Vines woody, turning black on drying. Stems to 2.5 m; branches longitudinally 4-or 5-grooved, densely puberulous and mixed with hairs. Leaves pinnate, (3--)5-foliolate; petiole 2--5.5 cm, densely pubescent; leaflet blades broadly ovate to deltoid-ovate, 1.8--7 × 1.1--7.8 cm, papery, 3-lobed or parted, abaxially densely puberulous but velutinous on veins, adaxially densely appressed pubescent, base subcordate, cordate, or rounded-truncate, margin sparsely unequally dentate, apex acute to acuminate; basal veins abaxially nearly flat. Cymes axillary or terminal, (1--)3--14-flowered; peduncle 3--9 cm; bracts short petiolate, elliptic to broadly ovate, 0.7--2 cm. Flowers 1.3--1.7 cm in diam. Pedicel 0.8--2.4 cm, puberulous. Sepals 4, white, spreading, obovate-oblong, 7--9.5 × 2.8--5 mm, abaxially densely puberulous to velutinous, adaxially glabrous, margin abaxially velutinous, apex obtuse. Stamens 6--8.5 mm, glabrous; anthers narrowly oblong, 1--1.2 mm, apex rounded. Ovaries pubescent. Style ca. 5 mm, densely villous. Achenes ovate, ca. 4 × 2 mm, puberulous; persistent style 2.3--4.5 cm, plumose. Fl. Aug--Oct, fr. Oct--Nov.
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