Annual herbs. Leaves entire to sinuate or toothed. Flowers axillary solitary, bisexual, erect, showy. Calyx tubular, persistent in fruit. Corolla tubular-infundibuliform, white or purple, the limb 5-12- lobed or-dentate, plaited. Stamens 5. alternating with the corolla lobes, attached near the base of the corolla tube. Upper part of the ovary 2-locular, lower 4-locular. Style slender, stigma bilobed. Fruit a spinose or tuberculate capsule dehiscing irregularly or by valves. Seeds many, compressed.