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1 Awn of the lemma (4.5-) 7.4-12 mm long; inflorescence branches with spikelets distributed from the tip nearly to the base; leaves 5-15 mm wide; [widespread in our area, including the inland provinces]
1 Awn of the lemma (0.3-) 0.8-2.2 (-3.5) mm long; inflorescence branches with spikelets distributed either from the tip nearly to the base (G. chapmanianus) or to roughly the midpoint, the basal portion naked (or some branches rarely with a few spikelets) (G. brevifolius); leaves 2-8 mm wide; [Coastal Plain and only rarely the inland provinces].
..2 Spikelets 1-flowered, 3-3.5 mm long; first glume 2.3-3.7 mm long