Vines suffruticose. Branches slender, shallowly ca. 8-grooved, glabrous. Leaves pinnate, 7-foliolate, glabrous; petiole slender, ca. 2.7 cm; leaflet blades ovate, 2.5--5 × 0.5--2.5 cm, papery, base rounded, margin entire, apex ± acute; basal veins inconspicuous. Cymes axillary, l(--3)-flowered; peduncle 1.5--2.2 cm; bracts short petiolate, elliptic, 0.1--2.6 cm. Flowers ca. 2.5 cm in diam. Pedicel slender, 2.5--4.5 cm, glabrous. Sepals 4, yellow, erect, ovate-oblong, ca. 2.5 × 0.8 cm, abaxially glabrous except for velutinous margin, adaxially puberulous, apex acute. Stamens ca. 1.3 cm; filaments densely villous; anthers linear, 3.8--4.5 mm, glabrous, apex obtuse or minutely apiculate. Ovaries pubescent. Style ca. 1 cm, densely villous.
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