Annual or perennial herbs with procumbent or erect stems. Lvs simple, toothed or entire. Infls axillary and terminal. Verticels with up to c. 8 fls; bracts similar to lvs. Calyx tubular, 13-nerved; tube usually curved; base gibbous with tuft of white hairs at throat; limb 2-lipped; lower lip with longer teeth. Corolla 2-lipped; tube straight, glabrous within. Stamens < corolla, curved. Style gynobasic, its branches unequal, upper subulate, lower longer and wider. Nutlets obovoid to oblong.

Perennial herbs with erect to rather straggling stems. Lvs simple, usually toothed. Verticels in dense, many-flowered, terminal and axillary whorls. Bracts resembling foliage lvs; bracteoles subulate, prominent. Calyx tubular, curved, not gibbous at base, 13-nerved, 2-lipped. Corolla 2-lipped, hairy outside; upper lip emarginate; lower lip 3-lobed with the middle lobe largest; tube straight. Stamens included, convergent below upper lip. Style gynobasic, its branches unequal, the upper subulate, the lower longer and wider. Nutlets subglobose, smooth.