(Australia) A weed of species .
1901, South Australian Department of Agriculture, South Australian Department of Industry, Journal of Agriculture and Industry of South Australia, Volume 4, [http://books.google.com.au/books?id=HMtGAAAAYAAJ&q=%22three-cornered+jack%22|%2…
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A seed vessel of this plant, which has three symmetrically arranged thorns and a pointed head.
: The “Three-cornered jack/Devils thorn” () is believed to be poisonous to them, as many dead locusts are found near to each plant.
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