Herbs, annual, 15-50 cm tall, glabrous. Stems ascending at very base, very strict and erect, green or often reddish, conspicuously attenuate toward tip, much branched from base, sharply ridged, leafy and branched throughout with erect branches. Petiole 3-4 cm, base with long broad sheath; blade glaucous on both surfaces, bipinnate; primary leaflets 2 or 3 pairs, petiolate; secondary leaflets cut into 3-5 obovate, obtuse, mucronate lobes. Racemes 4-7-flowered, lax, further elongating in fruit; lowest bracts often like upper cauline leaf, middle and upper bracts often reddish, lanceolate-spatulate to rhombic-obovate, 4-10 mm. Pedicel 4-6 mm, rigidly arcuately recurved at base in fruit (lowermost pedicels sometimes to 11 mm). Sepals whitish, ovate to obovate, 2-2.5 × ca. 2 mm, dentate to bidentate. Petals yellow to dirty orange-yellow with darker veins; inner petals tipped with dark purplish brown. Outer petals narrow, navicular, subacute, sometimes with short mucro, not crested; upper petal 15-18 mm; spur straight, 8-10 mm, slender, tapering toward apex; nectary extended through ca. 2/3 of spur; inner petals 6-8 mm, claw ca. 1/3 as long as limb. Style swollen below stigma; stigma peculiar, with apical and lateral simple papillae, a pair of geminate lateral submarginal papillae and 2 basal geminate papillae set on prominent basal lobes; stigma slightly narrowed above basal lobes. Capsule oblong, 14-17 × 2.5-3 mm, explosively dehiscent, 10-16-seeded; style ca. 2 mm. Seeds ca. 1.5 mm, smooth. Fl. and fr. Aug.
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