Polygonum bistortoides Calflora

Distribution by County 6741

Polygonum bistortoides Pursh

(not an active name)

American bistort, Snakeweed, Western bistort, Western knotweed

Polygonum bistortoides is a perennial herb that is native to California, and also found elsewhere in North America and beyond.

also called Bistorta bistortoides

Record Count by County


Alpine: 28	Humboldt: 13	Mono: 54	Solano: 3
Amador: 1	Kern: 1	Nevada: 58	Sonoma: 1
Butte: 28	Lake: 1	Placer: 48	Tehama: 16
Calaveras: 1	Lassen: 32	Plumas: 43	Trinity: 16
Colusa: 2	Madera: 12	Riverside: 16	Tulare: 81
Del Norte: 1	Marin: 9	San Bernardino: 41	Tuolumne: 90
El Dorado: 51	Mariposa: 80	Shasta: 6
Fresno: 64	Mendocino: 11	Sierra: 57
Glenn: 9	Modoc: 7	Siskiyou: 18

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: 11/21/2024).