Arnica montana flower extract is derived from the flower heads of the arnica montana plant, also known as wolf's bane or mountain arnica. This bright yellow flowering plant is used as herbal medicine to treat wounds, bruises, and inflammation.
In skincare products, however, it is mostly added for fragrance purposes due to its pleasant pine and sage odor. Some people may be sensitive to this extract.
Science
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Kriplani, P., Guarve, K., & Baghael, U. S. (2017). Arnica montana L . - a plant of healing: review. Journal of Pharmacy and Pharmacology, 69(8), 925–945. doi:10.1111/jphp.12724