Vines woody. Stems to 10 m, pubescent. Leaves ternate; petiole 4--6 cm, pubescent; leaflet blades rhombic to obovate-elliptic, 3--7 × 1--4 cm, papery, unlobed or sometimes indistinctly 3-lobed, both surfaces pubescent, base broadly cuneate, margin 1-or 2-dentate apically from middle, apex acute. Cymes axillary, 1-flowered; peduncle 3--4 cm, pubescent; bracts linear, ca. 7 mm, pubescent. Flowers ca. 6 cm in diam. Pedicel 1--1.5 cm, densely pubescent. Sepals 6, white, spreading, linear-lanceolate, ca. 3 × 0.3 cm, abaxially densely villous, adaxially glabrous, apex acute. Stamens ca. 1.4 cm, glabrous; anthers oblong, ca. 3 mm, apex obtuse. Ovaries pubescent. Style ca. 1.3 cm, densely villous basally, densely pubescent apically. Achenes ovate, ca. 5 × 3.5 mm, pubescent; persistent style 2.5--3 cm, plumose. Fl. May, fr. Sep--Oct.
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