Native Plants
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Polygonum amphibium var. emersum
Polygonum amphibium L. var. emersum Michx.
Longroot Smartweed
Polygonaceae (Buckwheat Family)
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 Information
Bloom Color: Red , PinkBloom Time: Jun , Jul , Aug , Sep
Distribution
USA: 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 , WYCanada: NB
Growing Conditions
Aquatic: yesNational Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | OBL | OBL | OBL | OBL | OBL | OBL | OBL | OBL |
Additional resources
USDA: Find Polygonum amphibium var. emersum in USDA PlantsFNA: Find Polygonum amphibium var. emersum in the Flora of North America (if available)
Google: Search Google for Polygonum amphibium var. emersum
Metadata
Record Modified: 2019-12-03Research By: TWC Staff