Annual or perennial herbs or shrubs, rarely climbers; indumentum of simple unicellular and/or septate hairs, or glabrous. Leaves alternate, sessile or petiolate, entire, toothed, lobed or pinnatisect, often with basal, stem-clasping auricles. Inflorescence usually of few–many, pedunculate capitula, in terminal or near-terminal corymbs or panicles, less commonly capitula solitary. Capitula of 1 of 3 types: radiate, with marginal, ligulate female florets and disc florets tubular and bisexual; non-radiate with all florets tubular and bisexual; non-radiate with outer florets tubular and female, and inner florets tubular and bisexual. Involucre cylindric to campanulate; bracts uniseriate, equal, usually with a few much shorter 'bracteoles' encircling the base. Ligulate florets, when present, uniseriate, usually yellow, rarely purple or white, style arms linear, truncate or rounded apically; disc florets yellow, usually 5-lobed, anthers obtuse, acute or shortly tailed at base, with an ovate to triangular apical appendage. Cypselas mostly c. cylindric, pubescent (often in lines) or glabrous; pappus of 1 or 2 series of smooth to barbellate bristles, usually weakly attached to thickened rim at apex of cypsela.
Cosmopolitan, perhaps the largest genus of flowering plants with c. 1300 species; 97 species in Australia, all except 4 species endemic, and 13 which are introduced (Thompson 2015).
Thompson, I.R. (2015). Trib. 1. Senecioneae , 209-315, in: Wilson, A. (ed.), Flora of Australia Volume 37, Asteraceae 1, ABRS/CSIRO Publishing, Canberra/Melbourne.