Most likely
Polygonum arenastrum otherwise known as knotweed! Tiny white/green axillary flowers, papery leaf sheaths and dense prostrate growth. I actually just identified this in my area this week so I am not as familiar with it....yet.
Plants for a future has this to say about knotweed.
As far as I can tell it is an incredible ground cover for compacted areas. It grows at my parents house in the high traffic dog yard and on a steep slope to boot. I think it could be a good plant to incorporate into some designs.
Thanks for all of your great plant ID posts! Just so happens that most of the species you post coincide with the species blooming in my area so you're always helping me with identification.