Leaves solitary or clustered on cushions which are small lateral branchlets, simple 1-jugate or imparipinnate.
Capsule oblong to elliptic compressed, splitting perpendiculary to the septum into 2 smooth valves.
Calyx short, campanulate, 5-toothed with or without hairs, opening early in bud.
Corolla campanulate with 5 broad spreading lobes, bright yellow, white or pink.
Flowers borne in fascicles on lateral cushions or solitary, shortly pedicelate.
Ovary bilocular; ovules biseriate in each locule.
Disk saucer-shaped, entire or lobed, thick.
Seeds numerous, paper-winged.
Spiny shrubs or small trees.