Herbs or undershurbs, aromatic. Stem
quadrangular, woolly, pubescent or hirsute. Leaves opposite,
elliptic-lanceolate to broadly ovate, entire to serrate, acute to acuminate.
Inflorescence of dense axillary, often terminal, distant whorls. Calyx
10-nerved, often striate, mouth equal or oblique, teeth 6-10, unequal,
pubescent to hirsute. Corolla upper lip erect, concave, villous, lower lip
3-fid, spreading, mid-lobe larger. Stamens 4, didynamous, ascending under upper
lip, anthers connivent, cells divaricate, confluent. Disk entire or lobed,
uniform or enlarged anteriorly. Styles, subulate, upper lobes minute or
obsolete. Nutlets ovoid, triquetrous, obtuse.