Comfrey n. (Bot.) A rough, hairy, perennial plant of several species, of the genus Symphytum. Note: A decoction of the mucilaginous root of the "common comfrey" (Symphytum officinale) is used in cough mixtures, etc.; and the gigantic "prickly comfrey" (Symphytum asperrimum) is somewhat cultivated as a forage plant.
... Lungs. Herb Tea for.—"Two ounces each of bistory root, tormentil root, oak bark, and comfrey root, boil in three quarts of water down to one pint, strain and add one tablespoonful of ground ginger. Give a wine glass full every half hour until relieved. Place the feet in hot mustard water, keep the bowels open with a little senna and ... — Mother's Remedies - Over One Thousand Tried and Tested Remedies from Mothers - of the United States and Canada • T. J. Ritter