Annual or perennial herbs. Leaves radical or cauline, alternate or opposite, entire or pinnately lobed, exstipulate. Inflorescence cymose or terminal racemes. Flowers hypogynous, hermaphrodite, pentamerous. Sepals united at the base, imbricate. Corolla gamopetalous, rotate, campanulate or funnel-shaped. Stamens epipetalous, often with appendages. Carpels 2, united; ovary 1- or 2-celled with parietal placentation when unilocular and axile when bilocular; ovules many; styles 1 or 2. Fruit capsular.