Vines woody. Branches sparsely puberulous, glabrescent. Leaves simple or ternate; petiole 3--6 cm; leaf blade or leaflet blades oblong-lanceolate to lanceolate, 4--12 × 2--5 cm, papery, both surfaces glabrous, base subcordate to rounded, margin entire, apex attenuate to acuminate; basal veins flat. Cymes terminal or axillary, ca. 10-flowered; peduncle ca. 7 cm; bracts foliaceous, petiolate, narrowly ovate. Flowers ca. 1.5 cm in diam. Pedicel 1--2.5 cm. Sepals 4, white, spreading, oblong, 8--10 × 5--6 mm, abaxially puberulous, adaxially glabrous, margin abaxially velutinous, apex rounded. Stamens ca. 4.8 mm, glabrous; anthers narrowly oblong, 3--3.2 mm, apex minutely apiculate. Ovaries pubescent. Style ca. 6 mm, densely villous. Achenes fusiform, ca. 5 × 2.5 mm, puberulous; persistent style ca. 2.5 cm, plumose. Fl. Jun.
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