"Noji-sumire" (Viola yedoensis) belongs to the Violaceae (the Viola family). It is an evergreen perennial herb that distributed from Honshu to Shikoku, Kyushu of Japan, as well as the southern Korean Peninsula and central China. This herb grows on sunny roadsides, fields and can reach about 10 cm in height. It has fully whitish short hairs, and the leaves are elliptic-lanceolate with petioles that has scarcely any wings. The pale purple to pale magenta flowers come in March to April.