描述
Rubus ulmifolius, commonly called thornless blackberry or elmleaf blackberry, is a species of wild blackberry. It is native to the Netherlands, Spain, Portugal, Britain, Ireland and North Africa, and naturalized in USA, Australia, southern and western South America. The thornless blackberry is shrub that can grow up to 5 meters tall, sometimes with spines. The flowers are usually pink or white, the fruits are dark purple, almost black. [Wikipedia]