Vines woody. Branches terete or inconspicuously 6-angulate, glabrous; bud scales lanceolate to narrowly ovate, 1--2 cm, papery, puberulous. Leaves ternate; petiole 4--7 cm; leaflet blades broadly ovate, ovate, or suborbicular, 5--9 × 3--8.5 cm, papery, 2-or 3-lobed or parted or undivided, both surfaces sparsely appressed puberulous, glabrescent, base subcordate, margin dentate, apex acuminate; basal veins abaxially nearly flat. Flowers solitary, ca. 3.5 cm in diam. Pedicel 5--11 cm, sparsely puberulous to glabrous. Sepals 4, yellowish to reddish, oblong, narrowly elliptic, or ovate, 1.7--2 × 0.5--0.8 cm, abaxially sparsely puberulous, adaxially appressed puberulous, margin abaxially velutinous, apex ± acute. Staminodes linear-spatulate, 1.5--1.8 cm, puberulous. Stamens 1--1.4 cm; filaments pubescent; anthers narrowly oblong, ca. 2.5 mm, abaxially densely pubescent on connective, apex obtuse. Ovaries pubescent. Style ca. 8 mm, densely villous. Achenes narrowly obovate, 4--5 × 2--3 mm, puberulous; persistent style ca. 4.5 cm, plumose. Fl. May--Jun, fr. Jul.
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