Herbs perennial, ca. 60 cm tall, rhizomatous. Stems erect, simple or branched above, glabrous except for leaves. Basal leaves withered by flowering. Cauline leaves 5-8, simple, deeply 3-lobed; petiole 0.5-5 cm, with a broad wing 2-6 mm wide and extending along entire length, base amplexicaul; auricles broadly oblong or ovate, to 6 × 4 mm; terminal leaf lobe ovate to ovate-lanceolate, 4-8 × 2-4 cm, sparsely hirsute with stout trichomes to 0.4 mm, sessile and base decurrent with lateral lobes, margin serrate-crenate, ciliolate with trichomes less than 0.1 mm, teeth mucronate, apex acute or acuminate; lateral lobes similar to terminal but smaller. Fruiting pedicels divaricate-ascending, 5-10 mm, straight, glabrous. Sepals ovate-oblong, 2-3 × ca. 1.5 mm, glabrous, lateral pair subsaccate. Petals purple, obovate, ca. 7 × 3 mm, not clawed. Median filaments pairs 2.5-3 mm, lateral pair 1.5-2 mm; anthers ca. 0.6 mm. Ovules 8-12 per ovary. Fruit linear, 0.8-1.2 cm × 1-1.2 mm; gynophore ca. 0.5 mm; valves glabrous, smooth; style 0.5-2 mm. Seeds dark brown, oblong, 1.3-1.7 × 0.7-0.9 mm, wingless. Fl. May, fr. Jul.
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