Corolla campanulate, oblique, narrow at base, dilated above, 5-lobed; lobes subequal, rounded.
Calyx 5-lobed, campanulate, lobes subequal, shorter than tube.
Capsule ovoid, equalling to somewhat longer than calyx.
Seeds numerous, narrowly cylindric usually tapering.
Flowers opposite, bracteate, pedicellate.
Ovary bilocular, ovoid, glabrous.
Annual or perennial herbs, erect.
Leaves opposite, entire.
Inflorescence racemose.
Ovules numerous.
Stems simple.