Prostrate to erect perennials, sometimes rhizomatous; stems not angular. Leaves alternate, often ± rosetted at base. Inflorescence a raceme or corymb, or flowers solitary in axils of upper leaves or bracts; calyx cupular, 5-lobed; corolla 5-lobed, tubular in lower part, lobes spreading; stamens 5, opposite the petals, staminodes 5, alternating with stamens; ovary semi-inferior. Fruit a capsule splitting apically into 5 valves; seeds numerous, minute.
13 species, cosmopolitan but mainly Southern Hemisphere; 4 species indigenous in Australia.