Taxon  Report   6747 
Polygonum davisiae  A. Gray   (not an active name; please see Aconogonon davisiae)
Davis Knotweed,  Davis' knotweed
Polygonum davisiae, a dicot, is a perennial herb that is native to California and is also found outside of California, but is confined to western North America.

 Interactive Distribution Map 

 Observation Hotline 
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 Plant Characteristics
 and Associations

Bloom Period
Polygonum davisiae
© 2005 Steve Matson
Red Fir Forest, Lodgepole Forest, Subalpine Forest
Wetlands:Occurs in wetlands in another region, but occurs almost always under natural conditions in non wetlands in California [U.S. Fish & Wildlife Service.]
Genus: Polygonum
Distribution by County 

Add an Observation of  Polygonum davisiae

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

PLANTS: Aconogonon davisiae
PLANTS: Aconogonum davisiae var. glabrum
PLANTS: Aconogonum davisiae
PLANTS: Aconogonum newberryi
PLANTS: Polygonum newberryi var. glabrum
PLANTS: Polygonum newberryi
 NOTE: Polygonum davisiae is not an active name in the Calflora species table.
 Information about  Polygonum davisiae  from other sources:

Nursery availability and horticultural info on CNPLX

Photos on CalPhotos / Google Images

website references on Google

Original Publication citation. on the
International Plants Names Index

Search (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]. 2015. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Jul 07, 2015).

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

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