Herbs, annual, 25-90 cm tall, with small taproot. Stems diffuse to suberect, branched throughout, narrowly winged-ridged. Petiole long vaginate, 5-13 cm, shorter in upper leaves; blade triangular, 3-12 × 4-12 cm, (bi-)tripinnate or (bi-)triternate; leaflets shallowly cleft; ultimate lobes obovate, mucronate. Racemes dense at first, 5-16-flowered, much elongating in fruit; bracts broadly lanceolate to rhombic, 4-8 × 2-4 mm, irregularly papillose-scabrid along margin, entire, apex acuminate. Pedicel 2-4 mm, recurved in fruit. Sepals minute. Corolla dull white, with yellowish green keels, rarely (in sunny situations) dull purple; outer petals rather narrow at apex, acute, margin dentate, very narrowly crested; spur of upper petal ca. 5 mm, broad, obtuse; nectary 2/3-3/4 as long as spur; lower petal shallowly to strongly saccate; inner petals 5.5-7 mm. Stigma with broad median sinus, apical papillae 4. Fruit obovoid, 8-10 × 3-4 mm, smooth or very finely papillose-puberulent, (1-)6-9-seeded; style ca. 2 mm. Seeds in 2 rows, 1.5-1.6 mm, smooth, with small elaiosome. Fl. and fr. Jul-Oct.
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