Vines woody. Branches indistinctly 6-angulate, appressed pubescent. Leaves usually simple, rarely ternate; petiole 4--8 cm, pubescent; leaf blade narrowly ovate to cordate, 6--12 × 3--7.5 cm, papery, abaxially densely gray pubescent, adaxially sparsely pubescent, base cordate to rounded, margin entire, apex acuminate; basal veins abaxially prominent. Flowers solitary, terminal, 7--15 cm in diam. Pedicel 5--10 cm, densely pubescent. Sepals (5 or)6, purplish, spreading, rhombic-elliptic to obovate-elliptic, 4--7 × 2--3.5(--4.5) cm, abaxially densely appressed pubescent along central longitudinal veins, adaxially glabrous, apex acuminate. Stamens 1.3--2 cm, glabrous; anthers linear, 6--10 mm, apex minutely apiculate. Ovaries pubescent. Style 7--10 mm, densely villous but apically glabrous. Achenes obdeltoid to rhombic, 4--5(--8) × 4(--6) mm, appressed pubescent; persistent style 4--6 cm, yellow plumose. Fl. Jun--Jul, fr. Jul--Aug.
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