Korea Flora: Deciduous vine. Height up to 10m. Branchlets with indistinct ridges, reddish in color, covered with pubescence when young. Leaves alternate, broadly ovate, apex acute, base cordate, shallowly 5-lobed at the tip, size 8-20(25)cm × 10-15cm. Upper surface glabrous, lower surface almost hairless (except for main veins), pale green, turning red in autumn. Petiole length 5-10cm. Flowers in panicles opposite to leaves, often developing tendrils at the base of the peduncle. Inflorescence short, 6-8cm long. Flowers yellowish-green, calyx annular, 5 petals fused at the tip and separating from the calyx at the base, 5 stamens with nectaries between the filaments. Fruit a berry, in clusters hanging downwards, 8-10mm in diameter, black, containing 2-3 seeds.

Sporophyte chromosome number: 38.

Flowering : Mid-May to mid-July

Fruiting: Mid-August to early September

Distribution: Northeastern China (including coastal central China in Zhejiang), central Honshu in Japan; throughout Korea.

Japan Flora: More slender, branches rather thick, smooth, obsoletely angled, pale brown arancous while young; leaves membranous, orbicular- cordate or more or less angled, deeply cordate with a V-shaped sinus at base, 7-15 cm. long and as wide, shallowly deltoid* toothed，thinly arachnoid on upper side while young, dull green and pale lanate beneath, often shallowly 3-lobed, the median lobe slightly larger, deltoid-acuminate to acute, the petioles 5-11 cm. long, at first thinly lanate, later only the spreading bases of the hairs persistent; inflorescence 10-12 cm. long including the short peduncle, 3-5 cm. across, with ten­drils. June.

Honshu (Chugoku Distr.); rare. Korea, Manchuria, and Amur (species).