Vines woody. Branches shallowly 6--10-grooved, glabrous. Leaves ternate; petiole 1--1.8 cm, puberulous; terminal leaflet blade broadly rhombic, nearly 3-parted to base, 6--15 × 6--14 mm, leathery or thickly so, both surfaces puberulous, base broadly cuneate, lobes narrowly rhombic, 3-lobulate or 3-dentate; lateral leaflet blades obliquely ovate, unequally 2-parted, slightly smaller than central blade, lobes narrowly rhombic or obovate, margin 1-or 2-denticulate on each side; basal veins nearly flat. Flowers 1--6, borne with 4 leaves from axillary buds of old branches, 2--2.7 cm in diam.; pedicel slender, 2.8--4 cm, densely puberulous. Sepals 4, white, spreading, broadly oblanceolate, obovate-oblong, or oblong, 11--15 × 4--6 mm, abaxially appressed puberulous, adaxially glabrous, apex obtuse or acute. Stamens 4--7 mm, glabrous; filaments linear or narrowly so; anthers narrowly oblong or sublinear, 2--2.2 mm, apex obtuse. Ovaries pubescent; style ca. 5 mm, densely villous, apex circinate. Fl. Jun.
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