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*Reynoutria japonica Houttuyn var. japonica . Japanese Knotweed, Japanese Bamboo, Japanese Buckwheat. Phen: May-Oct; Aug-Oct. Hab: Roadsides, disturbed areas, river banks and sandbars, often forming dense thickets. Dist: 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: = Desjardins et al (2023); = Fallopia japonica (Houtt.) Ronse Decr. var. japonica – Ar, FNA5, 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, K1, RAB, Tat, W, WV, Horton (1972), Mitchell & Dean (1978); < Reynoutria japonica Houtt. – Fl4, Il, K3, K4, NY, Va, Lin et al (2013)

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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)

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image of plant© Keith Bradley | Original Image ⭷
image of plant© Keith Bradley | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Radford, Ahles and Bell | Original Image ⭷

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