Vines herbaceous. Branches ca. 4-grooved, appressed puberulous. Leaves ternate; petiole 5.5--6.4 cm; leaflet blades oblong-lanceolate, narrowly ovate, or narrowly elliptic, 2.7--8 × 1--2.8 cm, leathery, abaxially sparsely short strigose, adaxially sparsely strigose, base broadly cuneate, margin 1-denticulate on each side but entire apically from middle, apex acute; basal veins abaxially ± prominent. Cymes axillary, 1--3-flowered; peduncle 2.5--13 mm, densely puberulous; bracts narrowly elliptic, 0.6--2 cm. Flowers ca. 1.8 cm in diam. Pedicel 2.5--7 cm, densely puberulous. Sepals 4, pinkish, erect, suboblong, ca. 1.8 × 0.4 cm, abaxially with 3 narrow longitudinal wings and appressed puberulous, adaxially only apex puberulous, margin abaxially velutinous, apex ± obtuse. Stamens ca. 7.5 mm; filaments densely villous; anthers narrowly oblong, 1.8--2 mm, glabrous, apex obtuse. Ovaries pubescent. Style ca. 7 mm, densely villous. Fl. Sep--Oct, fr. Oct--Nov.
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