Probably A nervosus, but could also be A. neesii. Just depends on whether 1) the awn arises near the lemma tip (from top 30% of lemma length) and the lemma apex appears constricted - A. neesii or 2) the awn arises further down from the lemma tip (from top 40-50% of lemma length) and the lemma apex does not appear constricted