Stachys clingmanii

Stachys clingmanii, or Clingman's hedgenettle, is a North American species of plant in the mint family. It is found at higher elevations in the Great Smoky Mountains of Tennessee and the Carolinas, with additional populations in Illinois, Indiana, and Vermont. It is a threatened species in Tennessee.
"Stachys clingmanii" is an erect branching herb up to 90 cm (3 feet) tall. It blooms in summer, producing flowers up to 1.5 cm (0.6 inches) long.