Xanthoxylum Carolinianum

from The Collaborative International Dictionary of English v.0.48

Prickly ash \Prickly ash\ (Bot.),
   1. A prickly shrub ({Xanthoxylum Americanum}) with yellowish
      flowers appearing with the leaves; also called {toothache
      tree}. All parts of the plant are pungent and aromatic.
      The southern species is {Xanthoxylum Carolinianum}.
      --Gray.
      [1913 Webster]

   2. (Bot.), {Hercules'-club}, also called the {Angelica tree}.
      [PJC]