Horse tail:

There are two kinds of this plant, both belong to the Equistáceas
family. The first is Equisetum bogotense H. B. K. And the other is
Equisetum giganteum L. Using the stem of the first one decocted, it
will act as a diuretic and anti blenorragic, and using the second
kind it will act as diuretic and astringent.