Does this help?
AKA rattlesnake grass. It's all over South Georgia. I eat the tubers in the spring. Any other time of year they are a little too earthy tasting for me. They taste like a radish.
Good luck on getting rid of it. You'll need to follow some sort of scorch and burn program. I gave upon chemical control years ago (Decades actually). I just dig it up along with all those white white runners it shoots out.
In a lawn all I've ever done is to mow a little more often.
Check with your county agent to see what's new in chemical control for your area. Don't try to cut corners when trying to control it. Follow label instructions or just take half of what the chemical cost and throw it in a fire, you'll come out ahead.