Copy permalink to share

*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

Show in key(s)

Show parent genus | Show parent in key(s)

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)

Your browser does not support SVGs

Hover over a shape, letter, icon, or arrow on the map for definition or see the legend.

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 ⭷

Feedback

See something missing or incorrect about Reynoutria japonica var. japonica? Let us know here:

  1. Please include your name and if possible, email in case when need to clarify what you wrote.
  2. If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
  3. Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
  4. Please do not send us feedback about unkeyed species as this work is ongoing.
  5. Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.

Horticultural Information

No horticultural data found for this taxon.