Vines woody. Branches shallowly 10-grooved, glabrous. Leaves pinnate, 5-foliolate, glabrous; petiole 4--8 cm; leaflet blades narrowly ovate to narrowly elliptic, 3--7.8 × 1.4--3.2 cm, papery, base broadly cuneate to rarely rounded, margin entire, apex acuminate to acute; basal veins flat. Cymes axillary or terminal, sparsely 5--9-flowered; peduncle ca. 10 cm, glabrous; bracts pinnate or simple. Flowers ca. 6 cm in diam. Pedicel 6.5--9 cm, glabrous. Sepals 4, yellow, spreading, lanceolate-oblong, 2.7--3.5 × 0.8--1 cm, abaxially densely yellowish velutinous, adaxially glabrous, apex ± acute. Stamens 1.1--2 cm, glabrous; anthers narrowly oblong, 1.6--2 mm, apex with a distinct, narrowly linear apicula 2.2--2.8 mm. Ovaries pubescent apically. Style 0.7--1.4 cm, densely villous. Fl. Sep.
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