Collinsonia. Collinsonia canadensis L. Horse-weed. Horse-balm. Richweed. Heal-all. Stone-root. Knot-root. Knot-weed. Guerit-tout, Baume de Cheval, Fr. Collinsonie, G.—A labiate plant, which grows in woods from Canada to the Carolinas. The whole plant has a strong disagreeable odor, and a warm pungent taste. C. N. Lochman (A. J. P., 1885, 228) found in the root a resin, tannin, starch, mucilage, and wax; in the leaves resin, tannin, wax, and volatile oil. The alkaloid discovered by H. J. Lohmann in the root of the Collinsonia canadensis appears to have been a magnesium salt. (See D. C., 1902.) Collinsonia is tonic, astringent, diaphoretic, and diuretic. It is said to be locally irritant. A decoction of the fresh root has been used in catarrh of the bladder, leucorrhea, gravel, and dropsy.