Vines woody. Branches shallowly 8-grooved, sparsely puberulous or glabrous. Leaves ternate or pinnate, 5-foliolate; petiole 3--7 cm; leaflet blades ovate, narrowly ovate, or oblong, 3--10 × 2--5 cm, papery, both surfaces sparsely puberulous on veins, base rounded to rounded-truncate, margin entire or sometimes sparsely 1--3-denticulate, apex acuminate; basal veins nearly flat. Cymes (1--)3-flowered; peduncle 1.8--5.5 cm, glabrous; bracts lanceolate, 3--7 mm. Flowers 2--3.4 cm in diam. Pedicel 2--5 cm, sparsely puberulous only near apex. Sepals 4, yellowish white, spreading, oblong to obovate-oblong, 10--16 × 4--6 mm, abaxially sparsely puberulous near apex, adaxially densely puberulous, margin abaxially velutinous, apex obtuse. Stamens 7--12 mm, glabrous; anthers oblong to narrowly oblong, 2--2.6 mm, apex obtuse. Ovaries pubescent. Style 7--9 mm, densely villous. Fl. Mar--Apr, fr. May.
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