Calflora
Taxon  Report   6740    
Polygonum bidwelliae  S. Watson
Bidwell's knotweed
Polygonum bidwelliae
© 2010 George W. Hartwell
Photos from
CalPhotos / Calflora
Polygonum bidwelliae, a dicot, is an annual herb that is native to California, is endemic (limited) to California.
CNPS Rare Plant Rank: 4.3 (limited distribution).   8th Edition

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Polygonum bidwelliae
© 2010 George W. Hartwell
Family: POLYGONACEAE  
Genus: Polygonum
Communities: Chaparral, Valley Grassland, Foothill Woodland
Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
PLANTS: Duravia bidwelliae
More information about  Polygonum bidwelliae
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 (POBI4)

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 17, 2018).

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