Spartina cynosuroides, big cordgrass. Jamie Cromartie.Native Flora of the Eastern United States. 7/2017

Spartina cynosuroides is a perennial C4 grass (Waller and Lewis 1979) 1-3 m tall, stems coarse, colonial from long stout rhizomes. 

Leaves alternate, 0.8-2 cm wide, with rough, cutting margins. 

Spartina cynosuroides, blooming. Zihao Wang. Inwood Park, NYC.11/2015

Flower spikelets overlapping, dry, papery; inflorescence dense with numerous, crowded, one-sided spikes; blooming and fruiting Aug.-Oct.(Hough 1983). 

Fruit dry 1-seeded. 

Wetland status: OBL. 

Frequency in NYC: Infrequent. 

Origin: Native. 

Habitat: Salt marshes and brackish water, Salt tolerant. soil pH 5.8-7.5 (USDA, NRCS 2010).