Herbs, annual, 50-130 cm tall, with thin taproot. Stems erect to suberect at first, later diffuse, weak, hollow, sharply winged-ridged, branched mainly in upper 1/2 or 2/3. Lower petioles 5-10 cm, in upper leaves 1-5 cm, slightly vaginate at base; blade glaucous abaxially, green adaxially, ovate, 5-13 × 4-8 cm, bi-to tripinnate; primary leaflets ca. 3 pairs, long petiolulate; ultimate leaflets 1 or 2 pairs, shortly stalked, deeply 2-5-divided; lobules obovate to oblong, mucronate. Racemes (10-)20-35-flowered, subsecund; accessory racemes sometimes in upper axils; bracts oblanceolate, acute, often shortly stalked; lower ones divided or with a few acute teeth; middle and upper bracts dentate to entire, sometimes undulate, 3-6 mm. Pedicel 3-5 mm, strongly recurved in fruit. Sepals whitish, ca. 1 mm, deeply dentate. Flowers yellow. Outer petals with broad entire crests usually reaching well beyond apex; spur upcurved, 6-7 mm; nectary ca. 1/2 as long as spur; lower petal without pouch, but sometimes with a minute cornute spurlet at base, slightly constricted between claw and limb; inner petals 6-7 mm. Stigma with deep narrow median sinus, 4 long-stipitate apical papillae, and 2 lateral geminate papillae. Fruit narrowly obovoid to oblong, 8-9 × 2(-2.5) mm, 3-7-seeded; style ca. 2.5 mm. Seeds 1.3-1.5 mm, smooth or densely tuberculate (often in same population); elaiosome small. Fl. May-Sep, fr. Jun-Sep.
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