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Rubus centralis : ウィキペディア英語版 | Rubus centralis
''Rubus centralis'', the Illinois dewberry, is a rare North American species of flowering plant in the rose family. It has been found only in the east-central United States (Indiana, Pennsylvania, Michigan, Oklahoma, Pennsylvania).〔(【引用サイトリンク】title= Biota of North America Program 2014 county distribution map )〕〔Bailey, Liberty Hyde. 1932. Gentes Herbarum; Occasional Papers on the Kinds of Plants 22(6): 330–331〕 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.〔(【引用サイトリンク】title=Flora of North America, ''Rubus'' Linnaeus, 1754. Bramble )〕 ==References==
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