Description from Flora of China
Herbs, annual, prostrate. Leaves alternate, lyrate or entire. Capitula small, disciform, orbicular or oblong, in racemiform or paniculiform synflorescences, rarely solitary. Involucre patelliform; phyllaries 2- or 3-seriate, margins narrowly scarious, fimbriate. Receptacle globose or obconic, swollen, alveolate, naked. Florets fertile; marginal female many seriate, white or yellow, without tube, lamina narrowly cylindric, funnel-shaped, campanulate, or ovoid to urceolate, 2- or 3-lobed; disk florets bisexual, yellow or reddish, tube short, limb narrowly campanulate, 4- or 5-lobed; anther base obtuse; style branch tips lanceolate. Achenes obovoid, compressed, glabrous, sometimes basally and apically glandular, green apically, margins strongly 2-ribbed, of female florets sometimes faintly so. Pappus absent, of disk florets ± coroniform, sometimes with 1 or 2 short setae.
Four species: Africa, tropical Asia; three species in China.
(Authors: Chen Yilin (陈艺林 Chen Yi-ling); Luc Brouillet)