Vines woody. Branches shallowly longitudinally 10-grooved, puberulous. Leaves pinnate, 5-foliolate; petiole 3--6 cm; leaflet blades ovate to broadly ovate, 2.5--7 × 1.5--5.5 cm, papery, abaxially densely curled puberulous, adaxially sparsely puberulous on veins to subglabrous, base subcordate, cordate, truncate, or rounded, margin entire, apex acute, acuminate, or obtuse; basal veins abaxially ± prominent. Cymes axillary or terminal, 3(--7)-flowered; peduncle 3.5--12 cm; bracts petiolate, simple, ovate to narrowly ovate, 1--4.5 cm, or foliaceous. Flowers 2.5--4.6 cm in diam. Pedicel 1--3.2 cm, densely puberulous. Sepals 4(--6), white, spreading, obovate-oblong to narrowly oblong, 1.3--2(--2.4) × 0.4--0.7 cm, abaxially puberulous, adaxially glabrous, margin abaxially velutinous, apex obtuse to ± obtuse. Stamens 8--11 mm, glabrous; anthers narrowly oblong, 3.2--4.5 mm, apex minutely apiculate. Ovaries pubescent. Style 5--8 mm, densely yellowish villous. Achenes elliptic, 6--8 × 3.5--5 mm, pubescent; persistent style 2.5--4.5 cm, brownish yellow plumose. Fl. May--Jun, fr. Aug--Sep.
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