Taxon  Report   6748 
Polygonum douglasii  E. Greene
Douglas' knotweed
Polygonum douglasii
© 2003 Michael Charters
CalPhotos: click on a
photo to see it bigger
Polygonum douglasii
© 2012 Jean Pawek
Polygonum douglasii
© 2009 Barry Breckling
Polygonum douglasii, a dicot, is an annual herb that is native to California and is also found elsewhere in North America and beyond.

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

Plant Characteristics
and Associations



Bloom Period
Polygonum douglasii
© 2009 Barry Breckling
Family: POLYGONACEAE  
Genus: Polygonum
Communities:
Yellow Pine Forest, Red Fir Forest, Lodgepole Forest, Subalpine Forest, Sagebrush Scrub
Habitat: meadows [Walker]
Wetlands:Usually occurs in non wetlands, but occasionally found in wetlands [U.S. Fish & Wildlife Service.]
Distribution by County 

Add an Observation of  Polygonum douglasii

Name Status:
Accepted by TJM2 + PLANTS + JM93
Alternate Names:
(according to)

TJM2: Polygonum buxiforme
TJM2: Polygonum douglasii ssp. douglasii
More information about  Polygonum douglasii
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Photos on CalPhotos / Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)

USDA PLANTS Profile (PODO4)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

Search the Lady Bird Johnson Wildflower Center

website references from Google


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]. 2016. Berkeley, California: The Calflora Database [a non-profit organization].
Available: http://www.calflora.org/   (Accessed: Aug 29, 2016).

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