Galt Reserve, Pine Island, Florida

By the seed stalks, it's not a grass. Most likely a Carex sp.

I agree. The smaller stuff looks like a sedge too.

Yes, definitely a sedge. (I finally rememberd the term)

Yes, it looks like a type of Sedge (Carex species) and there are many types found here in Fla. I don't know which yours might be but if you can't find an exact ID, you can upload your photo to the general database entry here: Sedges (Carex)