Vines perennial, herbaceous. Branches shallowly 4--6-grooved, densely puberulous. Leaves ternate; petiole 2.8--6.2 cm; leaflet blades lanceolate to narrowly ovate, rarely ovate, 3.2--6.3(--7.4) × (0.8--)1.1--2.3(--3.4) cm, papery, undivided or 3-lobed, abaxially sparsely puberulous, adaxially glabrous or subglabrous, base broadly cuneate, margin entire, apex attenuate to acuminate and mucronate; basal veins abaxially ± prominent. Cymes axillary or terminal, 3--5-flowered; peduncle 0.5--3 cm, densely puberulous; bracts petiolate, narrowly ovate to lanceolate. Flowers 1.5--2.5 cm in diam. Pedicel 0.5--3.4 cm, densely puberulous. Sepals 4, white, spreading, narrowly oblong, 8--13 × 3--4 mm, abaxially densely appressed puberulous, adaxially glabrous, apex acute-mucronate. Stamens 2--9 mm, glabrous; anthers oblong, 0.8--1 mm, apex obtuse. Ovaries pubescent. Style 6--7 mm, densely villous. Achenes ovate to elliptic, 3--5 × ca. 2.5 mm, pubescent; persistent style 1.5--4 cm, yellowish plumose. Fl. Nov--Jan, fr. Jan--Feb.
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