Large, woody lianas. Branchlets unarmed, purple-brown when dry, with several striate lines, sparsely stellate puberulent when young. Petiole 4-13 cm; leaf blade broadly ovate or elliptic-ovate, 15-22 × 9-16 cm, nearly glabrous or sparsely stellate on veins only, basal veins 5, veinlets parallel, base cordate or shallowly cordate, apex long acuminate or acute. Inflorescences umbel-like, slightly hairy. Pedicels slender, 4-7 cm, articulate near middle. Flowers 8-10 mm wide. Sepals lanceolate, 4-5 mm, connate basally, very sparsely pilose. Petals ca. 2 × 2-2.5 mm, with narrowly lanceolate ca. 3 mm appendix, adnate to staminal tube at base. Ovary very small, hairy. Capsule globose, 1.5-2 cm in diam., black when dry, with hard and pointed spines, spines 4-5 mm. Seeds gray-brown with dark brown mottling, oblong, ca. 5 mm.

Open forests; 800-1600 m. S Yunnan (Xishuangbanna) [Myanmar, Thailand].