2nd photo: Photo of whole plant
Your 1st photo doesn't seem to have been attached but judging by this one it looks like a species of Spurgularia
Thanks John. Here's the 1st photo, but having checked the website for Spergularia, it does seem to be that.
I agree with John. you could try Spergularia rubra, it is common, and maybe in ephemeral wetlands.your top photo looks like this taxon. If it is saline then it could be one of the other species. you need seeds for a definitive id.
(JPG format, max 500kB)