Rubus jacens is a rare species of flowering plant in the rose family. It is native to eastern Canada (Ontario, Québec, Nova Scotia) and the north-eastern United States (New Hampshire, Vermont, New York, Pennsylvania).Biota of North America Program 2014 county distribution mapBlanchard, William Henry 1906. Torreya 6(7): 147–148
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. jacens may have originated as a hybrid between R. setosus and R. hispidus.Flora of North America, Rubus setosus Bigelow, 1824. Bristly blackberry, ronce sétuleuse
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