Vachellia nilotica (weed)
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Vachellia nilotica (weed) (L.) P.J.H. Hurter & Mabb. - (prickly acacia)
The species is native to Africa and Asia (where it may be cultivated) and an invasive weed in pastures of Australia. It has infested millions of hectares of arid and semi arid parts of Queensland, where it suppresses grassland and interferes with livestock farming.
It is a small, thorny tree growing to a height of about 5 m. The pods are readily eaten by cattle and spread of the viable seeds through cattle (after passing the digestive tract) is probably the main mechanism of dispersal. Important control strategies include preventing further spread of the weed and eliminating it near waterways which can also promote its spread.
For details see the respective page in Wikipedia.