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(Upload on December 8 2020) [ 日本語 | English ]

Mentha L. (ハッカ) Koshouhakka (コショウハッカ, 胡椒薄荷), peppermint Seiyouhakka (セイヨウハッカ, 西洋薄荷) Lifeform: perennial forb, with 30-90 cm in height Distribution: native to Europe (exotic to Japan) Habitat: escaped to sunny and mesic grasslands Chromosome number: 2n = 72, 84 or 108 Use: herbal medicine by 1-menthol, etc. Putative hybrid: between M. aquatica × M. spicata

Figure. The leaves of peppermint (Mentha × piperita L.) cultivars: 1 Almira, 2 Asia, 3 Citaro, 4 Chocolate, 5 Granada, 6 Grapefruit, 7 Multimentha, 8 Swiss (Kiełtyka-Dadasiewicz et al. 2017)

Mentha × piperita in Hokkaido

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1 2 3
[1-3] in a small flower garden along a paved road in N11/W2, North Ward, Sapporo, on September 30 2020. Records: in Experimental Station for Medical Plant Studies, Faculty of Medicine, Hokkaido University, on November 16 2020.