I thought the leaves were thinner than some A. gunnii and did not show the typical leaf shape of A gunnii which I have seen before. However, when I was looking at various photos of A. siculiformis, this plant including leaves did not look like it. The leaves and stems are hairy like A. gunnii too. I also looked at some illustration on 2 different websites which show a few types of leaf shapes. Could you have a look at them? I thought this plant and the other plant sighting from today which I suggested as A gunnii can fit into this. http://worldwidewattle.com/speciesgallery/images/gunnii.jpg http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&showsyn=&dist=&constat=&lvl=sp&name=Acacia~gunnii
For comparison: A. siculiformis http://worldwidewattle.com/imagegallery/image.php?p=0&l=s&id=23826&o=1
I think this is one that needs to go the herbarium. If it is A. siculiformis it seems very atypical of this species locally in having long stipules and being very hairy. It may be a habitat thing as the other records seem much nearer to a water course then the now two records from this site.
Ken is right. Is there anyone from near Wanniassa Hill that has a collecting permit who can take a specimen, preferably pressed and dries, into the botanic gardens? Here are the diagnostics for Acacia gunnii http://worldwidewattle.com/imagegallery/image.php?p=0&l=g&id=20576&o=1 and Acacia siculiformis http://worldwidewattle.com/imagegallery/image.php?p=0&l=s&id=23826&o=1 On second thoughts, looking at the diagnostics again, I agree that it is Acacia gunnii.