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Branched, perennial herbs. Leaves crenate. Flowers medium-sized, usually in few-flowered, axillary verticillasters. Calyx tubular, always 13-nerved, sometimes not very clearly so due to the reticulation of transverse veins; 2-lipped; upper lip 3-toothed, teeth broad and highly connate, often slightly recurved; lower lip 2-toothed, teeth long and subulate. Corolla straight or ± recurved, long and slender; upper lip emarginate or notched, erect; lower lip 3-lobed, flat and spreading. Stamens 4, didymous, ascending, posterior pair smaller and shorter than anterior pair; anthers 2-celled, cells divaricate. Disk equal-sided. Style lobes subequal. Nutlets obovoid, smooth and dark, often with a very prominent scar.
Perennial herbs; rhizomes short. Lvs simple, toothed. Verticels in axillary whorls, few-to many-flowered, in axils of leaflike bracts. Bracteoles linear, ovate or obovate. Calyx ± campanulate, 13-nerved, not gibbous at base, 2-lipped; upper lip flattened, 3-toothed; lower lip 2-toothed. Corolla 2-lipped; tube > calyx, curved upwards and widening above middle, lacking a ring of hairs; upper lip erect or sometimes deflexed, emarginate; lower lip spreading, 3-lobed. Stamens included, convergent below upper lip; anther cells divergent. Style gynobasic, its branches subequal. Nutlets narrow-obovoid, smooth.
Cal 2-lipped, strongly 13-nerved, angular, sparsely villous, the upper lip flattened, oblong, with 3 conspicuous nerves prolonged into very short, broadly triangular lobes, the lower lip about as long, cleft nearly to the base into narrow, subulate-tipped lobes; cor-tube up curved, the upper lip concave, 2-lobed, the lower lip with rounded lateral lobes and a longer, oblong or obovate median lobe; stamens 4, ascending under the upper cor-lip and about equaling it; nutlets obovoid, smooth. 3, Eurasia.
