Wild pea (Dumasia truncata Sieb.et Zucc.)

Japanese: ノササゲ(野豇豆) - ノササゲ（英語表記）Dumasia truncata Sieb.et Zucc.

A perennial climbing plant of the legume family found on mountain forest edges (illustration). The leaves are alternate on the stem, compound with 3 leaflets and stipules at the base. The leaflets are thin and glabrous on the upper surface, while the underside is greenish-white with sparse short hairs that lie down. The terminal leaflet is oblong, 3-15 cm long and 2-6 cm wide. The flowers are pale yellow, butterfly-shaped, 15-20 mm long, and bloom in August and September in clusters growing from the leaf axils. The calyx lobes are barely noticeable. The fruit is glabrous, 4-5 cm long, dark purple when ripe, and contains 3-5 seeds.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

山地の林縁などにみられるマメ科のつる性多年草（イラスト）。葉は茎に互生し，3小葉をもつ複葉で基部に托葉がある。小葉は薄質で，表面は無毛，裏面は緑白色でまばらに伏した短毛が生える。頂小葉は長卵形で長さ3～15cm，幅2～6cm。花は淡黄色の蝶形花で，長さ15～20mm，8～9月に葉腋（ようえき）から伸びる穂に集まって咲く。萼の裂片はほとんど目立たない。果実は無毛，長さ4～5cm，熟すと濃紫色となり，3～5個の種子を入れる。

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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