Alisma. Alisma Plantago-aquatica, L. Water Plantain. Plantain d'eau. Pain de grenouilles, Fr. Froschlöffel, Wasserwegerich, G. (Fam. Alismaceae.)—A perennial herbaceous plant, common to Asia, Europe, and the United States. The root has, when fresh, an odor like that of Florentine orris, but loses it when dried. Its taste is acrid and nauseous. It contains a pungent volatile oil and an acrid resin, to which all its virtues must be ascribed. The Calmucks in Russia are said to use it for food. The leaves are rubefacient, and will sometimes even blister. They have been recommended in gravel and cystitis. Dose, a drachm (3.9 Gm.).