Rubus exsularis

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Rubus exsularis, commonly known as the fenceline dewberry, is a rare North American plant in the rose family. It grows in the northeastern and north-central United States, mainly along the Appalachian Mountains from New York to Kentucky, with a few isolated populations in southeastern Wisconsin. The genetics of the Rubus genus are very complex, so it’s hard to decide which groups should be treated as separate species. Many Rubus species have limited ranges, and more study is needed to clarify its classification.