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"Ezo-no-tachitsubo-sumire" (Viola acuminata) belongs to Violaceae (the Viola family). It is a perennial herb that is distributed from Okayama Prefecture northward to Tohoku district of Honshu and Hokkaido in Japan, as well as the southern Kuril Islands, the Korean Peninsula, and northeastern China. It grows in rather cold deciduous forests and grasslands, and grows 20 to 40 cm tall. The basal leaves are ovate to heart-shaped, and the stem leaves are long-triangular to heart-shaped. The spur is white and the sepals are covered with fine hairs. The Chinese name for this plant is "鶏腿菫菜" (ji tui jin cai).
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