The dried tuberous roots of Exogonium Purga Bentham, yielding not less
than eight per cent of total resin, but not more than one and a half per
cent of the resin soluble in ether.
HABITAT.--Southern United States and Mexico.
PROPERTIES.--The root is dark brown, with numerous concentric circles
composed of small resin cells; fracture resinous, lustrous, not fibrous;
odor slight, but peculiar, smoky and sweetish; taste sweetish and acrid.
DOSE.--Pigs, 2 to 4 dr.; dogs, 1 to 2 dr.; cats, ¹⁄₂ to 1 dr.