Annual herbs. Lvs simple, toothed. Verticels in dense, terminal and axillary whorls, the uppermost crowded, the lower distant. Bracts resembling, but smaller than, foliage lvs; bracteoles subulate, pungent or spine-tipped. Calyx tubular-campanulate, not gibbous at base, 5-toothed; teeth rather unequal, pungent. Corolla 2-lipped; upper lip hooded; lower lip 3-lobed, with 2 conic projections at base; tube = or much > calyx, straight, with ring of hairs inside. Stamens lying beneath upper lip; anthers ciliate, parallel. Style gynobasic. Nutlets bluntly trigonous.