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Rubus tardatus : ウィキペディア英語版 | Rubus tardatus
''Rubus tardatus''is a rare North American species of flowering plant in the rose family. It is native to eastern and central Canada (Québec, Ontario, Nova Scotia) and the northeastern and north-central United States (Maine, Vermont, Michigan, Pennsylvania).〔(Biota of North America Program 2014 county distribution map )〕〔(Blanchard, William Henry 1906. Rhodora 8(95): 214–215 )〕 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. tardatus'' 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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