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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 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]
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