Vines woody, sometimes suberect. Branches shallowly 8-grooved, glabrescent. Leaves ternate; petiole 1--6.5 cm; leaflet blades rhombic-obovate to rhombic-ovate, 2--6 × 1.5--4.5 cm, papery, abaxially densely appressed yellowish pubescent, adaxially ± densely appressed pubescent, base broadly cuneate, margin few dentate, apex acute to acuminate; basal veins nearly flat. Flowers 1--6 borne together with several leaves from axillary buds of old branches or solitary in leaf axils of current year’s branches, 3.2--6 cm in diam. Pedicel 4.5--8.5(--20) cm, densely puberulous. Sepals 4, white or pink, spreading, obovate to elliptic-obovate, 1.6--3 × 0.8--2 cm, abaxially appressed puberulous, adaxially glabrous, margin abaxially velutinous, apex obtuse, rounded, or rarely acute. Stamens 6--11 mm, glabrous; anthers narrowly oblong, 3--4 mm, apex obtuse. Ovaries pubescent. Style ca. 7 mm, densely villous. Achenes ovate, 4--5 × 2--3 mm, pubescent; persistent style 2.2--2.7 cm, brownish plumose. Fl. Apr--Jul, fr. Jul--Oct.
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