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..2 Keel of the fertile lemma pubescent; [natives and exotics].
......4 Spikelets 1.5-2.5 mm long; lowest lemma in each spikelet mucronate.
........5 Lowest lemma in each spikelet tawny to reddish-brown; lateral veins of the lowest lemma in each spikelet with spreading hairs > 0.5 mm long; [rare introduction]
........5 Lowest lemma in each spikelet dark brown; lateral veins of the lowest lemma in each spikelet with appressed hairs < 0.5 mm long; [common native from NC south to s. FL, west to LA and beyond our area]