Wildflowers in a National Park near Bundanoon, on the NSW southern highlands. They would have been some 15-20mm across. I'm fairly sure they are native to the area, though I've been unable to find an identification. UPDATE: It seems these may well be among the 50 or so species making up the Philotheca genus of native Australian plants. It seems they're difficult to grow in gardens so that may account for the relatively sparse information.