Plant glabrous, with tap root. Rhizome inconspicuous. Stem 14--35 cm tall. Basal leaves few, 5--9-foliolate; petiole 3--8 cm; leaf blade ovate, 1.8--3.5 cm wide, papery; lateral leaflets petiolulate; leaflet blade obliquely ovate, unequal in size and shape, lower leaflets ovate, 0.5--0.9 × 0.5--0.9 cm, upper leaflets obliquely obovate, 0.6--1.4 × 0.4--1 cm; central leaflet reniform to flabellate, 0.5--1.2 × 0.7--1.6 cm, base broadly cuneate, rounded, or truncate, margin distally 3-lobulate or toothed, apex obtuse. Stem leaves opposite, shortly petiolate, similar to basal leaves. Inflorescences 2--4-flowered; bracts sessile, 3-foliolate, 3-sect, or simple. Flowers 6--7.5 cm in diam., glabrous. Pedicel 1--3.5 cm. Sepals white, obovate-elliptic, 4--5 mm. Petal limbs funnelform, 1.8--2.5 mm; claw longer than limb. Stamens 10; anthers broadly ellipsoid, ca. 0.3 mm. Follicles linear, 1.2--1.5 cm, apex acute; persistent styles inconspicuous. Seeds ellipsoid-fusiform, 1.5--1.8 mm, longitudinally costate. Fl. May--Jun, fr. Jun.
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