Horsetail

Genus & Species: Equisetum arvense
Common Names: Scouring Rush, Horse Pipes, Joint-grass, Bottle-brush
Overview: Horsetail is a non-flowering perennial and a close relative of the fern. Its native habitat includes parts of North America, Europe, Asia, and the Middle East. Horsetail’s medicinal use dates back to the times of ancient Greece and Rome, where it was valued for its ability to stop bleeding, heal ulcers and wounds, and to treat kidney diseases. Modern research has found horsetail to be a promising treatment for osteoporosis because of its ability to increase bone density. [1] Many of its medicinal qualities are due to the herb’s remarkable silica content. In fact, the herb contains so much silica that when it dries, crystals of this vital element form on the plant’s surface. [1,2] 
Therapeutic Properties: Immunostimulant, anti-inflammatory, astringent, anti-hemorrhagic, hemostatic, diuretic, vulnerary, anti-rheumatic, connective tissue tonic [2]
Typical Uses: Horsetail has a long history of being prepared as a decoction to treat ulcers, UTIs, kidney stones, and inflammation of the skin and inner organs. Because of its high content of silica and other minerals, horsetail decoction is also ideal for increasing bone density throughout the body. Alternatively, it can be infused into a carrier oil or liniment for topical application. With this method, horsetail acts as a powerful vulnerary and anti-inflammatory, helping to heal damaged skin and strengthen connective tissue. [3]

References: 

1. Horsetail | Milton S. Hershey Medical Center

2. Equisetum Arvense | The Naturopathic Herbalist

3. Horsetail Herb | American Botanical Council