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Flaigg, Norman G.
Polygonum amphibium var. emersum
Polygonum amphibium L. var. emersum Michx.
Synonym(s): Persicaria amphibia, Persicaria amphibia var. emersa, Persicaria coccinea, Persicaria muehlenbergii, Polygonum amphibium var. coccineum, Polygonum coccineum, Polygonum coccineum var. pratincola, Polygonum coccineum var. terrestre, Polygonum muehlenbergii, Polygonum muehlenbergii var. terrestre
USDA Symbol: POAME
USDA Native Status: L48 (N), CAN (N)
Polygonum amphibium var. emersum has lanceolate leaves with narrowly tapering tips and slender flower clusters at least 1 1/2 inches (4 cm) long. Once called P. coccineum, a separate species, this variety of Polygonum amphibium is aggressive to the point of being classified as a noxious weed.
Bloom InformationBloom Color: Red , Pink
Bloom Time: Jun , Jul , Aug , Sep
, WY Canada: NB
Growing ConditionsAquatic: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2013-05-07
Research By: TWC Staff