Perennial with erect stems. Leaves 2.5 cm long, ovate, with fine saw teeth, dark green, almost hairless, gland-dotted. Flower clusters dense, spikes 10 mm long, bracts obovate, 7 mm long, purple, almost hairless. Calyx equally 5- lobed, purple. Corolla 10 mm long, upper lip notched, deep purple. Stamens with 5 mm protruding and 3 mm under upper lip.
Though possibly a hybrid, this seems to be just a selection of subsp. vulgare.