American Wintergreen, or Gaultheria procumbens, is a perennial, evergreen shrub native to North America from Alabama to Manitoba. It is also known as teaberry, boxberry, mountain tea, and wintergreen. It is used both in an essential oil and tea form, made from fresh leaves. American Wintergreen contains high quantities of methyl salicylate, a naturally occurring chemical similar to aspirin. Oil of Wintergreen, or wintergreen essential oil, contains up to 98% methyl salicylate. Learn more about Wintergreen oil and tea!