Herbs 40-100 cm tall, annual. Stem apically densely glandular hairy. Basal leaves, lower stem leaves, and middle stem leaves with petiole 3-7 cm, unwinged, basally not or scarcely widened; leaf blade pinnatisect, ± glabrous, margin very shallowly mucronulate-dentate or entire; lateral lobes 2-8 pairs, opposite to obliquely opposite; basal lateral lobes rhombic to elliptic, 5-20 × 4-10 mm; other lateral lobes linear-elliptic to linear-lanceolate, 2.5-6 × 0.5-2 cm, apex acute to acuminate; terminal lobe linear-elliptic to linear-lanceolate, 6-10 × 0.3-1.5 cm, apex acute to acuminate. Upper stem leaves shortly petiolate or sessile, similar to middle stem leaves or 3-parted; uppermost stem leaves linear-elliptic, undivided. Synflorescence paniculiform to corymbosely so, with many capitula. Capitula with usually 10-15 florets. Involucre 9-11 × ca. 3 mm. Outer phyllaries triangular to lanceolate, largest ca. 3 × 0.3-0.5 mm, apex acute; inner phyllaries 8, apex ± obtuse. Florets bluish purple. Achene ca. 4 mm, attenuate into a ca. 1 mm beaklike apex. Pappus 5-6 mm. Fl. and fr. Apr-May.
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