Gentian

It is excellent good as Galen saith, when there is need of attenuating, purging, cleansing, and removing of obstructions, which quality it taketh of his extreme bitterness.

It is reported to be good for those that are troubled with cramps and convulsions; for such as are burst, or have fallen from some high place: for such as have evil livers and bad stomachs. It is put into Counterpoisons....

The root of Gentian given in powder the quantity of a dram, with a little pepper and herb Grace mixed therewith, is profitable for them that are bitten or stung with any manner of venomous beast or mad dog: or for any that hath taken poison.

Gerard, p. 434.

Weinmann, N 534. Courtesy of the Missouri Botanical Garden.