Description
Arnica is a pretty composite, somewhat resembling an orange coneflower, that grows wild in many parts of America and Europe. Unlike coneflowers, it has opposite leaves. There are generally 10 to 14 rays on the flowers with two or three small teeth at their distal end. Leaves are sessile and shallowly toothed. Arnica mollis grows best above tree line, but there are other Arnica species found at lower elevations. Cross breeding is common among some Arnica species, so that intermediate characteristics are often found.

Science - We haven't found any scientific studies for this yet, if you know of any, please let us know!

Folklore
Arnica is said to help heal bruising and sprains, and is applied externally. Native Americans were supposed to have used a tea from the roots of this plant to relieve back pain, but other sources -- including the Dispensatory of the United States state that internal use of this herb is dangerous, and can even be fatal.

When used externally, the bitter arnican from the flowers or roots of this plant is supposed to increase blood flow to the affected area, without the heat other stimulating herbs produce.

Similar effects are claimed for other species, particularly Arnica montana and Arnica nudicaulis.

Common Sense - would dictate that this herb may be useful for bruises and sprains, when used externally as a tincture or oil extract. Massaged into sore muscles, in small quantities, it may help relieve the pain of an excessive workout. It should not be used internally, or on open wounds. Use caution (test a small amount and wait a while for signs of reaction) when applying to sensitive areas. Discontinue use if any redness occurs.