INDIAN HOREHOUND; a genus of the monogynia order, belonging to the diandria class of plants. The most remarkable species is the zeylanica, a native of the East Indies. It rises with an herbaceous, four-cornered, hoary stalk; and bears leaves that are entire, nearly heart-shaped, woolly, deeply notched on the edges, and having foot-stalks. The flowers, which are purplish and fragrant, surround the stalk in whorls, each whorl containing about 14 flowers; and are succeeded by four small kidney-shaped shining seeds, lodged in the bottom of the permanent flower-cup. The Indians superstitiously believe that a fumigation of this plant is effectual for driving away the devil, and from this imaginary property its name in the Ceylonese language is derived. Grimmius relates, in his Laboratorium Ceylonicum, that for taste and smell this species of horehound stands remarkably distinguished. A water and fumile oil are obtained from it, both of which are greatly commended in obstructions of the matrix. A syrup is likewise prepared from this plant, which is useful in the above-mentioned disorders as well as in diseases of the stomach.