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"Ooba-kusafuji" (Vicia pseudo-orobus) belongs to Fabaceae (the Pea family). It is a perennial herb that is distributed in various parts of Japan, as well as the Korean Peninsula, China, and Siberia. It grows on hillsides to forest edges of mountainous terrain, twining around by its tendrils, and grows 80 to 150 cm tall. The leaves are even-pinnate compound with two to five pairs of elliptic ovate to long ovate leaflets. From August to October, racemes emerge from the leaf axils and blue-purple papillionaceous flowers bloom. The fruit is an oblong pea pod. In Chinese, it is called "大葉野豌豆" (da ye ye wan dou).
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