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Rubus frondosus : ウィキペディア英語版 | Rubus frondosus
''Rubus frondosus'' is a North American species of flowering plant in the rose family. It has been found in Ontario and in the eastern and central United States from Maine south to Georgia and west as far as Oklahoma, Nebraska, and Minnesota.〔(Biota of North America Program 2014 county distribution map )〕 Common name is leafy-bracted blackberry.〔(Rydberg, Per Axel 1901. in Britton, Nathaniel Lord, Manual of the Flora of the northern States and Canada 497 )〕 ''Rubus frondosus'' has pinnately compound leaves with 3 or 5 leaflets. Flowers are white. Fruits are black.〔Fernald, M. 1950. Gray's Manual of Botany (ed. 8) i–lxiv, 1–1632. American Book Co., New York〕 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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