Sporobolus compositus var. compositus  (S. asper) tall dropseed Poaceae SPAS; Bx, pb; K, pl; R;

Sporobolus compositus var. compositus.A. A. Reznicek.Michigan Flora on-line.University of Michigan.michiganflora.net

Sporobolus compositus var. compositus.A. A. Reznicek.Michigan Flora on-line.University of Michigan.michiganflora.net (Accessed 5/2016)

Sporobolus compositus var. compositus is a perennial C4  grass (Hilty 2006) to 1.5 m tall; stems to 0.5 cm thick, sheaths overlapping, long-hairy around top. 

Leaves alternate, to 0.4 cm wide, about as long as stems, often longer than inflorescence, hairy near base, above. 

Flower spikelets 1-flowered to 0.6 cm, glumes 1-veined, first glume 0.2-0.4 cm, second 0.3-0.6 cm, lemma longer than second glume, blunt tip boat-shaped, palea as long as lemma; inflorescences branched, mostly enclosed within leaf sheaths, or exerted to 50 cm, pale green to purplish; blooms and fruits Aug.-Oct. 

Wetland status: UPL. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Dry open soil, sand, back dunes, soil pH 5.5-7 (USDA, NRDC 2010).