Herbs, perennial, (20-)30-60 cm tall, glabrous; stems and petioles of radical leaves attenuate to filiform underground base. Storage roots several, oblong, 10-30 × 2-4 mm, set on long thin usually simple stalks 2-5 cm. Stems 1 to few, simple, with 2 or 3 leaves in upper 1/2 or 1/3. Radical leaves: petiole 15-26 cm; blade 3-6 × 5-8 cm, biternate with 7-11 linear leaflets 2-5 × 0.3-0.6 cm, abaxially with 3 raised parallel veins. Cauline leaves subsessile; blade pinnate with 3 or 4 pairs of pinnae like radical leaves. Raceme 4-12 cm, 10-25-flowered; bracts sessile or sometimes shortly stalked, pectinately to flabellately deeply incised into long linear acute lobes, or upper ones (rarely all) lanceolate and only slightly dentate, 8-20 mm. Pedicel 5-9 mm, 10-15 mm and strongly recurved in fruit. Sepals ca. 0.5 × 1 mm, dentate. Petals yellow, usually with distinct brownish purple veins; upper petal 10-13 mm, apex subacute; crest ca. 1.5 mm wide, from apex extended to spur middle or end; spur ± upwardly directed, 6-9 mm, slightly attenuate; nectary thin, extended through (1/3-)1/2(-2/3) of spur; lower petal 8-9 mm, shortly crested, claw indistinct, margin slightly undulate; inner petals 6-8 mm. Stigma square, slightly emarginate, median 2 apical papillae narrow, lateral marginal papillae confluent; geminate papillae lateral and in basal corners; basal lobes hardly developed. Capsule linear-oblong, 9-12 mm, usually glabrous but rarely papillose, 1-6-seeded; style ca. 2.5 mm. Seeds in 1 row. Fl. and fr. Jun-Aug.
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