Horse Tail

Equisetum arvense

Habitat: Tall Grass Prairie

Seasons: Spring to Fall

Active Chemical Ingredient

Kaempferol

https://en.wikipedia.org/wiki/Kaempferol

Use of specimen: Applied directly to the skin in the form of a poultice to help disinfect open wounds 

Source: http://www.webmd.com/vitamins-supplements/ingredientmono-843-horsetail.aspx?activeingredientid=843&activeingredientname=horsetail