Herbs or shrubs; stems erect. Leaves elliptic or ovate; petiolate. Inflorescences in loose panicles which are sometimes thyrsoid. Flowers with the calyx segments 4 or 5, narrow, equal; corollas red, orange, yellow or white, cylindrical, basally narrow, abruptly expanded just above the calyx, somewhat obliquely enlarged and oblong, often constricted again at the mouth, the upper lip erect, the lower lip barely distinct from the corolla tube, 3-lobed; stamens 2, attached to the tip of the corolla tube, exserted, the anthers 1-celled, obtuse. Capsules clavate, glabrous, 4-seeded.
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