Calflora, a 501c3 non-profit
Distribution by County   11035    
Polygonum majus  (Meisn.) Piper
Large douglas' knotweed
Polygonum majus is an annual herb that is native to California, and also found elsewhere in western North America.
Record Count by County

Alpine: 1 Kern: 2 Mono: 2 Shasta: 6
Butte: 1 Lake: 1 Napa: 1 Siskiyou: 3
El Dorado: 1 Lassen: 3 Plumas: 2 Trinity: 6
Inyo: 1 Modoc: 4 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: 11/21/2024).