Vines woody. Branches shallowly 12-grooved, glabrous, densely minutely white furfuraceous at nodes. Leaves ternate, glabrous; petiole ca. 8 cm, base and apex white furfuraceous; leaflet blades ovate or narrowly so, 10.5--14.5 × 4.8--8 cm, leathery, both surfaces finely retriculate, base subcordate or truncate-rounded, margin entire, apex subacute or acuminate; basal veins distinctly prominent. Cymes axillary, paniclelike, many flowered, glabrous; peduncle ca. 8 cm, base and apex white furfuraceous; bracts narrowly triangular, ca. 4 mm. Flowers 1.5--2 cm in diam.; pedicel 0.8--1.8 cm, glabrous. Sepals 4, white, oblanceolate or narrowly oblong, rarely narrowly obovate, 8--12 × 2.5--3.5(--4.2) mm, both surfaces glabrous, margin velutinous abaxially, apex subobtuse, rarely truncate. Stamens 4.8--6 mm, glabrous; anthers linear, 2.5--3 mm, apex obtuse. Ovaries pubescent; style ca. 5 mm, densely villous. Fl. Apr.
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