Histochemistry of comfrey (Symphytum officinale)
De-Padua, L.S.; Pantastico, J.B.
Kalikasan 5(3): 351-356
S. officinale L., commonly known as comfrey and used extensively in the treatment of various ailments, was studied for its major chemical constituents. Found were alkaloids, tannins, amino acids and saponins. Alkaloids were more abundant in the roots than in other parts of the plant.