Korea Flora: Vines with leaves elongated and without hairs on the branches. bark brown and  stem thick. winter buds usually hidden in leaf scars. leaf semi-circular, with a rounded, slightly pointed or notched edge, and divided into 3-5 parts, 4.5-7 (13) cm x 4.5-8 (11) cm, teeth on the margins slightly blunt without hairs on the surface, and with fine hairs on the back. leaf petiole 2-5 (7) cm long with hairs or sometimes without. flowers bisexual, with several flowers arranged in a cluster, and peduncles arranged in pairs facing the leaves. flowers green with peduncles  3-4 cm long, 3-8 cm wide, five sepals, one pistil and one stamen.  fruit and seeds  round or flattened, with a diameter of 8-10 mm and brown lenticels.

Flowering mid-June to late June
Fruiting late August to mid-October
Distribution: Myanmar, India, Nepal, central and southern China, the southern Kuril Islands in the far east of Russia, and Hokkaido to Kyushu in Japan; widely distributed in the Korean peninsula

Japan Flora: Herbaceous vine, woody at base; branches terete, glabrous or with pale brown multicellu­lar spreading hairs, the nodes slightly thickened and jointed; leaves cordate, 3 (-5)-lobed, 4-12 cm. long, 4-10 cm. wide, paler and thinly pilose beneath, with obtuse or acute-mucro­nate teeth, the median lobes ovate-deltoid, the lateral lobes smaller; inflorescence many-flowered, 3-6 cm. across; flowers about 3 mm. across; petals narrowly ovate-triangular, about 2.5 mm. long, deciduous; disc erect, entire; fruit globose, gla­brous, 6-8 mm. across, purplish to blue in maturity; seeds 2, rarely 1 or 3, about 4 mm. long, orbicular with an extended tip, rounded at back.  Thickets in hills.

Hokkaido, Honshu, Shikoku, Kyushu; very common and variable. Korea,