Perennial or annual aromatic herbs. Stems erect, branched, with simple hairs. Leaves not divided, serrate, gland-dotted, petiolate. Flowers in shortly pedunculate regular cymes in leaf axils. Bracts small. Calyx tubular or campanulate, 10-nerved, not or scarcely bilabiate, clearly enlarged in fruit and prominently ribbed; tube with vinous hairs; teeth erect, subulate, equal or subequal. Corolla bilabiate, small, inconspicuous; upper lip 2-lobed; lower lip 3-lobed with a somewhat saccate base to the middle lobe; tube slender, not annulate within, scarcely exserted beyond calyx teeth. Stamens 4, included, didynamous, declinate; thecae becoming unilocular, glabrous. Style shortly bifid. Nutlets oblong, clearly compressed, emarginate, often only 1 or 2 developing.