Description from Flora of China
Akylopsis Lehmann; Chamomilla Gray; Lepidanthus Nuttall (1841), not Nees (1830), nor Nuttall (1835); Lepidotheca Nuttall.
Herbs, annual, usually fragrant; indumentum absent or of simple, basifixed hairs. Leaves 1- or 2-pinnatisect. Synflorescences cymose, usually ± flat-topped, sometimes reduced to solitary capitulum. Capitula heterogamous or homogamous, radiate or discoid. Involucres coryliform; phyllaries in 2 or 3 rows. Receptacle conical to subulate, epaleate. Marginal florets when present in 1 row, female, fertile; lamina white. Disk florets yellow or pale green, bisexual; corolla tubular, apex 4- or 5-lobed. Anther bases obtuse; apical appendage triangular. Style branches linear, apex truncate. Achenes small, terete, slightly dorsiventrally compressed, adaxially with 3-5 thin ribs. Corona small or absent or sometimes represented by an adaxial auricle particularly in ray achenes.
About seven species: N Africa, SW and temperate Asia, Europe, North America; two species in China.
(Authors: Shi Zhu (石铸 Shih Chu); Christopher J. Humphries, Michael G. Gilbert)