Phalaris L.

Male or sterile lemma awnless or with a terminal awn Phalaris

Spikelets not in groups; all with 1 bisexual floret.

Panicle cylindrical, more than twice as long as broad

Panicle cylindrical, neither lobed nor interrupted, 5–40 cm long. Spikelets densely crowded, 3.5–7.5 mm long. Robust perennial to 2 m high

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Panicle usually c. 5 mm diam. (rarely up to 10 mm), up to 6 cm long. Glumes ± wingless, blunt, usually finely toothed on the margins. Annual, usually c. 1 m high. Coast. Floodways. Introd. from America. Fl. spring. Phalaris angusta

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Panicle more than 1 cm diam. Glumes winged, usually acuminate