Calflora, a 501c3 non-profit
Distribution by County   6738    
Polygonum argyrocoleon  Kunze
Persian knotweed,   Silver sheath knotweed,   Silversheath knotweed
Polygonum argyrocoleon is an annual herb that is not native to California.
Record Count by County

Contra Costa: 2 Los Angeles: 49 Sacramento: 4 Sonoma: 1
El Dorado: 7 Marin: 2 San Bernardino: 22 Stanislaus: 2
Fresno: 10 Merced: 2 San Diego: 18 Tehama: 1
Humboldt: 1 Mono: 1 San Luis Obispo: 2 Tulare: 1
Imperial: 14 Monterey: 1 San Mateo: 1 Ventura: 17
Inyo: 4 Napa: 1 Santa Barbara: 11 Yolo: 2
Kern: 8 Orange: 14 Santa Clara: 2
Lake: 1 Placer: 1 Sierra: 2
Lassen: 1 Riverside: 29 Solano: 33

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).