Comfrey (Symphytum officinale) is a perennial flowering plant of the genus Symphytum in the family Boraginaceae. Along with several other species of Symphytum, it is commonly known as comfrey. To differentiate it from other comfreys, this species may be known as common comfrey, Quaker comfrey, and cultivated comfrey. Other common names include boneset, knitbone, consound, and slippery-root. It is native to Europe and it is known elsewhere, including North America, as an introduced species and sometimes a weed.