Phalaris L.
Panicle cylindrical, more than twice as long as broad
Panicle lobed, with conspicuous branches, usually interrupted, 5–25 cm long.
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