Description from Flora of China
Herbs, annual [or perennial], often prostrate. Leaves alternate, oblong-obovate to spatulate, lyrate-pinnatifid or serrate-dentate. Capitula disciform, globose, solitary or in laxly corymbiform synflorescences. Involucre patelliform; phyllaries 2- or 3-seriate, slightly unequal, herbaceous, inner series scarious at apex. Receptacle swollen, hemispheric or obconic, naked. Florets yellow. Marginal florets female, 1- to many seriate, corolla tubular, of outer usually 2-lobed, of inner 3- or 4-lobed; disk florets bisexual, fertile, limb narrowly campanulate, 4- or 5-lobed; anther base obtuse, apical appendage lanceolate; style branches truncate, obtuse or with triangular appendage, sometimes simple. Achenes compressed or subcylindric, apex truncate, often ringed. Pappus absent.
Nine species: tropical and subtropical Africa and Asia; one species in China.
(Authors: Chen Yilin (陈艺林 Chen Yi-ling); Luc Brouillet)