Lolium

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  L. temulentum

  1a. Glume (5.5–) 7–28 mm long, the body 0.75–1.5 times as tall as the column of florets; plants annual, with 2- to 10-flowered spikelets
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  1b. Glume 3.5–15 mm long, the body 0.25–0.75 times as tall as the column of florets [Fig. 239]; plants annual or perennial, with (2–) 5- to 22-flowered spikelets (when annual, with 10 or more florets per spikelet)
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    L. multiflorum

    2a. Rachis of the inflorescence rough on the surface opposite the spikelet; spikelets with (10–) 11–22 florets; apex of the glume of upper spikelets not reaching the tip of the lowest lemma on the same side; lemmas of the upper florets with a conspicuous awn to 10 mm (rarely absent); leaf blades rolled in young shoots, (2–) 3–8 (–13) mm wide at maturity
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    L. perenne

    2b. Rachis of the inflorescence smooth on the surface opposite the spikelet, rough only on the angles; spikelets with mostly (2–) 5–10 florets [Fig. 239]; apex of the glume of upper spikelets more or less extending to the tip of the lowest lemma on the same side; lemmas with relatively short awns (awns sometimes absent or rarely prolonged to 8 mm); leaf blades folded in young shoots, (1–) 2–4 (–6) mm wide at maturity

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