The species is described as a perennial and I think this is the same clump of plants reported November 2017, sighting 3387391. I also noticed a second clump about 5m further down the track. It was hot weather and by the next day all flowers had withered and the plants were essentially invisible entangled among the other grasses and shrubs. Shows the need or luck to be in the right place at the right time.
Thanks for the posting., great that you have two clumps of this vulnerable pea on your property. You are also likely to have quite a large seed bank in the vicinity of the patches - waiting for fire or another disturbance event