254. ARAROBA.—GOA POWDER. A mixture of neutral principles obtained from radial fissures in the wood of a Brazilian tree, Andi'ra araro'ba Aguiar. This powder is of a light yellow color, with a somewhat earthy appearance, turning dark brown or purplish on exposure; somewhat crystalline, rough, and mixed with pieces of wood-fiber; inodorous and very bitter. It consists chiefly of chrysarobin (Chrysarobinum). Used externally, in ointments, in skin diseases caused by fungi.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.