Hordeum L.

Spikelets with 1 floret, in clusters of 3 at each node. Glumes linear, awn-like (Fig. 50) Hordeum

Rhachis fragmenting at maturity

Leaves with auricles

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Anthers of central spikelet 0.7–1.4 mm long, pale and exerted. Inflorescence 3–10 cm long, cylindrical. Spikelets 4–6 cm long (including the awns). Annual up to 30 cm high. Widespread. Weed of cultivation, pastures and waste places. Introd. from Europe, Asia and N. Africa. Fl. winter–spring. Barley Grass Hordeum leporinum

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Anthers of central spikelet 0.2–0.5 mm long, usually black and not exerted. Inflorescence 2–8 cm long. Spikelets 4–6 mm long (including the awns). Annual to 40 cm tall. Widespread. Introd. from Europe and Asia. Fl. spring Hordeum glaucum