I concur with Tiemco. The KBG and Tall Fescue grass blades can be easely seen on the pictures. Perennial Ryegrass looks a lot like KBG, but does not have the boat shape tip. Where in the US are you located? Tall Fescue/Bluegrass mixed lawns are very popular in the Transition zone.

Botanbill, while I appreciate, sincerely, your input, if you live on sugar sand dunes and he/she doesn't, things could be different. It sounds like you and the OP might be relative neighbors, but I've been here a loooong time. FL is one of those places where you can't assume anything about the soil in different parts of the state. Tampa is one of those places where if you guess, you're probably wrong. While I expect sand, there are a bazillion lakes and ponds around there. Those don't form on pure sand, so there's a strong possibility he/she has something else. jmandawg, Do you get puddles when it rains? Do you still water even if you get rain? That does seem like an excessive watering frequency. If you can get your grass roots retrained to grow deeper in the soil, I strongly suspect you can restrict your watering to once a week or even less often. But if you're on sugar sand, then botanicalbill is going to have more to say about it. When I backfilled my back yard I used what amounts to sugar sand. It's 8 inches deep at the deepest, which I realize your soil is probably 80 feet deep, but still - it's sand for the entire grass root zone. That sand grows the best grass I have. After 12 years of organics the sand is black when you look at it, but when you put it in a jar of water, all the white sand sinks immediately to the bottom and all the black organic stuff floats to the top. That grass gets watered once every other week unless it rains. So far this year it's only been watered by me twice. We got some heavy rains and it really hasn't needed more. jmandawg again, generally the world gets by watering deeply and infrequently. Generally that means watering one inch of water, all at one time, and doing it once a week when temps are in the 90s. Other factors to consider are soil type, soil depth, grass type, grass height (yours should be mowed at the mower's highest setting), shade, clouds, wind, humidity, organic content of the soil, and some others. After taking all this into consideration, there are only a few places where the general advice would differ. One of those places is the area from Green River, Utah south to the Mexican border and west to Indio, CA and east to Junction, TX. That area is different because the soil is often gravelly. The sand is coarse and really does not hold any water. If Florida is another location where the general guidance does not apply, I have not heard about it. But I am certainly willing to listen to actual experience of people who have tried to grow deep roots and still required frequent watering. I'm still interested in the soil conditions for jmandawg.

It is called nut grass. I spreads by little underground rhizome kinda things. I understand it is hard to get rid of. I have some in my yard as well. Mary z 5b KS

If you take those sprigs to three different local grass merchants you might get 3 different answers. ...or not. That's what I'd do. Out of curiosity, does it make a difference to you? I would suggest it is not Floratam. Floratam usually has purpleish stolons.