Calflora, a 501c3 non-profit
Distribution by County   11038    
Polygonum sawatchense  Small  ssp. sawatchense 
Knotweed
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
Record Count by County

Alpine: 2 Lassen: 13 Placer: 3 Siskiyou: 15
Colusa: 1 Madera: 1 Plumas: 15 Tehama: 1
El Dorado: 3 Mariposa: 1 San Bernardino: 18 Trinity: 2
Fresno: 2 Modoc: 12 San Diego: 9 Tulare: 7
Humboldt: 3 Mono: 23 Shasta: 4 Tuolumne: 3
Inyo: 13 Nevada: 8 Sierra: 1 Ventura: 3

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: 04/18/2024).