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Swamp Smartweed (Persicaria hydropiperoides (Michx.) Small)

Also classified as Polygonum hydropiperoides Michx..

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Range - Expand

Native or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.


The proposed variety Polygonum hydropiperoides var. setaceum (Baldwin) Gleason, originally proposed to belong to this species, was separated into the species Persicaria setacea. The USDA never included this variety in this taxon, however, so there are no inconsistencies in maps resulting from this reclassification.

Polygonum hydropiperoides (swamp smartweed) | USDA PLANTS Database (About This Site)

Persicaria hydropiperoides | Biota of North America Project (BONAP) (About This Site)