ironbark tree

from The Collaborative International Dictionary of English v.0.48

Ironbark \I"ron*bark`\, Ironbark tree \I"ron*bark` tree`\ (Bot.)
   The Australian {Eucalyptus Sideroxylon}, used largely by
   carpenters and shipbuilders; -- called also {ironwood}. Also
   applied to other Australian eucalyptuses with a hard, solid
   bark
   [1913 Webster +PJC]