I was going to put Caesalpinia gilliesii, but when I looked it up in our database this is what came up,with Caesalpinia gilliesii as a synonym. Most of what I find online show Erythrostemon gilliesii as the synonym.
Both the Catalogue of Life and The Plant List show Caesalpinia as the correct genus, with Erythrostemon gilliesii as a synonym. Erythrostemon gilliesii is not listed as an accepted name, only as a synonym of Caesalpinia gilliesii.