxa Polygonaceae > subfam. Polygonoideae > Fallopia
Sibling taxa
F. baldschuanica, F. cilinodis, F. convolvulus, F. dumetorum, F. sachalinensis, F. scandens, F. ×bohemica
Subordinate taxa
F. japonica var. japonica
Synonyms Reynoutria japonica
Name authority (Houttuyn) Ronse Decraene: Bot. J. Linn. Soc. 98: 369. (1988)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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