Hi, We were wondering if you could help us identify this weed. This year my family noticed a new kind of weed growing in our yard this summer. It's very easy to pull out of the ground by hand, and takes over very large patches of grass. In the photo, it's being compared to a quarter.
This looks like Japanese stiltgrass, an invasive weed. See our website for more information http://extension.umd.edu/hgic/problems/japanese-stiltgrass