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.
- Biota of North America Program 2014 county distribution map
- Bailey, Liberty Hyde 1943. Gentes Herbarum; Occasional Papers on the Kinds of Plants 5(5): 412, 415, figure 188.
- Flora of North America, Rubus Linnaeus, 1754. Bramble
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