Taxon  Report   6746 
Polygonum cuspidatum  Sieb. & Zucc.  (not an active name; please see Fallopia japonica)
Japanese knotweed

Polygonum cuspidatum
© 2006 Dr. Amadej Trnkoczy
Polygonum cuspidatum, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate - ALERT   (plant profile / CalWeedMapper).

 Interactive Distribution Map 

 Observation Hotline 
 (observation details + photos)

point, line, or polygon

one or more occurrences within a 7.5-minute quadrangle

 Plant Characteristics
 and Associations
Polygonum cuspidatum
© 2005 Louis-M. Landry
Genus: Polygonum
escaped cultivar
Wetlands:Usually occurs in non wetlands, but occasionally found in wetlands [U.S. Fish & Wildlife Service.]
Distribution by County 

Add an Observation of  Polygonum cuspidatum

Name Status:
Accepted by PLANTS + JM93
TJM2 accepted name: Fallopia japonica
Alternate Names:
(according to)

PLANTS: Fallopia japonica
PLANTS: Pleuropterus cuspidatus
PLANTS: Pleuropterus zuccarinii
PLANTS: Polygonum cuspidatum var. compactum
PLANTS: Polygonum zuccarinii
PLANTS: Reynoutria japonica
 NOTE: Polygonum cuspidatum is not an active name in the Calflora species table.
 Information about  Polygonum cuspidatum  from other sources:

Photos on CalPhotos / Google Images

website references on Google

Records from the Consortium of California Herbaria

Original Publication citation. on the
International Plants Names Index

Search (Flora of North America)

Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria.
[web application]. 2015. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Oct 05, 2015).

The information on this page comes from diverse sources. None of the links are sponsored.

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