Calflora
Taxon  Report   6751    
Polygonum douglasii  Greene  ssp. johnstonii  (Munz) J. C. Hickman  
(no longer an active name)
Johnston's knotweed,  Knotweed
Polygonum douglasii ssp. johnstonii, 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
Name Status:
Accepted by PLANTS

JEF other name:
Polygonum sawatchense ssp. sawatchense

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

USDA PLANTS Profile (PODOJ2)


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 20, 2019).