Glyceria obtusa is a perennial grass 60 cm to 1 m tall, freely branched;
Leaves with sheaths closed except at top, ligule less than 0.1 cm, stem leaves 3-6, 0.3-0.8 cm wide, rough textured above.
Flower spikelets 3-7 flowered, 0.4-0.7 cm long, glumes broad, lemmas blunt to 0.4 cm; inflorescence branched, very contracted, thick, dense, cylindrical to elliptic 6-12 cm long, Aug.-Sept.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Wet woods, marshes, peaty or sandy soil.