| 1. | The spikelets are in pairs, and there are three stamens.
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| 2. | The flowerhead is open, with 10 to 15 erect spikelets.
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| 3. | The inflorescence is an open arrangement of nodding, flat spikelets.
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| 4. | The spikelets are flattened and made up of layered rounded fruits.
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| 5. | The inflorescence is divided into several branches coated in green spikelets.
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| 6. | These may have some cleistogamous spikelets in them, as well.
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| 7. | The inflorescence is usually divided into two branches lined with spikelets.
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| 8. | The spikelets are borne in an open or somewhat open panicle.
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| 9. | Each spikelet is long; the awn attached around the middle.
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| 10. | The inflorescence is a narrow panicle of up to 18 spikelets.
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