Herbs, annual to biennial, (20-)30-40 cm, glabrous, with taproot. Stems few to several, ascending-erect, ridged, branched, leafy. Basal leaves often many; petiole 5-10 cm, with broad base with membranous margin; blade pale abaxially, green adaxially, triangular, ca. as broad as long, 7-12 × 5-12 cm, bipinnate; pinnae 2-4 pairs, lower pair petiolulate, larger than second pair, upper almost sessile; pinnules sessile, ovate, ± deeply and coarsely crenate-dentate to lobed; teeth/lobes subacute, mucronate. Racemes 5-11 cm, 10-25-flowered; bracts ovate to lanceolate, 4-8(-15) mm, long acuminate. Pedicel 4-8 mm. Sepals rounded to triangular, 1.5-2.5 mm, dentate. Corolla yellow to pale yellow. Outer petals slightly undulate-dentate, usually acuminate, without or with short often dentate crest not reaching apex; upper petal 16-20 mm; spur 6-9 mm, with broad saccate slightly reflexed apex; nectary 1/2-2/3 as long as spur; inner petals 10-13 mm with broad rounded dorsal crests overtopping apex. Stigma 2-forked, each part with 3 papillae, central pair distinct, lateral sometimes indistinct. Capsule linear, moniliform, 18-32 × ca. 2 mm, 7-12-seeded; beak ca. 3 mm; style 3-3.5 mm. Seeds in 1 row, rounded, 1.6-1.9 mm, with rounded back, often densely spinulose, rarely almost glabrous; caruncle thin, membranous, folded back over seed, covering ca. 1/2 of seed. Fl. and fr. Apr-Jul.
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