Rubus baileyanus

Rubus baileyanus, common name Bailey's dewberry, is an uncommon North American species of flowering plant in the rose family. It is found in scattered locations in central Canada and in the eastern and north-central United States, primarily in the Appalachian Mountains. Its range extends from Massachusetts, Ontario, and Minnesota south as far as Missouri, Tennessee, and North Carolina, though it is not common in any of those places.
The genetics of "Rubus" is extremely complex, so that it is difficult to decide on which groups should be recognized as species. There are many rare species with limited ranges such as this. Further study is suggested to clarify the taxonomy.