Corolla tubular, 5-lobed, limb spreading, lobes almost entire.
Leaves opposite or alternate, pinnatisect, dentate to entire.
Perennial undershrub, many-stemmed from a woody rootstock.
Capsule compressed perpendicular to septum, loculicidal.
Ovary bilocular, globular, compressed; ovules numerous.
Style slender, glabrous, exserted, incurved above.
Seeds numerous, obovoid-cylindrical.
Calyx 5-lobed, campanulate.
Flowers solitary, axillary.