Description from Flora of China
Herbs, annual or perennial. Leaves alternate. Capitula discoid or rarely radiate, often pendulous by anthesis, when discoid homogamous; florets numerous, bisexual. Involucre cylindric, calyculate; phyllaries uniseriate, subequal, linear-lanceolate, with narrow scarious margins, erect at anthesis, later spreading and reflexed; receptacle flat, glabrous, areolate. Corolla finely tubular, upper part gradually expanded into a short limb; lobes 5. Anthers obtuse or auriculate at base. Style branches slender, papillose, with a short to long appendage of fused papillae. Achenes narrowly cylindric, ribbed, with gray-white ring at apex. Pappus hairs fine, numerous, white, early deciduous.
About 21 species: mainly in tropical Africa; two species (both introduced) in China.
(Authors: Chen Yilin (陈艺林 Chen Yi-ling); Bertil Nordenstam, Charles Jeffrey)