Vines woody. Branches subterete shallowly 8-grooved, puberulous, glabrescent. Leaves ternate; petiole 2.2--3.5 cm, puberulous; leaflet blade rhombic, narrowly so, or ovate, rarely long elliptic, undivided, sometimes 3-lobulate or 3-lobed, 1.5--4.8 × 1--3.5(--4) cm, papery, abaxially strigose, adaxially sparsely pubescent, base broadly cuneate or subrounded, margin few dentate or rarely entire, apex acute or shortly acuminate; basal veins abaxially slightly prominent. Flowers 1 or 2, arising from leaf axils of current year’s branches, 5--5.6 cm in diam.; pedicel 5.8--9.5 cm, appressed puberulous. Sepals 4, white, spreading, narrowly elliptic, obovate-oblong, or narrowly obovate, (2--) 2.6--3 × 1--1.3 cm, abaxially appressed puberulous along 3 basal veins, adaxially glabrous, margin velutinous. Stamens 6--8.5 mm, glabrous; anthers linear, 3.5--3.8 mm, apex obtuse. Ovaries densely puberulous; style ca. 6 mm, densely yellowish villous. Achenes compressed, ovate or broadly so, 2--2.5 × 2--2.2 mm, appressed pubescent; persistent style 9--11 mm, yellowish plumose. Fl. Aug--Sep.
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