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Rubus pernagaeus : ウィキペディア英語版 | Rubus pernagaeus
''Rubus pernagaeus'' is a rare North American species of flowering plant in the rose family. It has been found only in the State of Virginia in the eastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Fernald, Merritt Lyndon 1940. Rhodora 42(503): 454–455, plates 633–634 )〕 The name ''pernagaeus'' means "from the land of hams," in reference to the fact that the species was initially discovered near Smithfield, Virginia, after which "Smithfield ham" is named. The species has upright canes up to 70 cm (28 inches) tall with trifoliate leaves.〔 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 )〕 ==References==
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