Terrestrial or rarely epiphytic herbs or shrubs; roots fibrous; stems succulent or woody, erect, terete. Leaves opposite, membranous to subcoriaceous, the stomata in groups on the lower surface. Inflorescences axillary; peduncles usually elongate, rarely lacking; bracts lacking. Flowers 1 to many per inflorescence; calyx lobes ovate to lanceolate, pubescent; corolla spurred, oblique in the calyx, either ventricose at the middle and the mouth constricted or narrowly campanu-late with a broad, subregular to bilabiate limb, often spotted; stamens 4, in-cluded, the filaments adnate to the base of the corolla tube; disc annular and thickened posteriorly, reduced to the posterior glands, or semi-annular; ovary superior. Fruit a 2-or 4-valved fleshy capsule, laterally and apically compressed; seeds numerous.
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