Description from Flora of China
Herbs, annual [or perennial], scapiform. Leaves basal [or rarely cauline]. Capitula small, radiate or disciform, solitary, usually pedunculate or on scape, scape bracteate (bracts reduced). Involucre campanulate; phyllaries 2-4-seriate, unequal, membranous, 1-veined (midvein orangish). Receptacles flat or convex, not alveolate, naked. Ray florets female, 1-4-seriate, white to purple; disk florets few, usually sterile, functionally male, yellow, limb campanulate, 4- or 5-lobed; anther base obtuse; style branch tip lanceolate or triangular. Achenes obovate to oblanceolate, flattened, ± glandular apically, margin 2-ribbed, apex rimmed, shortly beaked or not. Pappus absent.
Eighteen species: SE Asia, Australia, New Zealand, South America; one species in China.
(Authors: Chen Yilin (陈艺林 Chen Yi-ling); Luc Brouillet)