Herbs, annual, 20-50(-80) cm tall, much branched. Leaves thin. Middle stem leaves: petiole 2-5 cm; leaf blade triangular-ovate or triangular-elliptic-ovate, 4-6(-11) × 2-3 cm, 2-or 3-pinnatisect; segments 4 or 5 pairs; lobules narrowly linear-lanceolate or filiform, 3-6 × 0.5-1 mm. Synflorescence a broad panicle; capitula usually in groups of 2-5. Involucre subglobose, 2-3 mm in diam. Marginal female florets 10-14. Disk florets 14-25, bisexual. Achenes ovoid-ellipsoid. Fl. and fr. Aug-Nov. 2n = 18.
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