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Key to Eustachys

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1 Lateral nerves of the fertile lemma glabrous; culms stout, 7-15 dm tall; spikes 8-16 (-20), 7-12 cm long
1 Lateral nerves of the fertile lemma pubescent; culms slender, 3-10 dm tall; spikes 1-20, 2.5-9 cm long.
  2 Keel of the fertile lemma glabrous; [exotics, in disturbed situations].
    3 Spikelets >2.4 mm long; sterile floret oblanceolate, acute
    3 Spikelets <2.1 mm long; sterile floret widely cuneate, truncate
  2 Keel of the fertile lemma pubescent; [natives and exotics].
      4 Spikelets 1.5-2.5 mm long; lowest lemma in each spikelet mucronate.
        5 Lowest lemma in each spikelet tawny to reddish-brown; lateral veins of the lowest lemma in each spikelet with spreading hairs > 0.5 mm long; [rare introduction]
        5 Lowest lemma in each spikelet dark brown; lateral veins of the lowest lemma in each spikelet with appressed hairs < 0.5 mm long; [common native from NC south to s. FL, west to LA and beyond our area]
      4 Spikelets 2.6-3.7 mm long; lowest lemma in each spikelet awned, the awns 0.4-1.2 mm long.
          6 Panicle branches 1-3; awns of the lowest lemma in each spikelet 0.4-0.6 mm long; spikelets 3.0-3.7 mm long
          6 Panicle branches (3-) 4-9; awns of the lowest lemma in each spikelet 0.7-1.2 mm long; spikelets 2.6-3.0 mm long