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1 Perennial from a horizontal rhizome; central flower (of each group of 3) slightly or not at all longer than the 2 lateral flowers; [subgenus Amerocornia]
..2 Scale-leaves below the spikes mucronate; spikes mostly 4.5-6 mm in diameter
..2 Scale-leaves below the spike obtuse to slightly acute; spikes mostly 1.5-4.5 mm in diameter