Stems 30--40 cm tall, glabrous, apically few branched or simple. Petiole 3--10 cm; leaf blade 4--8 × 5--11 cm, abaxially glabrous, adaxially scabrous or minutely strigillose at veins; central segment rhombic, margin incised dentate; lateral segments obliquely flabellate, unequally 2-parted. Flowers ca. 2.5 cm in diam. Sepals yellow, narrowly obovate or elliptic, ca. 1 cm, glabrous, apex rounded. Stamens ca. 6.5 mm. Follicles 35--50, 6.5--8 × 4--5 mm; persistent style ca. 0.8 mm; projection inserted near base of abaxial suture. Fl. Jun--Jul, fr. Jul--Aug.
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