Water smartweed
Persicaria amphibia (L.) Delarbre
Genus Persicaria. Family Polygonaceae.
Photo: Wikipedia, Pethan
Description
Persicaria amphibia (syn. Polygonum amphibium) is a species of flowering plant in the knotweed family known by several common names, including longroot smartweed, water knotweed, water smartweed, and amphibious bistort.Wikipedia
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Photographs
Photo: Галины Ясиницкой
Photo: Richard Wesley
Photo: Wikipedia
Public domain