Reynoutria japonica

Characteristics

Polygonaceae
Reynoutria
Reynoutria japonica Houtt. var. japonica
Japanese knotweed
Edges of streams, exposed gravel and sand bars in streams, floodplains, roadsides, and waste places. Often forming dense large monospecific stands. Widespread and often mixed with the hybrid Reynoutria ×bohemica
Herbaceous
Perennial
Vascular
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Often confused with Reynoutria ×bohemica. Many records of R. japonica are actually R. ×bohemica.
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Not Native Naturalized FACU (NWPL EMP) FACU (NWPL NCNE) SNA (State Rank)
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** Not applicable or data not available.

Classification

Eudicots
Caryophyllales
Polygonaceae
Reynoutria
Reynoutria japonica Houtt. var. japonica - Japanese knotweed

Citation

Reynoutria japonica Houtt. var. japonica
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** Not applicable or data not available.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display its name.

Source

Synonyms

Plant Photos

Photo by: Andrew Nelson - Rice Creek Field Sta., SUNY Oswego Photo taken: Oswego County, NY: 23 Jun 1995 - 1
Photo by: Andrew Nelson - Rice Creek Field Sta., SUNY Oswego Photo taken: Oswego County, NY: 23 Jun 1995 - Andrew Nelson View Full Size
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 -
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 View Full Size
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 -
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 View Full Size
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 -
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 View Full Size
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 -
Photo By: Stephen M. Young. Photo taken: Suffolk, NY: 4 October 2007 View Full Size