Photo: Polygonum amphibium.

Leaves on water. Perheniemi, Finland. Wild. 1999-07-05.
Polygonum amphibium L. Engl.: amphibious bistort, longroot smartweed, water knotweed, water persicaria, water smartweed, willow-grass. Deu.: Wasser-Knöterich. Suom.: vesitatar. Sven.: vattenpilört, grodpilört. Bot. syn.: Persicaria amphibia (L.) Gray
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Photo: Polygonum amphibium.