Stems 40--80 cm tall, subglabrous to sparsely pubescent, apically branched. Basal leaves several, 2-ternate; petiole 10--20 cm; leaf blade abaxially glabrous to subglabrous, adaxially glabrous; lateral leaflets obliquely obovate, unequally 2-lobed; central leaflet cuneate-obovate, 2--6 × 1.8--5 cm, 3-parted and segments with 2 or 3 obtuse teeth. Stem leaves several. Inflorescences cymose, 3--5-flowered; bracts 3-sect, apex obtuse. Flowers slightly pendulous, ca. 4 cm in diam. Pedicel 1--3 cm. Sepals purple, narrowly ovate, 1.6--3.1 × 0.8--1.2 cm, apex acute. Petals yellowish white, suberect, broadly oblong, 1--1.3 cm, apex subtruncate; spur 1.5--2 cm, apically incurved into a hook. Stamens nearly as long as petals; anthers black, oblong, 1.5--2 mm. Staminodes narrowly lanceolate, ca. 7 mm. Pistils 5, white pubescent. Follicles 1.2--3 cm; persistent styles 3--10 mm. Seeds ca. 2 mm. Fl. May--Jun, fr. Jul--Aug.
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