I am trying to ID this grass for a resident in Anne Arundel Co., Arnold area. It is tightly spreading by rezone about 2inches long with a darker green color than the surrounding lawn.
In the third photo, it appears that the weed grass is a lighter, not darker, color than the fescue (which is only in the top left corner.)
At any rate, this looks like nimblewill. http://extension.umd.edu/hgic/nimblewill
Thanks for your assistance.