Taxon  Report   6774    
Polygonum shastense  W. H. Brewer
Shasta knotweed
Polygonum shastense
© 2003 Penn Martin II
Photos from
CalPhotos / Calflora
Polygonum shastense
© 2010 Keir Morse
Polygonum shastense
© 2006 Steve Matson
Polygonum shastense, a dicot, is a perennial 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)

point, line, or polygon

Plant Characteristics
and Associations

Bloom Period
Polygonum shastense
© 2010 Keir Morse
Genus: Polygonum
Communities: Lodgepole Forest, Subalpine Forest
Name Status:
Accepted by JEF + PLANTS

More information about  Polygonum shastense
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 21, 2019).