Calflora
Taxon  Report   11010    
Persicaria lapathifolia  (L.) Delarbe
Common knotweed
Persicaria lapathifolia, a dicot, is an annual herb that is native to California, and also found elsewhere in North America and beyond.
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial

Bloom Period
Family: Polygonaceae  
Genus: Persicaria

Wetlands: Occurs usually in wetlands, occasionally in non wetlands

Communities: wetland-riparian, many plant communities

Name Status:
Accepted by JEF
Alternate Names:
JEFPolygonum lapathifolium var. salicifolium
JEFPolygonum lapathifolium
JEFPolygonum scabrum
More information about  Persicaria lapathifolia
International Plants Names Index

Search efloras.org (Flora of North America)

Landscape information from Calscape

Photos on PlantID.net   /   Google Images

Consortium of California Herbaria 2

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]. 2021. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 10/24/2021).