Erect, ascending, decumbent or prostrate annual, biennial or perennial herb or subshrub to 2.5 m high; stems simple or branched, often gland-dotted and/or resinous. Leaves radical and cauline or mostly cauline, alternate, usually gland-dotted, entire to pinnatifid. Capitula radiate or discoid, pedunculate, in panicles, corymbs or solitary; involucres globose to hemispherical or broadly urceolate, sometimes campanulate to obconical; involucral bracts 3–10 seriate, filiform, linear or lanceolate, usually unequal, chartaceous at base, herbaceous at apex, usually glabrous, usually ± resinous; receptacle flat or convex, naked, pitted. Ray florets 1-seriate, female, yellow to orange; disc florets bisexual or functionally male, yellow, 5-lobed; anthers with ovate apical appendage, rounded at base; style branches with linear or lanceolate hispidulous appendages. Cypselas ellipsoid to obovoid, ± compressed, sometimes ± 3–4-angled, glabrous; pappus of deciduous, rarely persistent, straight or curled smooth to barbellate bristles, subulate scales or awns usually in 1 series.
