_Indian Physic._ _Radix._
[This plant abounds in the woods of hills and mountains, in every part
of the United States. The root, which is the part used in medicine, is
of a bitter taste, and yields by analysis extractive matter and resin.
In its medicinal properties the Spiræa resembles the ipecacuanha of the
shops. The full dose in powder is 30 grs.]