A plant quiz is far from overdue.
The ability to identify grasses without fertile material is not for the faint of heart and is one of the most challenging (and ignored) aspects of floristic botany. Most species can readily be identified by their leaves, sheaths, ligules, stems, pubescence, habit and habitat. Familiarity is the key.
Since this is especially challenging, I'll add a new clue each day until someone gets it right. Good luck!