This weed is growing lots of places around here. Common name is Chamber Bitter. It's very unusual and I've never noticed it before this year. It was those tiny balls all lined up that got my attention! Posted an overall view in my extras album. A non-native - from southeast Asia and found growing wild in the Carolinas and Georgia. More info here - http://namethatplant.net/plantdetail.shtml?plant=1071
@dutchothotmailcom Thanks, Esther! I think the tiny flowers change into those balls. LOL! The flowers are so tiny, difficult for my camera to zoom in that much. But you can see them on the link much better.