Annual herbs, glabrous or sparsely pubescent with simple hairs. Leaves alternate, simple, entire or irregularly toothed, petiolate. Flowers solitary in leaf-axils, bisexual, regular; calyx, 5-lobed, enlarged in fruit, persistent, lobes ovate, appressed along their margins, sagittate at base; corolla broad-campanulate, shortly 5-lobed, pale blue to mauve, lobes folded in bud; stamens 5, equal, inserted near base of corolla-tube, anthers 2-celled, dorsifixed, dehiscing by longitudinal slits; ovary 3–5-celled, stigma with 3–5 stigmatic areas. Fruit a dryish berry enclosed by inflated calyx; seeds reniform to lenticular, numerous.
A monotypic genus from Peru.