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..2 Glumes with hairs < 1.0 mm long on the keel, merely scabrous toward the tip
..2 Glumes with hairs 1.0-1.5 mm long on the keel, including toward the tip
....3 Awn about as long as the glumes (at most exceeding the glumes by 1 mm)
......4 Anthers 0.4-0.7 mm long; annual
......4 Anthers 1.3-2 mm long; perennial