Vines woody. Branches terete, flat, or ca. 4-grooved, sparsely puberulous, glabrescent; bud scales narrowly ovate to triangular, ca. 6 mm, ciliate. Leaves ternate; petiole 1.5--4 cm; leaflet blades ovate, rhombic, or ovate-lanceolate, 2.5--6 × 1.4--2.6 cm, papery, often 3-lobed, abaxially sparsely pilose only on midvein, adaxially glabrous, base rounded to broadly cuneate, margin to 2-dentate on each side, apex acuminate to narrowly acuminate; basal veins abaxially ± prominent. Flowers 1 or 2 borne together with 2 leaves arising from axillary buds of old branches, ca. 5 cm in diam. Pedicel 5--7.5 cm, puberulous near apex. Sepals 4, yellow, erect, ovate-oblong, 2--3 × 1--1. 7 cm, both surfaces sparsely puberulous, margin abaxially velutinous, apex ± acute. Stamens ca. 1.2 cm; filaments pubescent; anthers narrowly oblong, ca. 3 mm, abaxially densely pubescent on connective, apex with a ca. 0.3 mm apicula. Ovaries puberulous. Style ca. 1 cm, densely villous. Fl. Jun.
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