Description from Flora of China
Bidaria yunnanensis (Tsiang) P. T. Li.
Lianas to 7 m, minutely tomentose throughout. Petiole 1-1.5 cm; leaf blade ovate to ovate-elliptic, rarely obovate, 6-13 × 2.5-6 cm, glabrescent except for veins, base rounded, apex acuminate; lateral veins 5 or 6 pairs. Sepals ovate-oblong, as long as corolla tube, hirsute. Corolla yellowish green to white-green; lobes ovate, ciliate; appendages exserted from corolla tube, hair bands well developed. Anther appendages retuse, shorter than stigma head; pollinia oblong, erect. Stigma head globose, exserted. Follicles ovoid-lanceolate in outline, conspicuously beaked with asymmetrically swollen base, 6-6.5 × 2-3 cm, densely minutely tomentose. Seeds ovate-oblong, 1.3-1.5 cm × 6 mm, margin membranous; coma ca. 2.5 cm. Fl. Mar-Jun, fr. Jun-Dec.
* Mixed woods; 1000-2000 m. SW Guangxi, S Yunnan.