Calflora
Taxon  Report   6735    
Polygonum amphibium  L.  var. emersum  Michx.

(no longer an active name)

Kelp,   Longroot smartweed,   Swamp knotweed,   Water smartweed
Polygonum amphibium var. emersum, a dicot, is a perennial herb (aquatic) 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: Polygonum
Parent: Polygonum amphibium

Communities: wetland-riparian
Name Status:
Accepted by PLANTS

Alternate Names:
PLANTSPersicaria amphibia var. emersa
PLANTSPersicaria amphibia
PLANTSPersicaria coccinea
PLANTSPersicaria muehlenbergii
PLANTSPolygonum amphibium var. coccineum
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More information about  Polygonum amphibium var. emersum

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: 06/23/2021).