A Plant genus of the Family Asteraceae. The dried Flower heads of Arnica montana are used externally as a counterirritant and tincture for sprains and Bruises, either as crude extract or in homeopathic dilution (Homeopathy). Arnica contains Volatile Oils (Oils, Volatile), arnicin, arnisterol, Flavonoids; Tannins; and resin. The common name of Wolf's Bane is similar to the common name for Aconitum.