Twitchell said:

I have another one with yellow flowers:

http://imgplace.com/image/view/be83f...78af20ed9c7a0c

It's driving me nuts as it can't be called 'broadleaf'. Any ideas?

It looks like rather wilted black medic. Or maybe hop clover. (I think I
can see some rolled leaves at various places in the photo.) It can creep
through the grass under mower height.

Anyway, that's my best guess. I used to have some in my lawn, which
I hand-pulled. This involved finding the sprouting point and unweaving
long runners from the grass.

Still invades occasionally from the neighbor's lawn.

(He mows too short, with a dull blade, and cuts off too much at once,
giving a dramatic illustration of how the most important part of of lawn
maintainence is proper mowing.)

--
Pat in Plymouth MI ('someplace.net' is comcast)

After enlightenment, the laundry.