Annual or perennial herbs, herbaceous, with simple hairs. Leaves undivided, margins lobed, crenate or serrate, reniform to ovate, petiolate or sessite. Verticillasters many-flowered, in axils of upper leaves. Bracts small, linear. Flowers white, cream, pink or purplish. Calyx tubular or campanulate, not or scarcely bilabiate, 5-nerved; teeth ± equal, as long as or dearly longer than tube; tube internally glabrous or pilose. Corolla clearly longer than calyx, bilabiate; upper lip straight or hooded; lower lip equal to or shorter than upper, 3-lobed; tube exserted beyond calyx teeth, straight or curved, annulate or not within. Stamens 4, didynamous, anterior pair longer than posterior, included under upper lip of corolla; thecae bilocular, spreading, prominently bearded. Style clearly 2-lobed. Nutlets clearly trigonous below, obovoid, substipitate, laterally almost flanged, apically truncate-rounded, smooth, with or without irregular raised white blotches.