Calflora
Taxon  Report   6743    
Polygonum californicum  Meisn.
California knotweed
Polygonum californicum
© 2004 Steve Matson
Photos from
CalPhotos / Calflora
Polygonum californicum
© 2015 John Doyen
Polygonum californicum
© 2015 John Doyen
Polygonum californicum, a dicot, is an annual herb that is native to California, is also found outside of California, but is confined to western North America.

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

Plant Characteristics
and Associations



Bloom Period
Polygonum californicum
© 2015 John Doyen
Family: POLYGONACEAE  
Genus: Polygonum
Communities: Foothill Woodland, Northern Oak Woodland, Yellow Pine Forest
Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Polygonum greenii
More information about  Polygonum californicum
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on PlantID.net   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (POCA7)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

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: https://www.calflora.org/   (Accessed: Nov 16, 2018).

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