Vines woody. Branches shallowly ca. 6-grooved, puberulous. Leaves ternate; petiole 3--5 cm; leaflet blades broadly ovate to ovate-elliptic, 2.5--5.4 × 1--2.8 cm, thin papery, both surfaces sparsely appressed puberulous, abaxially slightly glaucous, base rounded to broadly cuneate, margin to 2-dentate on each side or entire, apex acuminate; basal veins abaxially flat. Flowers axillary, solitary, 2--3 cm in diam., nodding. Pedicel 4--7.5 cm, appressed puberulous. Sepals 4, erect, oblong, ca. 2.5 × 0.9 cm, abaxially glabrous except for velutinous margin, adaxially densely puberulous, apex acuminate. Stamens ca. 1.3 cm; filaments puberulous; anthers narrowly oblong, 2.8--3 mm, abaxially densely yellowish puberulous on connective, apex with a ca. 0.2 mm apicula. Ovaries pubescent. Style ca. 7 mm, densely villous. Fl. Jul.
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