[1] : The Collaborative International Dictionary of English v.0.48

poison bush \poison bush\ in australia:
      a any fabaceous shrub of the genus gastrolobium, the
          herbage of which is poisonous to stock; also, any
          species of several related genera, as oxylobium,
          gompholobium, etc.
      b the plant myoporum deserti, often distinguished as
          ellangowan poison bush or dogwood poison bush.
      c the ulmaceous plant trema cannabina, which, though
          not poisonous, is injurious to stock because of its
          large amount of fiber.
          webster 1913 suppl.
see also:
gastrolobium oxylobium gompholobium myoporum deserti ellangowan poison bush dogwood poison bush 
trema cannabina 

[2] : WordNet (r) 2.0

poison bush
     n 1: any of various australian evergreen shrubs of the genus
          gastrolobium having whorled compound leaves poisonous to
          livestock and showy yellow to deep reddish-orange
          flowers followed by two-seeded pods syn: poison pea,
          gastrolobium
     2: either of two australian plants of the genus swainsona that
        are poisonous to sheep syn: darling pea
see also:
poison pea gastrolobium darling pea 

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