Erect, glabrous, aromatic annual, up to c. 60 cm tall. Stems much-branched or sparingly branched. Lvs 1-pinnate, shortly petiolate; leaflets in 2-4-(8) pairs, narrow-elliptic to lanceolate, 1-4-(5) cm long, with 2-10-(20) teeth on each side, and scattered, large, sessile glands on both surfaces. Upper cauline lvs smaller than lower, with fewer, narrower leaflets and fewer leaflet teeth. Capitula c. 4-6 cm diam., solitary; peduncles fistular. Involucre campanulate, (12)-15-20 × (6)-8-18 mm, with 5-7 short teeth at apex; glands long, many, ± evenly distributed above and below. Ray florets 8-numerous; ligules pale yellow to bright orange, 10-30 mm long. Disc florets numerous, yellow or orange, or many or all transformed into ligulate florets. Achenes 3-4-angled, dark brown or black, moderately clothed in short antrorse hairs especially on angles, c. 10-11 × 1-1.3 mm; pappus scales fused toward base, the longest c. 11-12 mm and with minute marginal antrorse hairs.