Calflora
Taxon  Report   6752    
Polygonum douglasii  Greene  ssp. majus  (Meisn.) J. C. Hickman  
(no longer an active name)
Large douglas' knotweed,  Large knotweed
Polygonum douglasii ssp. 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
Parent: Polygonum douglasii
Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Serpentine affinity: 1.5; (weak indicator)

Name Status:
Accepted by PLANTS

JEF other name:
Polygonum majus

Alternate Names:
PLANTS: Polygonum coarctatum var. majus
PLANTS: Polygonum majus
NOTE: Polygonum douglasii ssp. majus is no longer an active name.
More information about  Polygonum douglasii ssp. majus
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (PODOM2)


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).