Polygonum sawatchense ssp. sawatchense Calflora

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Taxon Report

Polygonum sawatchense Small ssp. sawatchense

Knotweed

2019 Susan McDougall

2009 Barry Breckling

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

also called Polygonum douglasii ssp. johnstonii


	Plant Range Observation Search ~146 records in California Plant Characteristics

Bloom Period

Photos on Calflora


Parent:	Polygonum sawatchense
Genus:	Polygonum
Family:	Polygonaceae
Category:	angiosperm
PLANTS group:	Dicot
Jepson eFlora section: eudicot

Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Name Status:
Accepted by JEF

Alternate Names:


JEF	Polygonum douglasii ssp. johnstonii
JEF	Polygonum douglasii var. johnstonii
JEF	Polygonum exile
JEF	Polygonum triandrum

Information about Polygonum sawatchense ssp. sawatchense from other sources


Nursery availability from CNPLX Commercial availability unknown. Jepson eFlora Photos on Calflora Photos on CalPhotos Google Images Photos on iNaturalist ID Tips on PlantID.net	International Plants Names Index Search efloras.org (Flora of North America) Landscape information from Calscape Consortium of California Herbaria 2 Search the Native American Ethnobotany Database	Add an Observation Location Suitability Planting Guide Distribution by County
photos / record / common / links po137062:!null:!null:!

Suggested Citation

Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/ (Accessed: 07/19/2025).