Symphytum asperum

Symphytum asperum is a flowering plant of the genus Symphytum in the family Boraginaceae. Common names include rough comfrey^[1] and prickly comfrey.^[2] It is the tallest Symphytum species.^[3] It is native to Asia, and it is known in Europe and North America as an introduced species and sometimes a weed. Symphytum × uplandicum, the naturally occurring hybrid with the common comfrey (Symphytum officinale), is the economically most important kind of comfrey.

Symphytum asperum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Boraginales
Family:	Boraginaceae
Genus:	Symphytum
Species:	S. asperum
Binomial name
Symphytum asperum Lepech.