Perennial herbs or small shrubs; rhizomes sometimes present, occasionally tuberous; hairs usually stellate or dendroid, often pilose or tomentose. Lvs simple, usually toothed. Bracts usually similar to lvs. Verticels few- to many-flowered, often very dense in distant whorls. Calyx tubular, or narrow-campanulate, not gibbous at base, 5-10-nerved; teeth 5, equal or unequal. Corolla 2-lipped, purple to pink or yellow; tube < to = calyx; upper lip hooded or at least concave, generally tomentose and curving over lower lip; lower lip patent, 3-lobed. Stamens exserted; 2 filaments often with appendages at base; anther cells divergent. Style gynobasic; branches unequal. Nutlets trigonous, glabrous or hairy.