MickyB wrote:Looks like Onion Weed (Asphodelus fistulosus)
Thanks for educating me, MickyB. I feel like deleting my post as a consequence!
But the paradox is that I thought it looked very pretty. There's an interesting line in this document: http://vro.agriculture.vic.gov.au/dpi/vro/vrosite.nsf/pages/impact_onion_weed
"During flowering, dense patches would create a major effect to aesthetics." Yeah, in my ignorance, I thought it was a positive effect!
I've walked in this area quite a bit and not seen this plant previously. This spring's weather has encouraged lots of growth of various kinds and the Mallee region in particular looks quite lush. So I really should not be surprised that weeds are thriving in the bush, just like they are in my suburban garden.