Vines woody. Branches shallowly 4--6-grooved, appressed puberulous, often glabrescent. Leaves pinnate and 5-foliolate, or ternate; petiole 3--11 cm; leaflet blades ovate to broadly ovate, (2.5--)5--12 × (1.5--)3--7.5 cm, papery, 2-or 3-lobed or undivided, abaxially sparsely puberulous on veins and often laxly reticulate, adaxially sparsely appressed puberulous, base rounded to subcordate, margin dentate, apex acuminate; basal veins prominent. Cymes axillary or terminal, (5-to) many flowered, often paniclelike; peduncle 3--8 cm, puberulous; bracts triangular to elliptic, 3--10 mm, sometimes ternate and ca. 3 cm. Flowers 1.5--2 cm in diam. Pedicel 0.5--1.8(--3) cm, densely puberulous. Sepals 4, white, ascending, narrowly obovate-oblong, 12--19 × 3--5 mm, abaxially densely appressed puberulous, adaxially glabrous, margin abaxially velutinous, apex ± acute to obtuse. Stamens 7--9 mm; filaments glabrous or apically pilose; anthers linear, 2.5--3 mm, glabrous, apex minutely apiculate. Ovaries puberulous. Style 5 mm, densely villous. Fl. Jun--Aug.
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