Annual or perennial, erect or prostrate herbs with coarse, rigid, basally multicellular hairs on stems and leaves. Leaves cauline, alternate, sessile, narrowly oblong, entire or ±dentate to pinnatifid. Capitula radiate, solitary, terminal or in leaf-axils; involucre ±urceolate, multiseriate; bracts united, becoming hardened to envelope achenes after anthesis; receptacle flat, alveolate; paleae absent. Ray florets uniseriate, male; ligule yellow or reddish, rarely with basal blotch and a blackish dorsal stripe or streak. Disc florets bisexual, outer ones functionally female, inner ones functionally male with sterile ovaries; limb lobes with sclerified margins and large or small, spinuliform hairs; apical anther appendages ±fringed on margins. Achenes obovate, sericeous at apices; seeds germinating while still in old capitula. Pappus scales uniseriate, minute, inconspicuous, hidden among achene hairs.
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