Betonica macrantha

Betonica macrantha, formerly Stachys macrantha, known as big betony, is a species of flowering plant in the mint family Lamiaceae. It is native to the Caucasus, northeastern Turkey, and northwestern Iran. Growing to tall by broad, it is an erect herbaceous perennial with scalloped cordate leaves. Spikes of hooded purplish-pink flowers are borne throughout summer.
The Latin specific epithet macrantha means "large-flowered".
The cultivars 'Robusta', 'Superba', and 'Violacea' have gained the Royal Horticultural Society's Award of Garden Merit.