Native to the Finger Lakes Region, Europe, Asia, N America
In European folk medicine tea made from the whole plant was renowned for treating sore throats and tonsillitis. It was also used to stop internal hemorrhaging as well as external wounds.
Source of plant
Glabrous or sparingly pubescent perennial with stems to 50cm long; leaves 5cm long and 2cm wide, ovate to broadly ovate, margins usually entire, the petioles 1-4 cm, inflorescence subtended by a pair of leaves; corolla dark blue, purple, or rarely white.
USDA Hardiness Zone