Description from Flora of China
Marsdenia cambodiensis Costantin.
Vines suffrutescent, to 2 m, stems, petioles, and inflorescences thin pubescent, glabrescent. Petiole 0.6-1.7 cm; leaf blade ovate to oblong, 2.5-9 × 2-4 cm, base rounded or subcordate, apex acute or obtuse, abaxially pale or glaucous. Inflorescences umbel-like, branched, compact, much shorter than leaves; peduncle 1-1.5 cm. Pedicel 1.5-2 mm, ciliolate. Sepals ovate, ca. 2 mm. Corolla campanulate, 3.5-4 mm; tube longer than lobes, throat with a very dense tuft of woolly hairs, conspicuous in dried material, reflexed hairy in tube; lobes oblong, glabrous except at base. Corona lobes ovate-lanceolate, shorter than anthers. Pollinia oblong or reniform. Stigma head short conical. Follicles ellipsoid, thick walled, 4.5-5.5 × 1.5-2 cm. Seeds ca. 0.9-1.3 cm × 6-8 mm; coma 2-2.5 cm. Fl. May.
Thickets. Hong Kong [Cambodia, Laos, Thailand].