This plant doesn't look like anything else on the grassy plains. In fact it almost looks like it doesn't belong. The big fleshy leaves and bright in-your-face pink flowers are unmistakable. It's Inland Pigface Carpobrotus modestus, seen growing here beside a little creek near Bannockburn today. Cotula coronopifolia, the yellow water buttons that 'they' took a long time to decide was not an Aussie plant but South African only, is also putting on a show.
Pigface is edible, but I think they should find a nicer common name to make it more palatable.