, the Persian manna or manna, whose name is derived from the Greek âÂÂbrachyâ meaning "short" and âÂÂcalyxâ meaning the sepal of a flower, is a species of legume commonly found on rocky mountain slopes in western Asia, from western Iran and northern Iraq to Turkey, and is commonly used as a source of gum tragacanth. The sweet honeydew of the plant lice secreted onto is an essential component of traditional gaz, the Persian form of nougat produced in Isfahan, Iran.