Hyssopus. Hyssopus officinalis L. Hyssop. Hysope, Fr. Isop, Ysop, G.—This is a European labiate plant, found along roadsides in this country, whose flowering summits and leaves have been used in medicine. They have an agreeable aromatic odor, and a warm, pungent, bitterish taste, due to the presence of a volatile oil. This oil is colorless or greenish-yellow, of peculiar odor, sharp camphor-like taste, and neutral reaction. It has a sp. gr. from 0.88 to 0.98, distils between 142° and 162° 0. (287.6°-323.60 F.), and is soluble in its own bulk of alcohol of 0.85 sp. gr. The acid found in the oil has been identified as l-pinonic acid, and the ketone l-pinocamphene. Hyssop is a warm, gently stimulant aromatic, applicable to the same cases as the other labiate plants.
The Dispensatory of the United States of America, 1918, was edited by Joseph P. Remington, Horatio C. Wood and others.