Silphium. Silphium laciniatum L. Polar Plant. (Fam. Compositae.)—The rosin weed, or compass plant, of Ohio, yields an oleoresin, which is said to be used in making chewing gum. (A. J. P., 1881, 487.)

The Dispensatory of the United States of America, 1918, was edited by Joseph P. Remington, Horatio C. Wood and others.