Viola raddeana ("Tachisumire")

Japanese name: タチスミレ （立菫）
Scientific name: Viola raddeana

[Overview]
A perennial 30–50 cm tall, sometimes reaching 1 m, found in reed beds in low-lying wetlands and in riverside forests.
It has a short rhizome.
Two or three aerial stems stand upright.
The leaves are of two kinds, basal leaves and leaves arranged alternately on the stem; a few basal leaves appear, and they have often withered by flowering time.
The leaves are triangular-lanceolate, 4–8 cm long, with low wavy teeth on the margin, and are hairless on both sides.
The petiole is 2–5 cm long and hairless.
The stipules are lanceolate, 3–6 cm long, toothed, and look like stem leaves.
The flowers are borne at the tips of flower stalks rising upright from the leaf axils; they are white to pale purple, about 1 cm across, with purple streaks in the center of the lip petal.
The bases of the lateral petals are hairy, and behind the flower is a thick, short spur 1–2 mm long.
The fruit is a capsule that splits into 3 when ripe and scatters the seeds.

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