Mapping here is provisional. Some colls. of this largely Appalachian species are not easily distinguished from pulverulenta or lasioneura, or need to be rechecked. See notes under those segregates. Although these three taxa have been treated as species in several treaments, doubts linger and Cr treated them as varieties. While ranges are different, there is considerable overlap, and habitats are similar; 2n = 26 in all reports.