Taxon  Report   6764 
Polygonum persicaria  L.   (not an active name; please see Persicaria maculosa)
lady's thumb,  spotted ladysthumb
Polygonum persicaria, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.

 Interactive Distribution Map 

 Observation Hotline 
 (observation details + photos)

point, line, or polygon

 Plant Characteristics
 and Associations

Bloom Period
Polygonum persicaria
© 2007 Neal Kramer
Polygonum persicaria
© 2004 Carol W. Witham
weed, characteristic of disturbed places, wetland-riparian
Habitat: disturbed [Walker]
Wetlands:Usually occurs in wetlands, but occasionally found in non wetlands [U.S. Fish & Wildlife Service.]
Genus: Polygonum
Distribution by County 

Add an Observation of  Polygonum persicaria

Name Status:
Accepted by PLANTS + JM93
TJM2 accepted name: Persicaria maculosa
 NOTE: Polygonum persicaria is not an active name in the Calflora species table.
 Information about  Polygonum persicaria  from other sources:

Photos on CalPhotos / Google Images

website references on Google

UC Integrated Pest Management Weed Photo Gallery
(profile of this plant as an agricultural weed)

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: Jul 01, 2015).

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

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