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