Description from Flora of China
Lianas to 2 m. Branches pale gray, glabrous. Petiole ca. 5 mm, puberulent; leaf blade narrowly oblong-lanceolate, 5-9 × 1-1.2 cm, leathery, glabrous except for midvein, base rounded, apex acute; basal veins 3, lateral veins ca. 4 pairs. Inflorescences extra-axillary, lax, up to as long as leaves, rachis usually branched, zigzag; cymules lax, racemelike; peduncle to 6 cm. Pedicel 1-2(-6) mm, pubescent. Sepals oblong, ca. 1.5 × 1 mm, pubescent, ciliate; glands 5. Corolla purple, occasionally pale yellow, rotate; lobes ovate, 2.5-3.5 × 1.4-2 mm, obtuse. Corona lobes ovate, pouched. Anthers nearly square, appendages white, rounded; pollinia globose, horizontal. Ovaries glabrous. Stigma head flat with raised center. Follicles lanceolate in outline, ca. 7 cm × 5 mm, apex acuminate, glabrous. Fl. Mar-May, fr. Jun-Sep.
* Forests, thickets, 300-2400 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang.