Yaupon

Ilex vomitoria, yaupon or yaupon holly, is an evergreen holly native to the southeastern and south-central United States, Cuba and a population in Chiapas. The word comes from the Catawban yą́pą, "tree leaf". It is one of only two known North American plants that produce caffeine, and its leaves also contain theobromine and theophylline. Native tribes of the Southeast brewed the leaves and stems into a ceremonial drink called the black drink, taken in large volumes while fasting in purification ceremonies in which vomiting was part of the ritual. Early European observers misread this and named the plant vomitoria, though the plant itself is not emetic. Colonists made it into cassina, Carolina tea and Indian tea, and it is again sold as tea. The shrub is also a common landscape hedge plant.