https://canberra.naturemapr.org/users/22862, apart from plantings by birds there were all kind of plantings by human/s in this area (they had protective guards) between the backyards and the Casuarina trail including non local she-oak, Cootamundra wattle and Red-stemmed wattle, A. rubida. I'm unable to id from your pic. Perhaps A. rubida?
Hi @MichaelMulvaney, interesting note on this population. It is all gone (dead) bar 2-3 plants in 1 location. Would be interesting to know if anyone has been monitoring them? Upcoming prescribed burn will be interesting to see if any seed has remained around the dead plants.