Vines woody. Branches shallowly 8-grooved, glabrous. Leaves ternate, glabrous; petiole 3--8 cm; leaflet blades oblong-ovate to ovate, 7--10 × 3.5--9 cm, leathery, base truncate to rounded, margin entire or remote crenulate, apex acute to acuminate; basal veins abaxially prominent. Cymes axillary, 3--10-flowered; peduncle 1.5--2.5 cm, densely rusty puberulous or glabrous; bracts subulate, ca. 1.5 mm. Flowers ca. 6 cm in diam. Pedicel 4--10 cm, densely rusty puberulous or glabrous. Sepals 4 or 6, purple, spreading, oblong-ovate, ca. 3 × 1.5 cm, abaxially puberulous, adaxially glabrous, margin abaxially velutinous, apex ± obtuse. Stamens 1.2--1.3 cm, glabrous; anthers linear, ca. 7 mm, apex with a 1--5 mm apicula. Ovaries pubescent. Style ca. 1 cm, densely villous. Achenes narrowly rhombic, ca. 6 × 3 mm, pubescent; persistent style ca. 5 cm, plumose. Fl. May, fr. Jul.
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