Vines woody. Stems to 8 m; branches indistinctly 8-angulate, sparsely puberulous near nodes, elsewhere glabrous. Leaves ternate; petiole 6--6.8 cm, adaxially sparsely puberulous; leaflet blades oblong-elliptic, 8.5(--11) × 3(--5.8) cm, papery, both surfaces sparsely puberulous on basal veins, base obtuse or rounded, margin minutely 3--5-denticulate on each side, apex attenuate or acuminate; basal veins abaxially slightly prominent. Cymes axillary, ca. 5-flowered; peduncle robust, 1--9 cm × ca. 2 mm, usually densely appressed puberulous; bracts triangular, ca. 3 mm, densely puberulous. Flowers 1.5--2 cm in diam.; pedicel robust, 8--18 mm × ca. 2 mm, yellowish velutinous, apex thickened. Sepals 4, white, erect, oblong or ovate-oblong, 17--19 × 7--8 mm, abaxially densely appressed puberulous, adaxially glabrous, margin velutinous, apex acute. Stamens ca. 15 mm; filaments narrowly linear, slightly dilated above base, villous; anthers narrowly oblong, 3--3.6 mm, glabrous, apex obtuse. Ovaries densely puberulous; style ca. 11 mm, densely villous. Achenes compressed, narrowly ovate or long elliptic, 3--4 × 1.2--1.5 mm, puberulous, indistinctly narrowly marginate, apex attenuate; persistent style 2.5--3.9 cm, plumose. Fl. Mar--Apr, fr. Apr.
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