This occurs mostly in Appalachian regions, but extends west to the non-calcareous parts of the Interior Low Plateaus and to Ozarkian regions (FNA 23, K). In Ky. it is generally restricted to acid gravelly or sandy soils along scoured banks of small to medium-sized streams. The disjunct coll. from BOON (DOV) was made by R. Naczi (#8021) at the same location as prasina, in a seep along Gunpowder Creek.