Lianas, tall. Stem angulate, pubescent at first, soon glabrescent. Leaves 3-foliolate; petiole 6-12 cm, glabrous; leaflets: petiolules 2-3 cm, glabrous; blade ovate to elliptic, 8-13 × 5-8 cm, thickly papery to subleathery, both surfaces glabrous, lateral veins 4-or 5-paired, raised on both surfaces, veinlets conspicuous abaxially, base broadly cuneate and somewhat oblique, apex mucronate. Cymose panicles axillary, lax, 5-18 cm, densely yellow tomentose. Outer tepals oblong, 7-12 mm, both surfaces pubescent. Inner tepals similar to outer ones but smaller, abaxially pubescent. Stamens 5-6 mm; filaments straight in bud, pilose; appendages stipitate, narrowly ovate, ca. 3 mm, membranous, abaxially with open mouth. Ovary densely shortly tomentose; style ca. 7 mm, triquetrous, hirsute. Interstaminal glands small, dentate. Fruit 12-14 cm in diam., 4-winged; large wings ca. 6 cm wide, smaller ones ca. 2 cm wide. Fl. Jul, fr. Sep-Nov.
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