Herbs, summer annual, 20-50 cm tall, with thin taproot. Stems ridged, leafy, much branched, weak, diffuse. Basal leaves long petiolate, often early withering. Cauline leaves petiolate; blade gray abaxially, green adaxially, deltoid, bipinnate with 3 or 4 pairs of distant shortly stalked pinnae; secondary pinnules 1 or 2 pairs, ovate to broadly ovate, ternately divided; ultimate segments rounded-obtuse, slightly mucronate. Raceme 3-10(-15)-flowered, dense at first, elongating in fruit; bracts lanceolate to subulate, 3-5 mm, margin scarious, apex acuminate to mucronate. Pedicel 3-5 mm. Flowers yellow to pale yellow. Sepals caducous, ovate, small. Outer petals obtuse or acute, without or with very narrow slightly dentate crest; spur broadly saccate, ca. 2 mm; nectary extended through ca. 1/2 of spur; inner petals 6-7 mm, with dorsal crest shortly overtopping apex. Stigma bifid, lobes narrow, reflexed-geniculate with 2 papillae flanking apical division, one terminating each lobe, and each lobe usually with a pair of submarginal geminate lateral papillae. Capsule straight, linear, 20-30 × ca. 1.5 mm. Seeds black, rounded in profile, with concentrically arranged small tubercles. Fl. and fr. Feb-Sep.
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