Lianas to 5 m, glabrescent except for flowers. Branchlets slightly lenticellate. Petiole 1.5-2 cm; leaf blade elliptic, 9-10 × 4-4.5 cm, papery, drying brownish, both ends acute; lateral veins 5 or 6 pairs, arcuate ascending. Cymes dichotomous, lax, slightly shorter than leaves, rusty tomentose to glabrous. Sepals ovate, ca. 2 × 1 mm. Corolla membranous, glabrous outside; tube ca. 4 × 3 mm, villous inside; lobes ligulate-falcate, ca. 5 × 1 mm. Corona lobes ovate, shorter than anthers, apex acuminate. Pollinia obovate. Stigma head long beaked. Fl. May.

* Mixed woods. Hainan