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Key to Hordeum

Poaceae

Hordeum

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1 Rachis remaining intact at maturity; leaves 5-12 mm wide, with well-developed auricles; [section Hordeum]
1 Rachis disarticulating at maturity; leaves 1-5 mm wide, not auriculate (except in H. murinum ssp. leporinum).
  2 Perennial; glumes 25-150 mm long; [intersectional hybrid derivative of section Sibirica and section Critesion]
  2 Annual; glumes 7-22 (-28) mm long.
    3 Leaves auriculate; glumes of the central spikelet (in the triad) with ciliate margins; [section Hordeum]
    3 Leaves not auriculate; glumes of the central spikelet (in the triad) with scabrous margins; [section Critesion]