Vines woody. Branches shallowly 4--8-grooved, glabrous. Leaves 1-or 2-pinnate; petiole 3--5.5 cm; leaflet blades ovate to broadly ovate, 1.8--5 × 1.8--4 cm, papery, 2-or 3-lobed or parted, abaxially sparsely puberulous on basal veins and slightly glaucous, adaxially glabrous, base subcordate, rounded, or broadly cuneate, margin irregularly dentate; basal veins abaxially ± prominent; larger lobes ovate-oblong or with a lanceolate terminal lobe. Cymes axillary, 1--3-flowered; peduncle 4--9.5 cm, glabrous; bracts short petiolate, ternate. Flowers 1.4--2 cm in diam. Pedicel 1.5--4 cm, glabrous. Sepals 4, yellow, ascending, papery, ovate, 9--17 × 5--8 mm, abaxially glabrous except for velutinous margin, adaxially appressed puberulous, apex acute. Stamens 3.5--10 mm; filaments puberulous; anthers narrowly oblong, 1.4--3 mm, glabrous, apex obtuse. Ovaries pubescent. Style 7--10 mm, densely villous. Fl. Jun--Jul.
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