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Rubus lawrencei : ウィキペディア英語版 | Rubus lawrencei
''Rubus lawrencei'' is an uncommon North American species of brambles in the rose family. It grows in the northeastern United States (New York, Vermont, Pennsylvania, Rhode Island, and Maine). Nowhere is it very common.〔(Biota of North America Program 2014 county distribution map )〕〔Bailey, Liberty Hyde 1941. Gentes Herbarum; Occasional Papers on the Kinds of Plants 5(3): 145–146, figure 54〕 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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