Species of fruit and plant
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Rubus russeus is a rare North American species of brambles in the rose family. It has been found in eastern Canada (New Brunswick and Nova Scotia) and in the northeastern United States (Pennsylvania and West Virginia).
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.
References.
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