http://www.rainbird.com/roseparade/funfacts.htm
It seems like the grass is Phragmites. I am not clear whether the name was mispelled or the grower has a pet name for it. Richard Raberler's comment is pertienent:
Since I see that "niger" seed is spelled a bit creatively ("Nyjer"), I wonder if this is really "phragmites".
Mary