Calflora, a 501c3 non-profit
Distribution by County   6764    
Polygonum persicaria  L.

(not an active name)
Lady's thumb,   Spotted ladysthumb
Polygonum persicaria is an annual herb that is not native to California.
also called Persicaria maculosa
Record Count by County

Alameda: 5 Kern: 10 Orange: 5 Shasta: 6
Alpine: 1 Lake: 3 Placer: 3 Sierra: 4
Amador: 2 Lassen: 4 Plumas: 18 Siskiyou: 7
Butte: 53 Los Angeles: 7 Riverside: 4 Solano: 6
Calaveras: 2 Madera: 1 Sacramento: 27 Sonoma: 7
Colusa: 5 Marin: 23 San Bernardino: 14 Stanislaus: 5
Contra Costa: 2 Mariposa: 5 San Diego: 14 Sutter: 9
Del Norte: 5 Mendocino: 7 San Francisco: 7 Tehama: 10
El Dorado: 4 Merced: 8 San Joaquin: 6 Trinity: 4
Fresno: 3 Modoc: 14 San Luis Obispo: 9 Tulare: 8
Glenn: 6 Mono: 1 San Mateo: 24 Tuolumne: 2
Humboldt: 24 Monterey: 7 Santa Barbara: 2 Ventura: 9
Imperial: 5 Napa: 8 Santa Clara: 8 Yolo: 9
Inyo: 10 Nevada: 6 Santa Cruz: 10 Yuba: 9

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: 05/14/2024).