Photo: Polygonum amphibium 0.
Botanical name:
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
