Arnica spp. Asteraceae Family (sunflower)
I have personally harvested Arnica near Boulder & Durango Colorado at sub-alpine regions in the mountains. I gather the flowers and leaves to make medicinal linaments & oils for topical use and the flowers for flower essences, which can be used both topically and internally.
Arnica linaments and oils are indicated in red/purple bruising and inflammation due to sprains, strains, and traumatic injuries and are NOT indicated in open wounds. However, St. John's Wort, also in the Herbal Roots First Aid Kit can be used on open wounds/bruises.The homeopathic form of Arnica can be used internally for the same indications listed above and two companies I am familiar with are Boiron and Hylands homeopathic remedies, which can be purchased at your local, natural grocery store.