Erect, glabrous, aromatic annual, 8-40-(50) cm tall. Stems usually much-branched, sometimes not branched. Lvs 1-pinnate, shortly petiolate; leaflets in 2-5-(7) pairs, narrow-elliptic to lanceolate, 0.5-3 cm long, with (0)-2-5-(6) 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 2-4 cm diam., solitary; peduncles solid or fistular. Involucre cylindric to campanulate, 12-18-(20) × 5-12-(14) mm, with 4-7 short teeth at apex; glands long, many and ± evenly distributed above and below, or few and mostly confined to upper 1/2. Ray florets 5-numerous; ligules yellow to bright orange, or deep red-brown, sometimes bicoloured with red-brown blotch or markings toward base or paler only at margin, 5-15 mm long. Disc florets numerous, yellow or orange, or many or most transformed into ligulate florets. Achenes 3-4-angled, dark brown or black, sparsely clothed in short antrorse hairs especially on angles, 9-12 × 0.7-1 mm; pappus scales fused toward base, the longest 7-12 mm and with minute marginal antrorse hairs.