Herbs, annual, glaucous, (10-)20-50 cm tall, with taproot. Stems leafy, branched, rather weak and diffuse. Leaves long stalked; petiole 7-10 cm; blade pale glaucous abaxially, green adaxially, bipinnate, narrowly ovate in outline, 6-16 × 3-7 cm; pinnae (2 or)3 or 4 pairs, petiolules 5-15 mm, pinnules 1 or 2 pairs per pinna, ovate, 7-15 × 6-12 mm, base cuneate, margin irregularly rounded incised-dentate. Upper leaves sometimes almost simply pinnate with larger pinnae. Racemes terminal, and sometimes axillary from upper leaves, 10-27-flowered, 5-10 cm in flower, elongating to 10-22 cm in fruit; bracts narrowly lanceolate, 2-3 mm, apex mucronate. Pedicel 2-3 mm, at fruiting recurved. Flowers pale yellow. Sepals early falling, subcordate, ca. 1 mm. Outer petals with rounded-obtuse to almost retuse apex, shortly mucronate; at least upper petal usually with a short, broad, entire dorsal crest; upper petal 9-10 mm; spur 2.5-3 mm, rounded-obtuse; nectary extended through ca. 1/2 of spur; inner petals 7-8 mm; dorsal crest rounded, extending beyond apex; claw equaling limb. Stigma bifid with deflexed-geniculate lobes, with 4 papillae. Capsules pendent, linear, straight to usually slightly arcuate, 20-34 × ca. 1.5 mm. Seeds black, shiny, ca. 1 mm, rounded, keeled, with concentrically arranged small linear pits. Fl. May-Aug, fr. Jun-Sep.
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