Multiflora rose
 Rosa multiflora 

 Introduced from Japan in 1886 as rootstock for cultivated roses, planting of multiflora rose was encouraged by the U.S. Soil Conservation Service beginning in the 1930's to curb soil erosion. The nursery industry also touted the shrub as a "living fence," to control livestock and create snow barriers along highways. It was promoted by wildlife managers as late as the 1960's as an excellent source of food and cover for wildlife. Due to its dense growing habits, it has become a serious problem in the eastern United States and occurs throughout the U.S. Multiflora rose has naturalized in most of the northeastern and midwestern United States.  
(Courtesy of Wisconsin Department of Natural Resources)