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Rubus rydbergianus : ウィキペディア英語版 | Rubus rydbergianus
''Rubus rydbergianus'' is a rare North American species of brambles in the rose family. It has been found only in Westchester County in the State of New York in the northeastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔Bailey, Liberty Hyde 1945. Gentes Herbarum; Occasional Papers on the Kinds of Plants 5(9): 745, 748, figrue 339〕 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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