Osha root. Ligusticum filicinum.
Osha Root.—This is the root of Ligusticum filicinum Wats. (Fam. Umbelliferae), a perennial herb indigenous in Utah and neighboring States and known as Colorado cough root. It is highly prized as an expectorant. H. Haupt found in it an acid, oshaic add, closely resembling angelic acid. (A. J. P., 1867, 1868, 1873.)