Calflora, a 501c3 non-profit
Distribution by County   6755    
Polygonum hydropiperoides  Michx.

(not an active name)
Swamp smartweed,   Water pepper
Polygonum hydropiperoides is a perennial herb that is native to California, and also found elsewhere in North America and beyond.
also called Persicaria hydropiperoides
Record Count by County

Alameda: 2 Lake: 3 Orange: 16 Solano: 5
Amador: 2 Los Angeles: 39 Placer: 2 Sonoma: 11
Butte: 27 Madera: 3 Plumas: 1 Sutter: 3
Contra Costa: 10 Marin: 4 Riverside: 13 Tehama: 2
El Dorado: 13 Mariposa: 2 Sacramento: 21 Tulare: 2
Fresno: 3 Mendocino: 5 San Bernardino: 17 Tuolumne: 1
Glenn: 2 Merced: 7 San Diego: 5 Ventura: 7
Humboldt: 2 Modoc: 1 San Joaquin: 9 Yuba: 1
Imperial: 2 Napa: 3 San Mateo: 7
Kern: 2 Nevada: 2 Santa Cruz: 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: 11/21/2024).