A hairy perennial comfrey, Symphytumx uplandicum (also called S. peregrinum), which is a natural hybrid of S. officinale and S. asperum and is widely naturalized in western and northern Europe.
Origin
Late 19th century.
Definition of Russian comfrey in US English:
Russian comfrey
noun
A hairy perennial comfrey, Symphytumx uplandicum (also called S. peregrinum), which is a natural hybrid of S. officinale and S. asperum and is widely naturalized in western and northern Europe.