Photo: Polygonum aviculare 3.

Flowers and leaf. Tammisaari archipelago, Finland. Wild. 2006-07-23.
Polygonum aviculare L. Engl.: prostrate knotweed, knotgrass, knotweed. Deu.: Vogelknöterich, Knotenwegerich, Wegtritt. Suom.: pihatatar. Sven.: trampört, trampgräs. TCM: bian xu
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Photo: Polygonum aviculare 3.