Vines woody. Branches longitudinally 6-or 7-grooved, sparsely puberulous. Leaves ternate or simple; petiole 1.2--4 cm, sparsely puberulous; leaflet blades or leaf blade ovate to broadly ovate, 2--8 × 1--5 cm, papery, abaxially sparsely appressed puberulous, adaxially minutely puberulous only on basal veins, base subcordate, truncate, or rounded, margin sparsely minutely denticulate or entire, apex acuminate; basal veins nearly flat. Cymes axillary or terminal, 3--7-flowered; peduncle 3.5--6 cm, sparsely puberulous; bracts petiolate, ovate, 0.7--2 cm. Flowers ca. 2 cm in diam. Pedicel 0.6--1.8 cm, appressed puberulous. Sepals 4, white, spreading, obovate-oblong, 10--12 × 3--4 mm, abaxially appressed puberulous, adaxially glabrous, margin abaxially velutinous, apex acute. Stamens 6--7 mm, glabrous; anthers oblong, ca. 1 mm, apex obtuse. Ovaries pubescent. Style ca. 6 mm, densely brownish pubescent from base to middle, subappressed brownish shortly hairy at middle, glabrous apically. Achenes narrowly ovate, 8--9 × 3.8--4.2 mm, appressed puberulous; persistent style ca. 6 mm, basally pubescent, middle puberulous, apically glabrous. Fl. Jun--Jul, fr. Oct.
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