Terrestrial herbs; stems perennial, erect, short, the internodes short, pubescent. Leaves alternate, arranged spirally, mainly clustered at the stem apex, oblanceo-late to obovate, membranous or succulent, green, stomata in groups; petioles often short. Inflorescences in the upper leaf axils; either peduncles or pedicels elongated, pubescent; bracts lacking. Flowers small; calyx lobes 5, triangular to ovate, pubescent; corolla mainly white with yellow inside the tube and/or reddish spots, the tube spurred at the base, oblique in the calyx, funnelform, zygomorphic, the limb broad; stamens 4, included with an infertile dorsal staminode, the anthers dehiscing by longitudinal slits; disc reduced to a shallow or deeply bilobed posterior gland; ovary superior, pubescent, the stigma stomatomorphic. Fruit a dry, bivalved capsule surrounded by the persistent calyx; seeds broadly fusiform, numerous, striate.
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