Rubus concameratus

Rubus concameratus, the West Virginia blackberry, is a rare North American species of flowering plant in the rose family. It has been found only in the state of West Virginia in the east-central United States.
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.