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Rubus tholiformis : ウィキペディア英語版 | Rubus tholiformis
''Rubus tholiformis''is a rare North American species of flowering plant in the rose family. It has been found only in eastern Canada (Québec and Nova Scotia) and the northeastern United States (Maine, New Hampshire, Vermont).〔(Biota of North America Program 2014 county distribution map )〕〔(Merritt Lyndon. 1940. Rhodora 42(500): 283–284 ) description in Latin, commentary in English〕〔(Fernald, Merritt Lyndon. 1940. Rhodora 42(500): plates 606 + 607 ) photos of ''Rubus aculifer''〕 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 )〕 Some studies have suggested that ''R. tholiformis'' may have originated as a hybrid between ''R. setosus'' and ''R. hispidus.''〔(Flora of North America, ''Rubus setosus'' Bigelow, 1824. Bristly blackberry, ronce sétuleuse )〕 ==References==
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