Herbs to suffrutescent shrubs. Stems prostrate, ascending or erect, glabrous or pubescent. Leaves sessile or petioled, mostly entire. Inflorescence cymose, capitate, or spicate, terminal or axillary. Flowers subtended by foliaceous bracts and bracteoles; calyx deeply 5-parted, usually subulate setaceous, ciliate; corolla 5-merous, obscurely or distinctly bilabiate, the tube erect, the limb spreading; stamens 4, didynamous, the anthers 2-celled, the cells oblong, minutely calcarate to mucronate at the base. Capsule included in the persistent calyx, oblong linear, glabrous, separating with difficulty at maturity into 2 valves; seeds 2-4, flattened, suborbicular, with mucilaginous hairs when wet.
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