Vines woody. Branches longitudinally grooved, densely puberulous. Leaves 2-pinnate or pinnate; petiole 5--8 cm, densely puberulous; leaflet blades long ovate to ovate-lanceolate, 2--8 × 1--3 cm, papery, unlobed or rarely unequally to 3-lobed, both surfaces densely appressed puberulous, base rounded, margin usually entire or sometimes 2-dentate, apex acute to acuminate. Cymes axillary or terminal, 9--20-flowered; peduncle 5--10 cm, densely appressed puberulous; bracts narrowly ovate, ovate, or elliptic, undivided or 3-lobed. Flowers 2--3.2 cm in diam. Pedicel 1.2--6 cm, densely appressed puberulous. Sepals 4, white, spreading, oblong to elliptic-oblong, 1--2 × 0.4--1 cm, thick, abaxially densely puberulous, adaxially glabrous, apex ± obtuse. Stamens 0.7--1.4 cm, glabrous; anthers oblong, 1.5--2 mm, apex obtuse. Ovaries puberulous. Style ca. 5 mm, densely villous. Fl. Sep--Oct, fr. Nov.
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