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Rubus severus : ウィキペディア英語版 | Rubus severus
''Rubus severus'' is an uncommon North American species of flowering plant in the rose family. It is found in eastern Canada (Nova Scotia) and the northeastern and north-central United States (Maine, Vermont, New Hampshire, Rhode Island).〔(Biota of North America Program 2014 county distribution map )〕〔(Fernald, Merritt Lyndon 1931. A new blackberry from New Hampshire. Rhodora 33(388): 102–104 ) description in Latin, commentary in English〕 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. severus'' may have originated as a hybrid between ''R. setosus'' and ''R. flagellaris. ''〔(Flora of North America, ''Rubus setosus'' Bigelow, 1824. Bristly blackberry, ronce sétuleuse )〕 ==References==
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