Subshrubs erect or perennial herbs, (0.6--)1--1.5 m tall. Branches shallowly 6--10-grooved, puberulous, glabrescent, often simple. Leaves simple, sessile; leaf blade broadly ovate to ovate, 4--14 × 2.5--11 cm, papery, both surfaces glabrous, base rounded to broadly cuneate, margin entire and abaxially crisped pubescent, apex acuminate to acute; basal veins abaxially prominent. Flowers solitary, terminal, ca. 4 cm in diam., nodding. Pedicel 5--16 cm, densely puberulous but velutinous near apex. Sepals 4, purple, blue, or white, erect, oblong-lanceolate, 3--4.5 × 0.7--1.2 cm, often widened apically, both surfaces glabrous, margin abaxially velutinous, apex acuminate and recurved. Stamens ca. 1/2 as long as sepals; filaments apically pubescent; anthers linear, 4.2--5 mm, abaxially densely pubescent on connective, apex minutely apiculate. Ovaries puberulous. Style as long as stamens, densely villous. Achenes narrowly obovate, 6--10 × 4--5 mm, puberulous; persistent style 4--5 cm, plumose. Fl. Jun--Jul, fr. Aug.
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