Digitaria cognata  (Leptoloma cognatum) fall witch-grass Poaceae LECO; Q; K, fl (Z. Wang); R;

 

Digitaria cognata. Copyright © 2014 Anna Gardner. Anna Gardner.Iowa State University.www.eeob.iastate.edu.research.iowagrass

Digitaria cognata. Copyright © 2014 Anna Gardner.Iowa State University.www.eeob.iastate.edu.research.iowagrasses.index.html (Accessed 6/2014).

Digitaria cognata is a perennial C3 grass (Waller and Lewis 1979) un, 40-70 cm, tufted, stems much branched at base; lower sheaths hairy. 

Leaves alternate. 5-10 cm long, 0.2-0.6 cm wide, flat.  

Flower spikelets solitary at branch tips, 1-flowered, about 0.3 cm long, glumes hairy between veins; flowering branches elongate 3-angled, rough-textured, 1-4 cm long; June-Oct., inflorescence open, diffuse, purplish; a third to a half the height of plant, axils hairy, breaking off at maturity and acting as a tumble-weed to disperse seeds. 

Wetland status: NL. 

Frequency in NYC: Very infrequent. 

Origin: Mostly S.E. and Midwestern U.S. Occasionally N.E. to NH 

Habitat: Dry, open, sandy soil.