Corydalis is a genus of about 470 species of annual and perennial herbaceous plants in the fumewort family. Herbs, perennial. Tuber yellow, rounded, (0.5-)1-2.5 cm in diam. Stems erect, 10-30 cm, with 1 or sometimes 2 scale leaves, with 2 or often 3(or 4?) cauline leaves, scales and lower cauline leaves often with axillary tuber. Leaves biternate or nearly triternate; leaflets 2-2.5 cm × 5-8 mm, entire to deeply trifid with lanceolate entire acute segments; lowermost cauline leaf often long petiolate and vaginate at base. Raceme lax, 5-15-flowered; bracts lanceolate or narrowly ovate, 5-12 × 2-5 mm, margin entire, apex acute, sometimes lower bracts slightly divided. Pedicel ca. 10 mm at flowering, in fruit to 20 mm. Flowers amaranth. Sepals caducous, small. Outer petals with broad dentate limbs, emarginate with a mucro in notch; spur of upper petal upcurved, cylindric, 11-13 mm; nectary extended through ca. 1/2 of spur, apex obtuse; lower petal with short claw; inner petals 8-9 mm, claw longer than petal lobes.