They are a perennial plant that grows in the pool of forests in the forests in the mountain districts. (Perennial plant takes several years to grow). They expand black-purple vine to the vegetation in that area to twine around it. They grow in the fields like Vigna unguiculata (Leguminosae) which is edible do. Therefore, they are named after this. The flower is about 1.5 to 2 cm long with the top being like a butterfly-shaped. On inflorescence (Kajo: stalk blooming flowers) grown from the side of the leaf, about 3 to 10 flowers to bloom downward. The calyx at the root of the flowers is a cylindrical shape in pale lime green color with sepal split shallow. The leaf consists of 3 leaves as one and grows alternative on the stalk. Lobules are long egged-shaped about 3 to 15 cm long (Shoyo: each one that is leaf-shaped and leaf like one consisting of more than a few leaves). The characteristic of the leaf is thin and sparse paraphyllium grows with the back white-fleshed. When the flowers wither, they bear the hull-shaped seeds. When matured, the seeds are split out spherical seedling dangling, about 5 mm in diameter.

●Season　　Early September to about Mid September
●Height　　 – climbing plant
●Place　　Trail 1 to 2, Trail 4 to 5, Oku-Takao