Rubus hypolasius is an uncommon North American species of flowering plant in the rose family. It grows in the east-central United States (New Jersey, Virginia).Biota of North America Program 2014 county distribution mapBailey, Liberty Hyde 1947. Gentes Herbarum; Occasional Papers on the Kinds of Plants 7(3): 275, 278, figure 101Merritt Lyndon. 1947. Rhodora 49(582): 145–146 description in Latin, commentary in EnglishMerritt Lyndon. 1947. Rhodora 49(582): plates 1064–1066 photos of herbarium specimens
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.Flora of North America, Rubus Linnaeus, 1754. Bramble Some studies have suggested that R. hypolasius may have originated as a hybrid between R. flagellaris and R. pensilvanicus. Flora of North America, Rubus pensilvanicus Poiret 1804. Pennsylvania blackberry, ronce de Pennsylvanie
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