Calflora
Taxon  Report   11035    
Polygonum majus  (Meisn.) Piper
Large douglas' knotweed
Polygonum majus, a dicot, is an annual herb that is native to California, is also found outside of California, but is confined to western North America.

Bloom Period
Family: POLYGONACEAE  
Genus: Polygonum
Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Serpentine affinity: 1.5; (weak indicator)

Name Status:
Accepted by JEF

PLANTS other name:
Polygonum douglasii ssp. majus

Alternate Names:
JEF: Polygonum douglasii ssp. majus
More information about  Polygonum majus
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (PODOM2)

Search efloras.org (Flora of North America)

Landscape information from Calscape

Photos on PlantID.net   /   Google Images

Consortium of California Herbaria


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: https://www.calflora.org/   (Accessed: Aug 22, 2019).