Mountain Arnica (Arnica montana) blooms between May and August, depending on the levels of vegetation. It is a perennial plant 7.8 to 15.7 in (20 to 40 cm) of pale green color recognizable by its oval leaves in rosettes and its floral stalk with large yellow-orange flower heads 2.3 to 3.1 in (6 to 8 cm), solitary or in groups of three or four. Pollinated by insects, Mountain Arnica gives off a strong characteristic aromatic odor. It is used in traditional medicine in the treatment of small traumas such as hematomas, although this use is not supported by scientific studies.