Taxon  Report   11035 
Polygonum majus  (Meisn.) Piper
Large douglas' knotweed
Polygonum majus, a dicot, is an annual herb that is native to California.
 

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Polygonum majus
© 2008 Keir Morse
Polygonum majus
© 2008 Keir Morse
Wetlands:Usually occurs in non wetlands, but occasionally found in wetlands [U.S. Fish & Wildlife Service.]
AFFINITY to serpentine soil:   1.5 (weak indicator)   [Safford et al 2005]
Family: POLYGONACEAE  
Genus: Polygonum
Add an Observation of Polygonum majus
Name Status:
Accepted by TJM2
PLANTS: accepted name: Polygonum douglasii ssp. majus
Other Names:
(according to)

TJM2: Polygonum douglasii ssp. majus
 Information about  Polygonum majus  from other sources:
USDA PLANTS Profile (PODOM2)

Nursery availability and horticultural info on CNPLX

Photos on CalPhotos / Flickr / Google Images

website references on Google

Jepson eFlora (TJM2)

Records from the Consortium of California Herbaria

Search efloras.org (Flora of North America)

Search the Lady Bird Johnson Wildflower Center

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]. 2014. Berkeley, California: The Calflora Database [a non-profit organization].
Available: http://www.calflora.org/   (Accessed: Jul 29, 2014).

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

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