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Rubus prestonensis : ウィキペディア英語版 | Rubus prestonensis
''Rubus prestonensis'' a rare North American species of brambles in the rose family. It has been found only in the States of Ohio and West Virginia in the eastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔Davis, Hannibal Albert Davis, Tyreeca Stemple. 1953. Castanea 18(1): 18, 28–29〕 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 )〕 ==References==
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