Vines perennial, herbaceous. Stems shallowly 5-or 6-grooved, appressed puberulous to subglabrous, branched. Leaves pinnate, sometimes ternate; petiole 1.7--3 cm; leaflet blades ovate, ovate-elliptic, or elliptic-lanceolate, 1--5 × 0.2--3 cm, thin papery to herbaceous, 2-or 3-lobed or undivided, abaxially densely appressed puberulous, adaxially sparsely puberulous on veins, base broadly cuneate, rounded, or subcordate, margin entire, apex obtuse, ± acute, or rounded; basal veins abaxially nearly flat and inconspicuous. Cymes axillary, 1--3-flowered; peduncle 2--6.5 cm; bracts ovate to broadly ovate, 2--3 cm, undivided or 3-lobed. Flowers 2--3 cm in diam. Pedicel 1.2--3 cm, puberulous. Sepals 4, white, ascending, oblong to oblong-lanceolate, 1.4--2.2 × 0.3--0.6 cm, ± widened near apex, abaxially densely appressed puberulous, adaxially glabrous, apex obtuse and reflexed. Stamens 4.5--5.5 mm, glabrous; anthers linear to narrowly oblong, 2.5--3.2 mm, apex with a 0.3--0.5 mm apicula. Ovaries puberulous. Style 6--7 mm, densely appressed pubescent. Achenes broadly elliptic to broadly ovate, 4--6 × 4--5.5 mm, appressed puberulous; persistent style subulate, 0.8--1.3 cm, appressed yellowish pubescent. Fl. Jun--Aug, fr. Oct.
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