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Rubus aculifer : ウィキペディア英語版 | Rubus aculifer
''Rubus aculifer'', the thorny dewberry, is a rare North American species of flowering plant in the rose family. It has been found only in the state of New Hampshire in the northeastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Fernald, Merritt Lyndon. 1940. Rhodora 42(500): 287–288 ) description in Latin, commentary in English〕〔(Fernald, Merritt Lyndon. 1940. Rhodora 42(500): plates 610 + 611 ) 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. aculifer'' may have originated as a hybrid between ''R. allegheniensis'' and ''R. setosus.''〔(Flora of North America, ''Rubus allegheniensis'' Porter, 1896. Allegheny or common blackberry, sow-teat berry, ronce des Alléghanys )〕 ==References==
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