Flora of the Southeastern United States

*Reynoutria japonica Houttuyn var. japonica. Common name: Japanese Knotweed, Japanese Bamboo, Japanese Buckwheat. Phenology: May-Oct; Aug-Oct. Habitat: Roadsides, disturbed areas, river banks and sandbars, often forming dense thickets. Distribution: Native of e. Asia.

Origin/Endemic status: E. and se. Asia

Taxonomy Comments: Three varieties are endemic in Japan and Korea; they are not known to be introduced in our region (Freeman & Hinds 2005; Desjardins et al. 2023).

Synonymy ⓘ: = Can, Desjardins et al (2023); = Fallopia japonica (Houtt.) Ronse Decr. var. japonica — Ar, FNA5, Mo3, NE; < Fallopia japonica (Houtt.) Ronse Decr. — Mi, Pa, Tn, Ronse De Craene & Akeroyd (1988); < Pleuropterus zuccarinii Small — S; < Polygonum cuspidatum Siebold & Zucc. — C, F, GrPl, RAB, Tat, W, WV, Horton (1972), Mitchell & Dean (1978); < Reynoutria japonica Houtt. — Fl4, Il, K4, NY, Va, Lin et al (2013). Basionym: Reynoutria japonica Houtt. 1777

Links to other floras: = Fallopia japonica var. japonica - FNA5

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: UPL (name change)
• Eastern Mountains and Piedmont: FACU (name change)
• Great Plains: FACU (name change)
• Midwest: FACU (name change)
• Northcentral & Northeast: FACU (name change)