This species is widely scattered across western and northern regions of North America, but it rare to absent in southeastern states (K).. In Ky. there are three reported colls. from rocky woods in the central Bluegrass: FRAN at APSC; MERC at KY; and perhaps by Bryant (1973) from ANDE but coll. lost; see also M. In addition, there is an 1835 coll. by C.W. Short (at GH) from "sandy borders of the Ohio river in early spring".