I believe it was a rye grain. It's not the grasss like you would plant in your yard. It has a much broader blade and looks more like oats or winter wheat than regular grass.
I bought a bag of Throw and Grow to put down there, too. Although I don't just throw. I rake out the soil with a hard rake and make sure the seeds have good soil contact. I lime in the spring and fall and fertilize in the early spring.