According to the medieval Doctrine of Signatures, which held that a plant’s appearance pointed to the ailment it treated, lungwort was deemed effective for chest ailments because its leaves resembled lung tissue.
Native to Europe and the Caucasus, lungwort is a perennial, growing to a foot high, producing clusters of pink-purple flowers and broad, oval, basal leaves which are gathered in late spring. The smaller upper leaves are mottled with white spots. The plant flourishes in mountain pastures and in damp areas.
According to the medieval Doctrine of Signatures, which held that a plant’s appearance pointed to the ailment it treated, lungwort was deemed effective for chest ailments because its leaves resembled lung tissue.