This grass is slowly taking over my yard, and it's highly irritating as it grows at 3-5 times the speed of the rest of the lawn. I'd dearly love to get rid of it, but broadleaf weed killer is not effective and pulling several hundred if not thousands of them is less than ideal. What is it, and can I kill it without killing the surrounding lawn? It has broad leaves that grow off a circular red stem with a red base. It also has a very thick root that I believe hosts several shoots. Most blades I pull pop off with a dozen or so short thin roots, but after I pulled a couple out that had much thicker woodier roots I realized I wasn't going to do much good by pulling alone.
What is this, and how can I get rid of it?
An example of the plant:
And an example of the root: