Vines. Branches deeply grooved, glabrous. Leaves ternate, glabrous; petiole ca. 8 cm; leaflet blades narrowly ovate to triangular-ovate, 9.5--13 × 4.5--6 cm, papery, base broadly cuneate to rounded-truncate, margin dentate at middle part, apex acuminate to attenuate; basal veins abaxially nearly flat. Cymes axillary, 7--14-flowered; peduncle 2--3.6 cm; bracts lanceolate-linear, 1.4--2.2 cm, margin denticulate. Flowers ca. 1 cm in diam. Pedicel 0.6--1.5 cm, sparsely puberulous. Sepals 4, white, erect, oblong-ovate, ca. 9 × 5 mm, abaxially with 3 narrow longitudinal wings and glabrous except for velutinous margin, adaxially puberulous, apex ± acute. Stamens nearly as long as sepals; filaments densely pubescent; anthers oblong, glabrous, apex obtuse. Ovaries pubescent. Style ca. 7 mm, densely villous. Fl. Nov--Dec.
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