Korea Flora: Deciduous vine. Length up to 3m. Winter buds and branchlets conical, with sharp tips, 2 bud scales, 1-3mm long. One-year-old branches 1-4mm in diameter. Leaf scars semicircular. Leaves opposite to tendrils, triangular-ovate, acuminate at apex, cordate at base, 5-8cm × 3-8(10)cm in size. Both surfaces glabrous, but with dense brown hairs on main veins, and sparse teeth on margins. Young plant leaves may be divided like those of Vitis amurensis. Petiole length 4-6cm. Flowers in panicles opposite to leaves, sometimes developing tendrils on peduncles. Inflorescence 7-10cm long. Flowers dioecious, pale yellowish-green, pentamerous. Calyx whorled, petals fused at the top and separating at the base, 5 stamens. Fruit and seeds: 8mm in diameter, black, containing 2-3 seeds.

Flowering : Late May to mid-June

Fruiting : Mid to late October

Distribution: India, Nepal, Thailand, Laos, Vietnam, Philippines, central to southern China, Japan (Hokkaido to Okinawa); South of Hwanghae Province in Korea.
CopyRe

Japan Flora: Branches slen­der, slightly striate, glabrous; lower leaves depressed-deltoid to cordate-deltoid, slightly shorter to as long as wide, acute to acuminate, the upper leaves elongate-deltoid, rather thin, 4-10 cm. long, 4-8 cm. wide, truncate to shallowly open-cordate at base, green, with short deltoid teeth, glabrous on upper side, the under side with the persistent bases of pale brown arach­noid hairs and with axillary tufts of hairs; inflorescence with­out tendrils, 4-7 cm. long, including the peduncles, 2-3 cm. across; fruit globose, bluish black, about 7 mm. across; seeds obovate-orbicular, about 5 mm. long.     May-June. Moun­tains and hills; Honshu, Shikoku, Kyushu; common. Korea, China, and Amami-Oshima.

var. tsukubana Makino. Young branches sparingly arachnoid; leaves glabrous above, thinly brown arachnoid be­neath. Honshu (Kanto and Kinki Distr.); rare.

var. rufotomentosa Makino. Leaves on upper side with only the base of the hairs persistent, arachnoid beneath. Honshu (Kinki Distr., Wakasa Prov.), Shikoku, Kyushu.