Lianas; young branchlets slightly quadrangular, copiously setulose, annually glabrescent; old branches terete, cinereous. Petiole slender, 3-5 mm, slightly grooved on 2 sides; leaf blade elliptic, 4-7 × 2-4 cm, papery, yellow-green when dry, base obtuse or subacute to decurrent, margin sparsely denticulate to crenulate-serrate, apex obtuse or shortly cuspidate; lateral veins 4 or 5 pairs, reticulate veins conspicuous. Cymes solitary or binate, axillary, 1.5-3 cm; inflorescence branches copiously setulose; bracts papery, deltoid-oblong, 0.5-0.8 mm, glabrous; pedicel slender, shorter than 1 mm, obscurely setulose. Flowers yellow-white; sepals membranous, deltoid-oblong, ca. 0.5 mm, margin erosulate; petals papyraceous, elliptic-oblong, ca. 1 mm, entire, glabrous. Disk inconspicuous. Filaments ligulate; anthers nearly globose. Ovary depressed globose; ovules 2 per locule; style less than 1 mm, apex truncate. Fruits 1-3-fascicled capsules; capsule oblong-elliptic, 3.5-4 × 2-2.5 cm, flattened, apex rounded. Seeds 2, black-brown when dry. Fl. Jun-Feb, fr. Sep-Oct.

● Sparse limestone forests; 600-1600 m. SW Guangxi, SE Yunnan.