293. CHAPARRO AMARGOSO.—Castela Nicholsoni Hook. AMARGOSA. Bark of root. West Indies and along the Rio Grande in Mexico and Texas. Preparation: Fluidextract. Properties: Tonic, antiperiodic, astringent. Uses: Considered a specific for diarrhea. Dose: 30 to 60 minims. In pieces about ten inches long by one in width and a quarter in thickness. Outer portion composed of a corky layer 1/24 inch thick and ash-gray in color. Inner side of a dirty yellowish color, slightly striated. Fracture brittle but fibrous. Slightly aromatic. Very bitter.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.