Calflora
Taxon  Report   11038    
Polygonum sawatchense  Small  ssp. sawatchense 
Knotweed
Polygonum sawatchense ssp. sawatchense, a dicot, 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
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial

Bloom Period

Wetlands: Occurs usually in non wetlands, occasionally in wetlands
Name Status:
Accepted by JEF
Alternate Names:
JEFPolygonum douglasii ssp. johnstonii
JEFPolygonum douglasii var. johnstonii
JEFPolygonum exile
JEFPolygonum triandrum
More information about  Polygonum sawatchense ssp. sawatchense
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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]. 2022. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/20/2022).