Weeds of ACT and NSW ST's Journal

Advice from @jackiemiles: According to iNaturalist South Africa, even in its area of origin, Dimorphotheca plants are often hybrids. And unlike Gazania, where the hybrids have been given a name (Gazania x splendens) there is no accepted name for Dimorphotheca hybrids, so best just left at genus, and not Dimorphotheca ecklonis or D.fruiticosa.
https://inaturalist.ala.org.au/observations/246123056

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