Vines woody. Branches shallowly 8-grooved, glabrous. Leaves pinnate, 5-foliolate, or ternate, glabrous; petiole 2--5 cm; leaflet blades elliptic, ovate, or triangular-ovate, 2--5 × 1--3 cm, papery, base subcordate to rounded, margin entire, apex obtuse; basal veins flat on both surfaces. Flowers 2--7 borne together with several leaves from axillary buds of old branches, 3.6--4 cm in diam. Pedicel 6.5--7.5 cm, densely pubescent. Sepals 6, white, spreading, oblong-obovate, 1.8--2 × 0.8--1 cm, abaxially densely appressed puberulous, adaxially glabrous, apex rounded and often emarginate. Stamens ca. 1 cm, glabrous; anthers narrowly oblong to linear, 2--2.6 mm, apex obtuse. Ovaries pubescent. Style ca. 6 mm, densely villous. Fl. Mar.
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