Description from Flora of China
Shrubs or climbers 0.5-3 m tall, decumbent. Branchlets angular, hirtellous and glandular granulose, glabrescent, flexuous; pith solid. Petiole canaliculate, 4-6 mm, puberulent; leaf blade elliptic or ovate, 2.5-6(-10) × 1-1.8(-4) cm, papery, base obtuse to rounded, apex acuminate or rarely acute, glabrous to puberulent, base cuneate or obtuse to rounded, margin undulate to sparsely serrulate, apex acuminate to caudate-acuminate, rarely acute; lateral veins ca. 8 on each side of midrib, ending in punctate teeth, submarginal vein absent. Inflorescences axillary, paniculate, 3-7 cm, puberulent; bracteoles minute, lanceolate, hirsute. Flowers white, fragrant, ca. 1.5 mm. Pedicel 1.5-2 mm, puberulent. Calyx lobes broadly ovate, puberulent, orange punctate-lineate, margin entire, ciliate, apex acuminate. Corolla campanulate, ca. 3 × length of calyx lobes; lobes broadly ovate, subequalling tube, crenulate, rounded. Stamens shorter than corolla lobes; anthers broadly ovate or reniform, ca. as long as filaments in staminate flowers. Pistil included. Style short, thick; stigma flattened, somewhat lobed. Fruit unknown. Fl. Feb-Apr.
Mixed forests, shrubby areas, sunny hillsides; 400-1700 m. Guangdong, Guangxi, Hainan, SE Yunnan [N Vietnam]