The Collaborative International Dictionary of English v.0.48:

fire-tree \fire-tree\ n.
   a terrestrial evergreen shrub or small tree (Nuytsia
   floribunda) of West Australia having brilliant yellow-orange
   flowers; parasitic on roots of grasses.

   Syn: flame tree, flame-tree, Christmas tree, Nuytsia
        floribunda.
        [WordNet 1.5]