Essentially, along the edges of a new-to-me yard (edges of house, porch) -- I'm assuming from moisture retention -- a weedy/cloverish (I have no idea, clearly) thing is taking over.
This is a yard in North Texas / Fort Worth, if you're curious about environment.
Here is a picture of the grass/weed in question:
click image for full size
What is this stuff, and what is a good method if getting rid of it, while vitalizing the good grass?
Looking for ideas, or product + method recommendations.