Polygonum douglasii ssp. majus Calflora

Distribution by County 6752

Polygonum douglasii Greene ssp. majus (Meisn.) J. C. Hickman

(not an active name)

Large douglas' knotweed, Large knotweed

Polygonum douglasii ssp. majus is an annual herb that is native to California, and also found elsewhere in western North America.

also called Polygonum majus

Record Count by County


Alpine: 1	Kern: 2	Mono: 2	Shasta: 9
Butte: 1	Lake: 1	Napa: 1	Siskiyou: 8
El Dorado: 1	Lassen: 4	Plumas: 3	Trinity: 6
Inyo: 1	Modoc: 5	San Bernardino: 1

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]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/ (Accessed: 05/18/2024).