Photo: Mentha x piperita 4.

Flowering patch. Annala, Helsinki, Finland. Planted. 2003-09-08.
Mentha x piperita L. Engl.: peppermint, black peppermint, chocolate mint. Deu.: Pfefferminze. Suom.: piparminttu. Sven.: pepparmynta. Fran.: menthe poivrée. Ital.: menta. Bot. syn.: See Mentha aquatica L. x spicata L.., Mentha dumetorum Schultes
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Photo: Mentha x piperita 4.