Annual herbs, usually very bristly. Infl. terminal, ebracteate or less commonly with basal bracts. Calyx 5-lobed nearly to base, sometimes some lobes connate, often clothed in brownish hairs. Corolla with cylindric tube without scales; limb funnelform or salverform. Stamens included. Stigma capitate. Nutlets ovoid-trigonous, smooth or rugose, attached to receptacle along lower end of ventral keel.