Horsetail or Shavegrass
Today's Herbal Health by Louise Tenney 2nd Edition says:

Horsetail or Shavegrass
(Equisetum Arvense)
Parts used: The Herb

Used in urinary tract disorders, especially lower tract infections. Aids in coagulation 
and helps decrease bleeding. The most important ingredient is silicic acid which helps 
aid circulation. Research has shown fractured bone s will heal much faster when 
horsetail is taken. Decoction applied externally  will stop bleeding of wounds and heal 
them. Bathing in the herb accelerates circulation thruogh the skin and makes them 
especially effective for circul ation problems. swelling of broken bones, chillblains. 
Also pain of rheumatism an d gout is relieved. It is rich in silicon and selenium. It 
contains vitamine E, pantothenic aci d, PABA, copper, manganese, some sodium, cobalt, 
iron, and iodine.

Use for:
BLADDER PROBLEMS
BLEEDING, INTERNAL
CIRCULATION PROBLEMS
Dropsy
F   eevers
GLANDULAR DISORDERS
Kidney problems
Liver, overactive
Menstruation, excessive
NAILS, BRITTLE
Nervous tension
NOSE BLEEDS
Skin rashes
Tuberculosis, pulmonary
URINARY ULCERS
URINATION, SUPRESSED

Hope this helps.
Joyce