Water knotweed (Polygonum amphibium)

Persicaria amphibia

Summary 2

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. It is native to much of North America, Asia, Europe, and parts of Africa, and it is known elsewhere as an introduced species and sometimes a noxious weed.

Sources and Credits

  1. (c) Jörg Hempel, some rights reserved (CC BY-SA), http://www.flickr.com/photos/32023375@N06/6945554552
  2. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Persicaria_amphibia

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