When I was in South Dakota I saw this grass in a couple of different locations. The heads on it reminded me of the feathers on an arrow. I tried to find it on the internet to see just what type it is but it was surprisingly difficult. I found it on a couple of sites that were not anything official where they called it "Flat Grass" and that may be it's name as it is a good description. I'm still trying to find an ID. I like the look of it a lot no matter what it is called.