Vines woody. Branches shallowly 10--12-grooved, glabrous. Leaves ternate, glabrous; petiole 5.5--10 cm; leaflet blades elliptic, oblong, ovate, or broadly ovate, 5--12 × 2.5--6.5(--9.5) cm, subleathery, base broadly cuneate to rounded, margin entire, apex acuminate to obtuse; basal veins flat or adaxially ± prominent. Cymes axillary or terminal, many flowered; peduncle 3--5 cm, glabrous; bracts linear to subulate, 5--6 mm, glabrous or puberulous. Flowers 2.4--4 cm in diam. Pedicel 1--2.8 cm, glabrous. Sepals 4, white or tinged ± pink, spreading, linear-lanceolate to narrowly oblanceolate, 1.2--2.2 × 0.2--0.4 cm, abaxially subglabrous to puberulous, adaxially sparsely appressed puberulous, margin abaxially velutinous, apex attenuate. Stamens 5--12 mm, glabrous; filaments rugose; anthers oblong, 1.2--2.2 mm, apex obtuse. Ovaries pubescent. Style 8--11 mm, densely villous. Achenes ovate to elliptic, 4--6 × ca. 3 mm, pubescent; persistent style 2.4--4 cm, plumose. Fl. Dec--Jan, fr. Feb.
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