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Rubus biformispinus : ウィキペディア英語版 | Rubus biformispinus
''Rubus biformispinus'', the pasture dewberry, is an uncommon North American species of flowering plant in the rose family. It is found in eastern and central Canada (from Ontario to Nova Scotia) and the northeastern United States (Maine, New York, Pennsylvania).〔(Biota of North America Program 2014 county distribution map )〕〔(Blanchard, William Henry. 1906. Rhodora 8(93): 178–179 )〕〔(The Plant List, ''Rubus biformispinus'' Blanch. )〕 The epithet ''biformispinus'' means "with spines of two shapes," referring to the two distinct sizes of prickles on the stems.〔 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. biformispinus'' 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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