I went out very early this morning to the local bamboo grove, and saw this flower. I posted it already on dpc, and got the answer that it's probably some kind of jack-in-the-pulpit. I thought, a pitcher plant. Quite poisonous, apparently, especially the roots. Although you can't see it in this photo, the long stringy tendril that sticks up, turns back on itself and curls around. I'm not sure if we have this kind of plant in Australia.