Ah, 3 corner jacks, or Calthrop. The bane of my life growing up in the mid north of South Australia, and forever fixing punctured bike tyres.
Spotted some near the railway tracks in another town I lived in later (presumably the seeds hitched a lift), and the local council were very grateful to catch it before it got to seed.
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Ah, 3 corner jacks, or Calthrop. The bane of my life growing up...
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