[3][4][5] It is found from Minnesota to Ohio, south to Tennessee, with isolated (and sometimes rare) populations in New York, Pennsylvania, Alabama, and other states.

[6] It is an endangered species in Ontario[7] and threatened in North Carolina.

[8] T. flexipes is a perennial herbaceous plant that spreads by means of underground rhizomes.

[9] The flower petals are normally white but can be reddish or maroon.

Indeed, the red-petaled forms of T. flexipes tend to occur in regions where the ranges of both species coincide.