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Rubus sewardianus : ウィキペディア英語版 | Rubus sewardianus
''Rubus sewardianus'' is a rare North American species of brambles in the rose family. It has been found only in the State of Virginia in the eastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Fernald, Merritt Lyndon 1945. Rhodora 47(557): 154–156, plates 894–895 ) includes photos of type specimen at Harvard University Herbaria〕 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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