Glyceria maxima (Hartm.) Holmb.  
Family: Poaceae
English water grass, reed manna grass, tall glyceria, tall manna grass
[Glyceria spectabilis Mert. & W.D.J.Koch, Molinia maxima Hartm.]
Glyceria maxima image
Emmet J. Judziewicz  
Etymology: Maxima (Latin) - greatest 
Plants: perennial, rhizomatous, semi-aquatic grass, with unbranched stem up to 2.5 m tall 
Leaves: blades flat or slightly folded, 2 cm wide x 22-29 cm long, shallowly grooved with prominent mid-ribs, apex acute, margins with stiff, short hairs; sheaths rough with reddish-brown band at the junction with the leaf 
Ligule: 5 mm wide, acute at apex
Inflorescence: panicle 15-30 cm long; spikelets 5-8 mm long; glumes keeled; lemmas 3 mm long, ovate, obtuse 
Habitat: meadows, streams, lakeshores
Glyceria maxima is an aggressive exotic weed.
Glyceria maxima image
Pat Trochlell  
Glyceria maxima image
Trochlell, Pat  
Glyceria maxima image
Trochlell, Pat  
Glyceria maxima image
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