Mentha japonica

Family Lamiaceae (alt. Labiatae)
Subfamily Nepetoideae
Tribe Mentheae
Scientific name Mentha japonica (Miquel) Makino
Synonyms Micromeria japonica Miquel; Satureia japonica (Miquel) Matsumura et Kudô
Common name (Japanese common name) hime-hakka (ヒメハッカ, 姫薄荷 [meaning: dwarf mint])
(English common name) Japanese wild mint
Distribution (Japan) Hokkaido, Honshu
(Other nations) none
Habitat Swamp
Chromosomal number 2n=72, 96
Description Plants electing 20-40cm tall. Leaves 1-2cm long, 3-8mm wide. Flowers calyxs 2-2.5mm long, white or pale purple corollas ca. 3.5mm long, 4 stamens, flowering in August to October. Fruits ca. 0.8mm long. Perennial plants.
Reference Mentha japonica (Miq.) Makino
Note Native to Japan. Rare species.

August 2007
at lowland swamp
August 2007
at lowland swamp