prickly ash

either of two North American shrubs or trees (genus Zanthoxylum) of the rue family, with pinnately compound leaves having paired spines at the base

See prickly ash in American Heritage Dictionary 4

noun
  1. Any of numerous cosmopolitan, deciduous or evergreen shrubs or trees of the genus Zanthoxylum, having aromatic bark and alternate, mostly pinnate leaves.
  2. See Hercules' club.
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