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Polygonum amphibium var. stipulaceum (Water smartweed)
Bransford, W.D. and Dolphia

Polygonum amphibium var. stipulaceum

Polygonum amphibium L. var. stipulaceum Coleman

Water Smartweed

Polygonaceae (Buckwheat Family)

Synonym(s): Persicaria amphibia var. stipulacea, Persicaria mesochora, Persicaria nebraskensis, Polygonum amphibium ssp. laevimarginatum, Polygonum amphibium var. hartwrightii, Polygonum coccineum var. rigidulum, Polygonum fluitans, Polygonum hartwrightii, Polygonum inundatum, Polygonum natans


USDA Native Status: L48 (N), AK (N), CAN (N), SPM (N)

Polygonum amphibium var. stipulaceum has short oval flower clusters and is not especially aggressive. The pink flower masses of this variety of Polygonum amphibium are very attractive, but since the plants grow quickly, they can become an unwelcome weed in decorative ponds.


From the Image Gallery

3 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Achene
Size Notes: Stems prostrate to ascending to erect, up to about 4 feet long in terrestrial plants, up to about 10 feet in some aquatic plants.

Bloom Information

Bloom Color: Red , Pink
Bloom Time: Jun , Jul , Aug , Sep


USA: AK , AZ , CA , CO , CT , DC , DE , IA , ID , IL , IN , KS , KY , MA , MD , ME , MI , MN , MO , MT , ND , NE , NH , NJ , NM , NV , NY , OH , OR , PA , RI , SD , UT , VA , VT , WA , WI , WY
Canada: AB , BC , MB , NB , NL , NS , NT , ON , PE , QC , SK , YT

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Santa Barbara Botanic Garden - Santa Barbara, CA

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

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


Record Modified: 2023-05-02
Research By: TWC Staff

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