Acacia nilotica

(from the article `grassland`) ...be considered true grassland. The Mitchell grasslands were once much purer until they were altered by heavy grazing of domestic stock; today, vast ... ...extensive areas of dense, unnatural scrubland. A similar process is occurring in the Mitchell grasslands in inland northeastern Australia, an area ......
Found on http://www.britannica.com/eb/a-z/a/9
No exact match found