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Flaigg, Norman G.
Polygonum amphibium var. emersum Michx.
Synonyms: Polygonum coccineum, Persicaria amphibia
USDA Symbol: POAME
USDA Native Status: Native to U.S.
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.
AR , AZ , CA , CO , CT , DC , DE , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY Canada: NB USDA Native Status: L48(N), CAN(N)
Growing ConditionsAquatic: yes
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Record Modified: 2013-05-07
Research By: TWC Staff