Hakea decurrens and Hakea sericea are look-a-likes that are often misidentified. Arthur Chapman @arthur_chapman has provided a very useful guide to their identification: https://drive.google.com/file/d/1367CE1j6kS6J4Obqsr5fDdgz2yW9-xgA/view?usp=drivesdk
The main invasive blackberry species in SE Australia have been lumped together under a new scientific name, Rubus grabowskii
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:737099-1
This includes species that were formally difficult to seperate with photos alone:
Rubus fruticosus subspecies
Rubus fruticosus varieties
Rubus anglocandicans
This key from the NSW Herbarium shows that close up photos of the leaf upper and lower surfaces and the width of the leaf is important for correct id of firethorns:
https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Pyracantha
