Vines woody. Branches shallowly ca. 10-grooved, glabrous. Leaves ternate, glabrous; petiole 4--13 cm; leaflet blades ovate, broadly ovate, or lanceolate, 5--11 × 3.8--8 cm, papery, base subcordate, broadly cuneate, or rounded, margin entire, apex obtuse; basal veins abaxially ± prominent. Cymes axillary, usually sparsely 7--12-flowered; peduncle 0.5--5 cm, sparsely glabrous; bracts linear to subulate, 4--6 mm. Flowers 2--4 cm in diam. Pedicel 3--8 cm, densely puberulous. Sepals 4, white, spreading, narrowly ovate to ovate-lanceolate, 1--2 × 0.4--0.8 cm, abaxially densely appressed puberulous to velutinous, adaxially glabrous, apex ± acute. Outer stamens abortive, becoming staminodes, narrowly linear, 1--1.5 cm, glabrous; inner stamens fertile, 5--8 mm, glabrous; anthers narrowly oblong, 2--2.8 mm, apex with a lanceolate-linear 1.5--3 mm apicula. Ovaries pubescent. Style ca. 6.5 mm, densely villous. Achenes narrowly ovate to subfusiform, 6--10 × 1--2 mm, pubescent; persistent style 3--5 cm, plumose. Fl. Nov--Dec, fr. Jan--Feb.
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