Thanks for your suggestion. We have no known records of Erodium robertianum locally. Just looking at the ALA - it is not on their species list: https://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2919609#classification I will leave it to our botanists to discuss.
Sorry Michael, that should have been "Geranium" robertianum! The most similar species is G. lucidum which is distinguished by the leaf and flowers again.