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Key to Cortaderia

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1 Sheaths hairy, sometimes densely so; culms 4-5x as long as panicles; panicles arising well above the leaves; awns of the lemmas 1 mm long or less
1 Sheaths glabrous to sparsely hairy; culms 2-4x as long as panicles; panicles arising only slightly above the leaves; awns of the lemmas 2.5-5 mm long