Vines woody. Branches shallowly 4--6-grooved, sparsely spreading puberulous. Leaves ternate; petiole ca. 6 cm, puberulous; leaflet blades ovate to narrowly ovate, 6.5--7.4 × 2.8--4.3 cm, leathery, abaxially sparsely puberulous on midvein, adaxially glabrous, base rounded, margin entire, apex acuminate; basal veins abaxially ± prominent. Cymes axillary, 1-flowered; peduncle 3.5--4.7 cm, spreading puberulous; bracts simple or foliaceous, short petiolate, broadly lanceolate to lanceolate, 1.6--3 cm. Flowers 4.5--5 cm in diam. Pedicel 2.8--3.6 cm, puberulous. Sepals 4, spreading, lanceolate to oblong-lanceolate, 2.2--2.6 × 0.9--1 cm, abaxially densely appressed sericeous, adaxially glabrous, margin abaxially velutinous, apex ± acute. Stamens 0.7--1.3 cm, glabrous; anthers narrowly oblong, 2.5--3 mm, apex obtuse to minutely apiculate. Ovaries pubescent. Style ca. 1 cm, densely villous. Fl. Apr.
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