Vines woody. Branches shallowly 8-grooved, puberulous. Leaves ternate, rarely simple; petiole 0.8--6.8 cm, densely puberulous; leaf blades thick papery, abaxially ± densely puberulous, adaxially sparsely puberulous only on veins, both surfaces conspicuously reticulate; basal veins abaxially prominent; leaflet blades of ternate leaves elliptic to elliptic-ovate, (3--)6--10.8 × (1.7--)3.5--7.2 cm, base rounded, subcordate, or broadly cuneate, margin entire or sparsely denticulate, apex acuminate; leaf blade of simple leaves cordate-ovate, 10.5--12.5 × 7.8--8.8 cm, base cordate, margin entire, apex short acuminate. Cymes axillary, (3--)6--25-flowered; peduncle 1--8.2 cm, densely puberulous; bracts narrowly ovate to elliptic and 1.1--3.3 cm or linear to subulate and 2.5--8 mm. Flowers ca. 1 cm in diam. Pedicel 0.5--2.5 cm, densely puberulous. Sepals 4, white, erect, lanceolate-oblong, 10--18 × 2--5 mm, abaxially densely appressed puberulous, adaxially sparsely puberulous near apex, margin abaxially velutinous, apex acute. Stamens as long as sepals; filaments densely villous; anthers narrowly oblong, 3.8--4 mm, glabrous, apex obtuse. Ovaries puberulous. Style ca. 9 mm, densely villous. Fl. Jan--Jun, fr. Feb.
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