Vines woody. Branches very shallowly 4-grooved, glabrous or only sparsely puberulous on nodes; branchlets densely puberulous. Leaves pinnate, 5-foliolate; petiole 3.6--5 cm, puberulous; leaflet blades broadly ovate to broadly rhombic, ca. 3.8 × 3.8 cm, papery, 3-lobed, abaxially pubescent on veins, adaxially sparsely puberulous on slightly impressed veins, base subtruncate to broadly cuneate; basal veins nearly flat; central lobe subrhombic, margin 1-dentate on each side; lateral lobes oblique cuneate, unequally 2-lobed. Cyme arising from leaf axils of current year’s branches, 1-flowered; peduncle 2.5--6 cm, puberulous; bracts narrowly lanceolate, 2--4 mm, puberulous. Flowers ca. 3 cm in diam. Pedicel 0.6--1.5 cm, puberulous. Sepals 4, yellowish white, spreading, broadly obovate, orbicular-rhombic, or broadly elliptic, 1.2--1.8 × 1--1.5 cm, abaxially puberulous, adaxially glabrous. Stamens 8--10 mm, glabrous; anthers narrowly oblong, 1.8--2 mm, apex obtuse. Ovaries pubescent. Style ca. 8 mm, densely villous. Fl. Apr.*
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