Vines woody. Stems 2--10 m; branches shallowly longitudinally 7-or 8-grooved, densely puberulous. Leaves pinnate, (3--)5-foliolate; petiole 2.5--6 cm, densely puberulous; leaflet blades ovate, broadly ovate, or elliptic, 4--8 × 1.5--6.5 cm, papery, undivided or rarely 3-lobed, abaxially densely puberulous, adaxially strigose, base rounded to subcordate, margin usually 1--4-dentate or rarely entire, apex acuminate to acute; basal veins abaxially prominent. Cymes axillary or terminal, (3--)10--85-flowered; peduncle 2.2--8.5 cm; bracts short petiolate, ovate to elliptic, 0.5--6 cm. Flowers 1.3--1.8 cm in diam. Pedicel 0.5--1.7 cm, densely puberulous. Sepals 4, white, spreading, elliptic-oblong, oblong, or obovate-oblong, 7--9.5 × 2--4.5 mm, abaxially densely velutinous, adaxially glabrous, margin abaxially velutinous, apex obtuse. Stamens 3--6 mm, glabrous; anthers narrowly oblong, 1.2--2 mm, apex rounded to obtuse. Ovaries puberulous. Style ca. 4 mm, densely villous. Fl. Jul--Sep, fr. Oct--Dec.
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