Herbs, (annual to) short-lived perennial, 15-40 cm tall, glabrous. Stem weak, slender, leafy and branched throughout. Petiole 1-4 cm (longer in shade-grown plants or in nutrient-rich soil); blade glaucous on both surfaces, 1-4 cm, biternate; primary segments petiolate; ultimate leaflets sessile, entire to 2-4-divided into obovate, obtuse, obscurely mucronate lobes. Racemes 3-12-flowered, lax; bracts much divided or rarely uppermost entire, 3-6 mm. Pedicel 5-15 mm, slender, recurved in fruit. Sepals ca. 1 mm, often deeply divided, rarely minute, entire. Corolla yellow; inner petals with blackish purple apex; upper petal acute or very shortly acuminate, narrowly cristate with crest long decurrent on spur; spur upcurved, 5-7 mm; nectary thick, to 1 mm; lower petal with a basal pouch; inner petals 5-7 mm. Stigma with 4 stalked apical papillae. Fruit obovoid, 5-7 × ca. 2 mm, smooth or minutely papillose all over surface, 4-10-seeded; style ca. 1.5 mm. Seeds in 2 rows, ca. 1.2 mm, smooth. Fl. Jul-Sep, fr. Jul-Oct.
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