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Keyed in multiple places:

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Key to Crypsis

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1 Spikelets 1.5-2.8 mm long; panicles 7-8× as long as broad, usually fully exserted beyond the upper sheath when mature
1 Spikelets 2.7-3.2 mm long; panicles1-5× as long as broad, usually partly enclosed in the uppermost sheath when mature

Key to Poaceae, Key J: dense spike grasses

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1 Lemma 8-11.5 (-14) mm long; [tribe Poeae]
1 Lemma 0.5-6 mm long.
  2 Glumes awned; [tribe Poeae].
    3 Glume awns prominently pilose
    3 Glume awns not hairy
      4 Glume awn 0.7-3 mm long; lemmas not awned
      4 Glume awn 3-8 mm long; lemmas awned
  2 Glumes unawned.
        5 Lemmas much shorter than the glumes; [tribe Poeae]
        5 Lemmas about equaling or longer than the glumes.
          6 Lemmas about equaling the glumes; [tribe Poeae]
          6 Lemmas longer than the glumes; [tribe Zoysieae; subtribe Sporobolinae]