Thank you for the smaller pic, Ann. My temporary internet is data restricted so to make the most of the overpriced access we do have, I'm not downloading anything heavy.
After all that … wish I could say I recognise the plant. :-\
That weed is Egyptian Spinach. The leaves have a lovely taste. Stop spraying and start eating! (The flowers were the give away, and the serrated leaves.) I paid good money for those seeds!
Flowers if you've got them would be good.
Queensland Herbarium is option if you have trouble with identification.
Good suggestion Jeff.