Photo: Pycnanthemum verticillatum.

Flowering tops. Annala, Helsinki, Finland. Planted. 1999-08-24.
Pycnanthemum verticillatum (Michx.) Pers. Engl.: whorled mountain mint, American mountain-mint. Deu.: Amerikanische Bergminze. Bot. syn.: Koellia pilosa (Nutt.) Britt.
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Photo: Pycnanthemum verticillatum.