Perennial, rather coarse, herb. Stems erect, quadrangular, usually branched above, with a variable indumentum of eglandular or glandular hairs. Leaves ovate-oblong to oblong, distributed over stem or mostly basal, c. 5-20 x 3-10 cm, variable in size, erose to crenulate, rugose, cordate, eglandular pilose with many oil globules; petiole up to 10 cm. Inflorescence usually a broad panicle. Verticillasters 2-6-flowered, mostly distant. Bracts ovate, c. 5 x 4 mm. Pedicels 1-2 mm, erect-spreading. Calyx tubular-campanulate, 6-8 mm in flower and to c. 10 mm in fruit; upper lip of calyx in fruit strongly recurved, bisulcate; indumentum of glandular and or eglandular hairs. Corolla violet blue to lilac, 12-15 mm; tube 7-9 mm, ventricose, not squamulate within; upper lip ± falcate. Lower theca sterile, dolabriform. Nutlets c. 2.5 x 2 mm, ovoid or obovoid.