Annuals, dwarf to small, 1–15 (–30) cm tall. Leaves basal, canaliculate or rarely ±flat or ±terete, non-septate, acute; auricles absent, marginal; sclerenchyma absent. Lower bract inconspicuous or leaf-like. Inflorescence terminal, usually of 1–7 subsessile to pedunculate 1–12 (–20)-flowered heads; floral bracteoles absent; peduncles not incrassate. Seeds subglobose to oblong-ellipsoid, minutely apiculate, reticulate to ±smooth; appendages absent.