Description from Flora of China
Lianas to 20 m, glabrous except for corolla tube. Branches dark brown. Petiole 6-10 mm; leaf blade oblong or subovate, 5-9 X 2-3 cm, base obtuse or cuneate, apex acute, adaxially lustrous, abaxially with minute, scattered, peltate, brownish sessile glands; lateral veins ca. 13 pairs, wrinkled. Cymes thyrselike, axillary; peduncle ca. 6 cm. Pedicel ca. 0.5 mm. Sepals ovate to elliptic, ca. 2 mm. Corolla tube ca. 3 mm; lobes narrowly oblong, ca. 4 mm, apex slightly falcate; disc ringlike, 5-lobed. Ovary as long as disc. Style very short; pistil head thick, conical, 5-angled. Follicles paired, linear, 11-12 X ca. 1 cm, base sometimes slightly dilated. Seeds brown, ovate, ca. 2 cm X 5 mm, coma ca. 4 cm. Fl. Apr-May, fr. Jun-Dec.
* Dense montane forests; 300-800 m. Guangxi, Hainan, Sichuan.