Stem 1--3, erect, 20--40 cm tall, 2.5--3.5 mm in diam., basally villous, glabrate. Basal leaf 1, deciduous, 2-ternate; petiole 11--13 cm, sheath membranous; leaf blade triangular. Stem leaf usually 1, borne on upper 1/3 of stem; leaf blade triangular, ternate; petiolules 1.8--4.5 cm; leaflet blade 2.5--7 × 2.5--7 cm, 3-sect; lateral segment petiolule 0.2--2.5 cm; segment blade obliquely ovate, abaxially glabrous to subglabrous, unequally parted; central segment rhombic, 1--1.2 cm wide, apically 3-lobed, unequally toothed. Inflorescences 1--8-flowered, glabrous; bracts 3, leaflike, subsessile, ovate-rhombic, to 5 cm. Flowers 1--1.5 cm in diam. Pedicel 0.7--3 cm. Sepals 5, white, elliptic, 4--6 mm, apex obtuse. Anthers ellipsoid. Pistils obliquely ovoid. Follicles obliquely ovoid-ellipsoid, ca. 8 × 3 mm, glabrous; veins raised; persistent styles ca. 2 mm, slightly curved. Seeds usually 2, ovoid to ellipsoid, ca. 1.5 mm, densely and finely setose. Fl. May, fr. May--Jul.
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