Photo: Galeopsis tetrahit 1.

Closeup of flower. Säppi, Finland. Wild. 2000-08-16.
Galeopsis tetrahit L. Engl.: common hempnettle, brittlestem hempnettle, hempnettle. Deu.: Gewöhnlicher Hohlzahn. Suom.: karheapillike. Sven.: pipdån, röddån. Bot. syn.: Galeopsis carthusianorum auct.
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Photo: Galeopsis tetrahit 1.