Polygonum amphibium L.
Engl.: amphibious bistort, longroot smartweed, water knotweed, water persicaria, water smartweed, willow-grass.
Deu.: Wasser-Knöterich.
Sven.: vattenpilört, grodpilört.
Suom.: vesitatar.
Bot. syn.: Persicaria amphibia (L.) Gray.
Classic texts: King's 1898.
Leaf on water. Tapanila, Helsinki, Finland. Wild. 2012-06-13.
Leaf on water. Tapanila, Helsinki, Finland. Wild. 2012-06-13.
Classic texts: Rafinesque 1828-1830.
Classic texts: USDisp 1918.
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