Appearance
"Rubus pensilvanicus" is a prickly shrub up to 3 meters 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.The genetics of "Rubus" is extremely complex, making it difficult to separate the group into species. What some authors lump together as "R. pensilvanicus", other authors split into as many as 50 or 60 species.
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