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1 Glumes < 0.6 mm long, appearing as triangular scales
..2 Plants with rhizomes and stolons
....3 Lemma margins glabrous
......4 First glume 2.0-2.3 mm long
........5 Spikes 4-9; culms to 6 dm tall
........5 Spikes 6-13; culms to 12 dm tall