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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Alopecurus

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1 Glumes 4-6 mm long, acute or acuminate.
  2 Glumes with hairs < 1.0 mm long on the keel, merely scabrous toward the tip
  2 Glumes with hairs 1.0-1.5 mm long on the keel, including toward the tip
1 Glumes 2-3.2 mm long, obtuse or truncate.
    3 Awn about as long as the glumes (at most exceeding the glumes by 1 mm)
    3 Awn longer than the glumes, exceeding the glumes by 1.5-3.5 mm.
      4 Anthers 0.4-0.7 mm long; annual
      4 Anthers 1.3-2 mm long; perennial
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