Vines climbing. Stem branched, woody; branches strongly zigzagged, obtusely 4-angled, subsquare in cross section, sometimes sparsely prickly. Petiole 1--1.7 cm, narrowly winged for 1/2--2/3 its length; abscission zone distal; tendrils usually present. Leaf blade oblong to ovate-oblong, 7--11 × 2.5--4.5 cm, thickly papery or thinly leathery, base subtruncate or rounded, apex mucronate. Male inflorescence a raceme of 2--4 umbels, 2.5--4 cm, basally prophyllate; umbels 20--30-flowered, base slightly thickened. Male flowers: tepals 4--5 × ca. 1.5 mm, inner ones ca. 5 × 0.5 mm; stamens 4--5 mm; anthers linear, ca. 1.2 mm. Female flowers and fruit unknown. Fl. Oct.

Forests, shaded places along valleys; 1900--2000 m. ?Xizang, SE and WC Yunnan (Jingdong Xian, Yanshan Xian) [India, Myanmar].