Glabrous annual, generally branched from base, 10–30 cm tall. Leaves mostly basal, several times pinnatisect; ultimate segments broadened into trifid apex. Inflorescence lax, erect, usually with 3–10 flowers. Sepals 2, entire or rarely bifid, caducous. Petals 4, deep yellow; the outer 8–11 mm, shallowly 3-lobed with flat lobes, the inner petals with black spots. Filaments of medium stamens narrowly triangular; pollen orange-yellow. Fruit erecto-patent, narrowly cylindrical, 50–80 × 2.5–4 mm, often curved, tapering at both ends, with conspicuous transverse articulations and a ridge at each septum.
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