Liatris scariosa

Liatris scariosa (L.) Willd.
Engl.: prairie gayfeather, backache root, gay-feather, large button snakeroot, tall gayfeather.
Bot. syn.: Lacinaria scariosa (L.) Hill, Liatris borealis Nutt., Liatris novae-angliae (Lunell) Shinners, Liatris x niewlandii (Lunell) Gaiser.