Annual or perennial herbs, subshrubs or shrubs. Inflorescence a spike, raceme or panicle; flowers in 2-many-flowered whorls; bracts usually reduced, rarely similar to the upper leaves. Calyx 2-lipped; upper lip entire or 3-toothed, the central tooth often shorter or obsolete; lower lip equally 3-toothed, longer than the upper. Corolla 2-lipped; tube usually enlarging towards the throat; upper lip usually longer than lower, usually concave and ± flattened; lower lip spreading, 3-lobed, the central lobe usually much larger than the 2 lateral. Stamens 2, ascending; staminodes 2, small and usually inconspicuous. Style included or exserted. Readily recognised by the combination of ascending stamens and the number of stamens (2).