xanthoxylum americanum

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]

from The Collaborative International Dictionary of English v.0.48

Xanthoxylum \Xan*thox"y*lum\, n. [NL., from Gr. xanqo`s yellow +
   xy`lon wood.] (Bot.)
   A genus of prickly shrubs or small trees, the bark and rots
   of which are of a deep yellow color; prickly ash.
   [1913 Webster]

   Note: The commonest species in the Northern United States is
         {Xanthoxylum Americanum}. See {Prickly ash}, under
         {Prickly}.
         [1913 Webster]

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