Ruiyou peony - Ruiyou peony

Japanese: ルイヨウボタン - るいようぼたん

Its leaves resemble those of the peony, hence the name Ruiyobotan (a type of peony) (illustration). It is a perennial plant of the Berberidaceae family that grows in relatively dark and damp places in deep mountains. It is 40-70cm tall and hairless. It has several scale leaves at the base. The leaves are alternate in pairs, with the lower leaves being trifoliate and the upper leaves being bifoliate. Inflorescences emerge from the tip of the stem and the upper leaf axils. The flowers are an inconspicuous yellow-green color. There are usually nine sepals, with the inner six being large and petal-like. The petals are extremely small and nectar-like.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

葉がボタンの葉に似ることから，ルイヨウボタン(類葉牡丹)の名がある（イラスト）。深山の比較的暗く湿った所に生育するメギ科の多年草。高さ40～70cmで，無毛。基部に数枚の鱗片葉をつける。葉は2枚で互生し，下の葉は3回3出複葉，上の葉は2回3出複葉。茎の先端と，上部の葉腋（ようえき）から花序がでる。花はめだたない黄緑色。萼片は通常9枚で，内側の6枚は花弁状に大きくなっている。花弁は極端に小さく蜜腺状になる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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