its definitely not centipede, i have plenty of that. this stuff will get bushy and tall like bermuda.
at the very top of the picture you can see a runner of Alicia bermuda to compare it with. this stuff is stalkier, and 2 or 3 times bigger. it kind of reminds me of tift 85 but i dont have any of that (of course whatever it is just showed up-) and i dont think its that though, ive seen it and this seems bigger (stalkier). the seed head isnt like a bermuda at all?
if it is a crabgrass it is unlike any i know of. it grows all of the growing season and comes back from the root and spreads like wildfire from the root. the cows seldom let it seed.
whatever it is, it is welcome here. i am setting it out in all the wet spots that are too soggy for bermuda and all the washouts. it absolutely loves muddy clay! and does well in the sand too.