Herbs, perennial, 30-60 cm tall, glabrous. Rhizome short, with small apical leaf rosette. Stems slender, procumbent at base, rooting at nodes, distally ascending to erect, branched above, with 5-9 leaves. Rosette leaves several; petiole 3-9 cm, base vaginate; blade reniform, 2.5-4.5 × 2.5-5 cm, biternate; primary leaflets stalked, secondary subsessile, entire to ± deeply ternatifid, with deep narrow acute teeth. Lower cauline leaves: petiole 3-6 cm, upper ca. 1 cm; blade like rosette leaves. Raceme simple or with a basal branch, ca. 10-flowered, 1.5-5 cm, at fruiting to 7 cm; lower bracts petiolate, slightly 3-divided; segments incised-dentate, uppermost bracts narrowly oblanceolate and entire. Pedicel erect, 5-12 mm, thin. Sepals broadly ovate, ca. 2 × 1.5 mm, irregularly lacerate. Corolla lavender; outer petals broadly obtuse, dentate, mucronate, dorsal crest absent or small, not extended to apex; upper petal 13-17 mm, spur narrowly cylindric, almost straight; nectary ca. 1/2 as long as spur; lower petal 7-9 mm with short claw and broad rounded sharply dentate limb; inner petals 7-8 mm. Stigma square, with 4 simple marginal papillae; geminate papillae lateral and in basal corners. Capsule pendent from erect pedicel, linear, 10-11 × ca. 1.5 mm, 6-9-seeded, explosively dehiscent; style ca. 2 mm. Seeds in 1 row, ca. 1.3 mm, smooth. Fl. and fr. Jun-Aug.
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