This southeastern species is scattered across much of Ky., especially in submesic woods on non-calcareous soils. It is virtually absent in states to the north and west, except for the Shawnee Hills of s. Ill. and s. Ind. (PL). In Ky. it usually flowers during late Apr to early Jun, about the same time as sylvestris and most other species of the genus; there are no records from July onwards.