Setsubunsou (Setsubun grass) - Setsubunsou (English spelling) Eranthis pinnatifida

Japanese: セツブンソウ(節分草) - セツブンソウ（英語表記）Eranthis pinnatifida

A small perennial plant of the Ranunculaceae family. It is distributed in Honshu from the Kanto region westward, and grows in the shade of trees on the mountains. There is a spherical tuber underground, from the top of which stems and leaves grow, and fibrous roots grow from the bottom. The basal leaves have thin petioles 5 to 10 cm long, and the almost pentagonal leaf blade is deeply lobed into three parts, the lateral parts are further deeply lobed into two parts, and each lobe is pinnately incised. In spring, very early, a sessile leaf (involute) deeply lobed in several places appears at the top of the stem, and a single white flower 2 cm in diameter appears at the top of the leaf. There are five large white petal-like sepals, and the petals are yellow, small, bifurcated, and have nectar glands at the base. There are many stamens with pale purple anthers. There are 1 to 5 carpels. It is named after the fact that it blooms around the time of Setsubun.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

キンポウゲ科の小型の多年草。関東以西の本州に分布し，山の木陰に生える。地中に球状の塊茎があり，その頂部から茎や葉が伸び，下部からひげ根を出す。根出葉は5～10cmの細い葉柄があり，ほぼ五角形の葉身は3深裂し，側片はさらに2深裂したうえ，各裂片は羽状に切れ込んでいる。春，非常に早く，茎の頂部に深くいくつにも裂けた無柄の葉 (総包) がつき，さらにその上部に径 2cmの白花を1個つける。萼片は5枚あり白色の花弁状で大きく，花弁は黄色で小さくふたまたに分れて基部に蜜腺をつける。淡紫色の葯 (やく) をもった多数のおしべがある。心皮は1～5個。節分の頃開花するのでこの名がある。

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