Annual or perennial, prostrate to erect herbs or undershrubs with usually vinous to scabrid indumentum, rarely glabrous. Leaves alternate, entire. Inflorescence usually of terminal or axillary scorpiod cyme. Flowers small, white, bracteate or not. Calyx usually 5-partite into linear or lanceolate lobes, persistent. Corolla 5-lobed, tubular to infundibuliform, hairy on the outside and sometimes variously so within; lobes ± erect or inflexed, obtuse to linear, with dentations or lobed between them or not. Stamens 5, free, included and attached to the corolla tube; anthers elongated, subsessile, sometimes apiculate. Ovary 4-locular or incompletely 2-locular. Style erect. Stigma ± conical or elongated. Stigmatic disc usury present. Fruit comprising of 2-4 nutlets.