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''Rubus pensilvanicus'', known commonly as Pennsylvania Blackberry, is a prickly bramble native to eastern and central North America from Newfoundland south to Georgia, west as far as Ontario, Minnesota, Nebraska, and Arkansas. The species is also established as a naturalized plant in California.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Rubus pensilvanicus'' Poiret, Pennsylvania blackberry )〕 ''Rubus pensilvanicus'' is a prickly shrub up to 3 meters (10 feet) tall. The canes are green at first but then turn dark red, usually ridged, with copious straight prickles. The leaves are palmately compound, usually bearing 5 or 7 leaflets. The flowers are white with large petals, borne in mid-spring. The fruits are large aggregates of 10-100 black drupelets, somewhat sweet and often used for jams and jellies.〔(Flora of North America, ''Rubus pensilvanicus'' Poiret 1804. Pennsylvania blackberry, ronce de Pennsylvanie )〕 The genetics of ''Rubus'' is extremely complex, making it difficulty to separate the group into species. What some authors group together as ''R. pensilvanicus'' other authors split into as many as 50 or 60 species.〔 ==References== ==External links== *(Jepson Manual Treatment ) *(Illinois Wildflowers ) *(Go Botany, New England Wildlife Society ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rubus pensilvanicus」の詳細全文を読む スポンサード リンク
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