Stems 4--7 m, climbing, branched distally; internodes 5--15 cm. Leaf sheaths ca. 3 cm, puberulent, mouth hirsute-ciliate; petiole extremely short; leaf blade long ovate to lanceolate, 18--23 × 3--4.7 cm, with a line of hirsute hairs along margin, base cuneate to rounded, apex acuminate to caudate-acuminate. Heads with several flowers; bracts ovate-orbicular, ca. 2 mm. Sepals oblong, carinate, 5--15 × ca. 3 mm, glabrous. Petals green, elliptic, ca. 6 × 2.5 mm. Filaments ca. 7 mm; anthers oblong, ca. 2.5 × 1 mm, dehiscent by apical pores. Ovary ca. 1 mm in diam., sparsely puberulent. Style ca. 9 mm. Capsule ovoid-globose, trigonous, 8--11 × ca. 6 mm, glabrous. Seeds 2 per valve, 4--6 mm. Fl. Apr--Jun, fr. Aug--Nov.

Forests; 600--1100 m. S Yunnan [Laos, Thailand, Vietnam].