Photo: Pycnanthemum verticillatum 9.

Flowers. Annala, Helsinki, Finland. Planted. 2004-10-07.
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 9.