Vines woody. Branches shallowly 8--20-grooved, glabrous. Leaves simple; petiole 3.5--6 cm; leaf blade ovate to deltoid-ovate, 8--16.5 × 6.5--11 cm, leathery, both surfaces glabrous, obscurely reticulate, base cordate to subcordate and sometimes slightly to conspicuously peltate, margin entire, apex ± obtuse to acute; basal veins 5--7, abaxially ± prominent. Cymes paniclelike, axillary, laxly flowered; peduncle 1--11 cm, sparsely puberulous; bracts small, linear. Flowers 3--3.6 cm in diam. Pedicel 4--7 cm, densely puberulous. Sepals 4 or 5, blue-purple, lanceolate-oblong, 1.6--1.8 × 0.5--0.7 cm, abaxially reddish brown velutinous, adaxially glabrous, margin often revolute, apex ± obtuse. Stamens 0.8--1.4 cm, glabrous; anthers narrowly oblong, 2.5--3 mm, apex with a conspicuous 1--2 mm apicula. Ovaries pubescent. Style ca. 6 mm, densely villous. Achenes narrowly ovate, ca. 6 × 2 mm, puberulous; persistent style 5--8 cm, plumose. Fl. Nov--Dec, fr. Dec--Jan.
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