in taxon blackberry plant elmleaf blackberry plant PLANTS:RUUL Rubus ulmifolius is a species of wild blackberry known by the English common name elmleaf blackberry or thornless blackberry and the Spanish common name zarzamora. It is native to Europe and North Africa, and it is widely known elsewhere as an introduced species and sometimes a noxious weed. It is a brambly shrub with compound leaves and small, white or pink flowers. The fruit is a blackberry. rubus ulmifolius thornless blackberry zarzamora Rubus ulmifolius requires discussion