Vines woody. Branches 4-grooved, glabrous. Leaves pinnate, 5-foliolate; petiole 2.2--4.5 cm, sparsely puberulous; leaflet blades triangular, 0.8--2 × 0.4--1.6 cm, thick papery to leathery, unequally 2-lobed, 3-parted, or 3-sect, abaxially sparsely appressed puberulous, adaxially glabrous, base cordate-truncate to subcordate, margin 1-or 2-denticulate on each side or rarely entire; basal veins nearly flat and inconspicuous; terminal lobe largest, narrowly rhombic-lanceolate to linear-lanceolate, 1--6 mm wide; lateral lobes smaller and obliquely cuneate. Flowers solitary, terminal, 3.5--6 cm in diam. Pedicel 9--21.5 cm, glabrous or very sparsely puberulous. Sepals 4, yellow, ascending, oblong-lanceolate, 2.3--4.2 × 0.8--1.1 cm, abaxially glabrous except for velutinous margin, adaxially densely appressed puberulous, apex attenuate into a 3--6 mm tail-like projection. Stamens 0.8--1.2 cm; filaments pilose near margin; anthers oblong to narrowly oblong, 2.4--3 mm, glabrous, apex obtuse. Ovaries pubescent. Style 1.1--1.3 cm, densely villous. Fl. Jun--Jul.
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