Vines woody. Branches terete, smooth, glabrous or only sparsely puberulous on nodes. Leaves ternate; petiole 2--5 cm; leaflet blades ovate, elliptic, or narrowly ovate, 5--10 × 2--4 cm, papery, both surfaces glabrous or only midvein sparsely puberulous on one or both surfaces, base rounded to broadly cuneate, margin denticulate, apex caudate-acuminate to acuminate; basal veins abaxially ± prominent. Cymes axillary, 1--3-flowered; peduncle 0.9--1.3 cm, glabrous; bracts lanceolate-linear to narrowly triangular, 2--2.8 mm, glabrous. Flowers ca. 1 cm in diam. Pedicel 2--3.8 cm, glabrous. Sepals 4, white, erect, oblong, 12--15(--18) × 4--5 mm, both surfaces glabrous except for velutinous abaxial margin. Stamens 0.9--1.1 cm; filaments villous; anthers narrowly oblong, 2.2--2.5 mm, glabrous, apex obtuse. Ovaries pubescent. Style ca. 5.5 mm, densely villous. Fl. Oct--Nov.
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