This is widespread in northern and western regions, especially on calcareous soils. It has been reported from all surrounding states (PL), including nearby counties in Ohio and W.Va., but there are only a few tentative reports of colls. from Ky. (M). Colls. filed under atlantica (or howei) should be reexamined for possible records. The more northern, circumboreal relative C. echinata Murray (= C. angustior Dewey) might also be expected, since it extends south along the Blue Ridge to Tenn. and N.C. in boggy places (Ch, W).