Prickly comfrey

Symphytum asperum is a flowering plant in the genus Symphytum, part of the Boraginaceae family. It is commonly called prickly comfrey and is the tallest species in its genus. The plant is native to Asia but has been introduced to regions such as Europe and North America. In these areas, it is occasionally regarded as a weed. It was first described in 1805 by Lepech. The species is found in parts of Canada, the United States, and several European countries, including Belgium, France, the Netherlands, and Italy.