Vines woody. Stems 1.8--3.5 m; branches longitudinally 5-or 6-grooved, densely appressed puberulous. Leaves pinnate, (3--)5-foliolate; petiole 2.5--7 cm, puberulous; leaflet blades ovate, broadly ovate, or elliptic, 3.5--8(--10) × 1.8--4.8(--8) cm, papery, undivided or 3-lobed, abaxially densely puberulous or sometimes velutinous to sparsely puberulous, adaxially sparsely appressed puberulous, base rounded, broadly cuneate, truncate, or subcordate, margin sparsely coarsely dentate, apex acuminate to acute; basal veins nearly flat or ± prominent. Cymes axillary or terminal, 3--20-flowered, axillary ones often 3--6-flowered; peduncle 2--6 cm; bracts sometimes foliaceous, linear to narrowly lanceolate, 5--11 mm. Flowers 1.6--3 cm in diam. Pedicel 1.2--3 cm, densely puberulous. Sepals 4 or 5, white, spreading, obovate-oblong, 10--15 × 2.5--5 mm, abaxially densely appressed puberulous, adaxially glabrous or sparsely appressed puberulous, margin abaxially velutinous, apex obtuse. Stamens 7--10 mm, glabrous; anthers narrowly oblong, 1.2--2 mm, apex obtuse. Ovaries pubescent or glabrous. Style ca. 7 mm, densely villous. Achenes broadly ovate to broadly elliptic, 2.2--3 × 2--2.5 mm, ± pubescent or glabrous; persistent style 2--3.4 cm, plumose. Fl. May--Aug, fr. Jul--Aug.
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