Commonly known as Matted Tick-trefoil or Sand Tick-trefoil. They're tiny and you can miss them if you're not looking for them this time of year. Their little seed pods will stick to your socks and your pants if you walk through them. More info here - http://namethatplant.net/plantdetail.shtml?plant=3919
@wakelys Thanks, Susan!
@joysabin Thank you! They are in the pea family of plants. =)
@koalagardens They are pretty hearty little things. =)
@kjarn Thank you, Kathy!
@kvphoto Thank you very much, KV!