Description from Flora of China
Lianas or stolon-bearing shrubs when cut, to 5 m tall, densely hispid; latex clear, reddish or white. Petiole 1-5 mm; leaf blade ovate to obovate, 3-22 X 1.5-12 cm, base rounded or subcordate; lateral veins 6-11 pairs. Cymes 3-72-flowered. Sepals ovate, inner ones often linear, 1.3-3.5 cm. Corolla yellow, tube 1-2.2 cm; lobes including tails 15-22.5 cm, proximal part ovate, tail pendulous, puberulent on both sides, to 1 mm wide; corona lobes yellow spotted with red, purple, or brown, tongue-shaped. Anthers included, glabrous. Ovary hispid. Style to 1.2 cm. Follicles very narrowly oblong, to 54 3 cm, densely lenticellate. Seeds narrowly ellipsoid, beak 2.3-7.7 cm, coma to 5 cm. Fl. Feb-Apr, fr. Jun-Dec. 2n = 18.
S Guangdong, S Guangxi, Hainan, S Yunnan [native to WC Africa]