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Native Plant Database

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Polygonum amphibium var. emersum (Longroot smartweed)
Flaigg, Norman G.

Polygonum amphibium var. emersum Michx.

Longroot smartweed

Polygonaceae (Buckwheat Family)

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.

 

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Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit:

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 , WY
Canada: NB
USDA Native Status: L48(N), CAN(N)

Growing Conditions

Aquatic: yes

Recommended Species Lists

Find native plant species by state. Each list contains commercially available species suitable for gardens and planned landscapes. Once you have selected a collection, you can browse the collection or search within it using the combination search.

View Recommended Species page

Additional resources

USDA: Find Polygonum amphibium var. emersum in USDA Plants
FNA: Find Polygonum amphibium var. emersum in the Flora of North America (if available)
Google: Search Google for Polygonum amphibium var. emersum

Metadata

Record Modified: 2013-05-07
Research By: TWC Staff

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