Vines perennial, herbaceous. Stems shallowly longitudinally 4--6-grooved, sparsely pubescent, glabrescent; nodes swollen. Leaves usually pinnate, 5-foliolate, sometimes 1-or 2-ternate; petiole 4--7.5 cm, base ± dilated; leaflet blades narrowly ovate to ovate, 3--4.5 × 1.4--2.4 cm, papery, both surfaces sparsely pubescent on midvein, base broadly cuneate to rounded, margin entire, apex acute and apiculate; basal veins abaxially ± prominent to nearly flat. Cymes axillary, 1-flowered; peduncle 2--5 cm; bracts sessile, broadly ovate, 2.5--4 cm, undivided or 3-lobed, margin entire. Flowers 3--5 cm in diam. Pedicel 5--6.6 cm, pubescent. Sepals 4, purple-red to blue-purple, spreading, oblong to narrowly oblong, 1.5--2.5 × 0.5--0.7 cm, abaxially densely appressed pubescent, adaxially glabrous, margin abaxially velutinous, apex ± acute. Stamens 1--1.6 cm, glabrous; anthers linear, 6--7.2 mm, apex minutely apiculate. Ovaries pubescent. Style 8--10 mm, densely villous but puberulous near apex. Achenes rhombic-obovate, ca. 5 × 3.2 mm, pubescent; persistent style 3.5--5 cm, yellowish plumose. Fl. May, fr. Jun.
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