Kral's beardtongue

Penstemon kralii, commonly known as Kral's beardtongue, is a rare species of flowering plant in the family Plantaginaceae. It is a perennial herb endemic to the southwestern escarpment of the Cumberland Plateau in northeastern Alabama and southeastern Tennessee. The species occurs primarily along the edges of dry, calcareous juniper–oak–hickory woodlands developed over Mississippian-aged limestone.