I've been curious about a weed grass in my and my neighbor's front lawn. Neither of us likes to mow, so there's lots of growth, especially crabgrass and what I think might be Broadleaf signalgrass, or Brachiaria platyphylla. I've attached two photos. I used the Virginia Tech weed ID guide to narrow it down. WIhat do you think?
This looks like crabgrass. http://extension.umd.edu/hgic/crabgrass