Vines woody. Branches, petioles, peduncles, and pedicels densely pubescent. Branches shallowly 8--10-grooved. Leaves ternate; petiole 6--8 cm; leaflet blades ovate, elliptic, or suborbicular, 5--10 × 3--6 cm, papery, abaxially densely pubescent, adaxially sparsely appressed pubescent, base rounded to cordate, margin dentate to denticulate, apex acute; basal veins abaxially prominent. Cymes axillary, 6-to many flowered, often paniclelike; peduncle 2--4.5 cm; bracts short petiolate, foliaceous. Flowers ca. 1.5 cm in diam. Pedicel 1.5--2.2 cm. Sepals 4, yellowish white, erect, narrowly oblong, 12--15 × 4--7 mm, abaxially ± densely appressed pubescent, adaxially appressed puberulous only near apex, margin abaxially velutinous, apex ± acute and recurved. Stamens ca. 1.2 cm; filaments basally pubescent, apically villous; anthers narrowly oblong, 2.8--3 mm, abaxially sparsely puberulous on connective, apex obtuse. Ovaries puberulous. Style ca. 1 cm, densely villous. Fl. Nov--Jan, fr. Feb--Mar.
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