Vines woody. Branches shallowly ca. 8-grooved, sparsely appressed puberulous. Leaves ternate; petiole 4.5--7 cm, subglabrous; leaflet blades oblong-ovate to oblong, 6--12 × 2.6--4.5 cm, papery, both surfaces glabrous, abaxially reticulate, base rounded to broadly cuneate, margin entire, apex acuminate to caudate; basal veins abaxially prominent. Cymes axillary, 1-flowered; peduncle 3--4 mm; bracts linear-triangular, ca. 2 mm. Flowers 1.6--2 cm in diam. Pedicel 1--2 cm, densely puberulous. Sepals 4, greenish white, erect, ovate-oblong, 1.5--1.7 × 0.6--0.8 cm, abaxially very densely yellowish puberulous, adaxially glabrous, apex ± acute. Stamens ca. 1 cm; filaments densely villous; anthers oblong, 2.8--3 mm, glabrous, apex obtuse. Ovaries pubescent. Style ca. 9 mm, densely villous. Fl. Nov--Dec.
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