Xanthoxylum

Xanthoxylum, a genus of the Rutaceæ, comprising over one hundred species, of which many are found in Brazil and the West Indies. Of five found in the United States the best known is the Prickly Ash or Toothache Tree (X. fraxineum), the bark and its extracts being used for toothache and rheumatism, and also as a tonic. Some species are called Fustic, Pepper, Yellow-wood, &c.