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Curlytop Knotweed

Scientific Name:

Polygonum lapathifolium


Herbaceous Plant


Swampy thickets


North America, considered native across the United States lower 48, and invasive in Canada


No listed status

This species is


to the Truckee Meadows.


This broadleaf plant is typically found in wetland habitats across North America. It grows to be 2 to 5 feet in height and is characterized by its smooth stems and typically white or pale rose flowers which bloom from July through October.

Fast Facts:

  • Curlytop knotweed has been used to aid with stomach pain and fevers by the Cherokee Tribe. It has also been used by the Cherokee as a rub to reduce the reaction of poison ivy on the skin. The plant is able to produce a froth similar to soap - which is used to cleanse the wounded area. Chippewa and Iroquois people have also used the plant for medicinal purposes.

  • Curlytop knotweed is a hermaphrodite, both female and male reproductive systems exist on this plant. This makes it easy for the plant to reproduce quickly which is why it is considered invasive in certain areas.

  • This plant is a member of the buckwheat family!



Bridget Mulkerin (research & content)

Alex Shahbazi (edits & page design)

Last Updated:

June 17, 2021 at 6:58:29 PM

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