Vines woody. Branches glabrous. Leaves ternate; petiole 4--8 cm; leaflet blades elliptic, narrowly obovate-elliptic, or ovate-oblong, 5--8 × 2--4 cm, leathery, abaxially sparsely pubescent only on midvein, adaxially glabrous, base broadly cuneate, margin entire, apex short acuminate; basal veins abaxially prominent. Cymes axillary, 1-flowered; peduncle nearly absent; bracts ovate, ca. 2 mm. Flowers ca. 1.2 cm in diam. Pedicel 2--3 cm, glabrous. Sepals 4, white, tinged purplish red at base, erect, ovate-oblong, ca. 1.5 × 0.5 cm, both surfaces sparsely puberulous to subglabrous, margin abaxially velutinous, apex ± acute. Stamens nearly as long as sepals; filaments densely villous; anthers narrowly oblong, 2--3 mm, glabrous, apex obtuse. Ovaries pubescent. Style ca. 1 cm, densely villous. Fl. Dec.
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