Mezcal bean grows as a small tree or large shrub in the southwestern United States.
Its common name is associated with its traditional use as a hallucinogen for divining spirits. Native Americans in the Southwest would roast one seed, cut it in quarters, and eat it. This would lead to a hallucinogenic state that would last for several days.
Like most hallucinogenic plants, mezcal bean is extremely toxic. It contains an alkaloid that attacks the liver and even one seed can be deadly.