Lianas; branchlets brown-gray, slightly tetragonous, glabrous, sometimes densely scabrous lenticellate. Petiole 5-8 mm, robust; leaf blade oblong-elliptic, 5-10(-18) × 3-6 cm, leathery, base obtuse or narrowly rounded, margin sparsely denticulate to crenulate-serrate, apex abruptly cuspidate, cusp 5-10 mm; lateral veins 4-6 pairs, reticulate veins conspicuous. Cymes axillary or terminal, 2.5-6 cm; branchlet and peduncle slender, densely farinose, puberulent; peduncle 1.5-3 cm; bracts and bractlets deltoid, entire, farinose, puberulent; pedicel slender, 3-8 mm. Flowers light green; sepals ovate-deltoid, less than 1.5 mm, margin ciliolate, apex obtuse, abaxially farinose, puberulent; petals oblong-lanceolate, 4-5 × 1.7-2.5 mm, abaxially farinose, puberulent. Disk fleshy, cupular, 1-1.5 mm tall, base subpentagonous, 2-3 mm in diam. Style conic-subulate, 1-1.5 mm, apex truncate. Fruits 1-3-fascicled capsules, peduncle not dilated; capsule elliptic or obovate-elliptic, 4.4-6 × 2.5-3.2 cm, base obtuse, apex rounded or emarginate, 3- or 4-seeded. Seeds broadly elliptic, basally winged, wing membranous. Fl. May-Jun, fr. Jul-Sep.

● Valley forests; 300-700 m. SW Guangxi, Hainan, S Yunnan.