Taxon  Report   11010 
Persicaria lapathifolia  (L.) Delarbe
Common knotweed
Persicaria lapathifolia
© 2008 Louis-M. Landry
More photos from
CalPhotos / Calflora
Persicaria lapathifolia
© 2009 Phil Pullen
Persicaria lapathifolia
© 2005 Luigi Rignanese
Persicaria lapathifolia, 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
Persicaria lapathifolia
© 2008 Louis-M. Landry
Genus: Persicaria
(many plant communities), wetland-riparian
Wetlands: Occurs usually in wetlands, occasionally in non wetlands
Distribution by County 

Add an Observation of  Persicaria lapathifolia

Name Status:
Accepted by JEF
PLANTS accepted name: Polygonum lapathifolium
Alternate Names:
(according to)

ICPN: Polygonum lapathifolium
More information about  Persicaria lapathifolia
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on CalPhotos / Google Images
Photos on

Jepson eFlora

Records from the Consortium of California Herbaria


Search (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]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available:   (Accessed: Jul 22, 2018).

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