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Rubus nigerrimus : ウィキペディア英語版 | Rubus nigerrimus
''Rubus nigerrimus'' is rare North American species of brambles in the rose family. It has been found only in the States of Oregon and Washington in the northeastern United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Piper, Charles Vancouver. 1897. Erythea 5(10): 103 ) ''Rubus hesperius'' 〕 ''Rubus nigerrimus'' is up to 2 meters (80 inches) tall, strongly armed with straight prickles. Leaves are compound with 3 or 5 leaflets. Flowers are white. Fruit almost black, with woolly hairs.〔(Rydberg, Per Axel 1913. North American Flora 22(5): 445 ) ''Rubus nigerrimus''〕 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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