Calamus, an intense aromatic warming bitter, stimulates digestion, reduces gas and bloating, and is very helpful for gastric reflux. Calamus has a strong affinity for the throat, trachea, and voice. In Native American culture it is a remedy for singers, particularly for hoarseness from overuse. Calamus also increases concentration and brightness of the mind. Brooklyn poet, Walt Whitman, wrote over 30 poems on the theme of this remarkable plant.