Betony, Stachys officinalis, is as its ‘official’ specific name indicates, a medicinal herb used, without scientific proof, “to treat anxiety, gallstones, heartburn, high blood pressure, migraine and neuralgia, and to prevent sweating. It can also be used as an ointment for cuts and sores” (according to Wikipedia). It is widespread across Europe, but unobtrusive, though its handsomely crenellated leaves with their long stalks, and the largish flower with a tube longer than the calyx, make it a rewarding find. Once you know it, you’ll see it everywhere.

Lower leaf of Betony: the stalk is longer than the leaf-blade, and the basal leaves form a persistent rosette.