Digitaria filiformis  (D. laeviglumis) slender crab-grass Poaceae DIFI; R;

Digitaria filiformis.By Agnes Chase. Public Domain. For Reuse- Contact A.S. Hitchcock. 1950. Manual of Grasses of the United States (2nd edition rev. Agnes Chase), USDA Misc. Pub. 200.New England Wild Flower Society.gobotany.newenglandwild.org

Digitaria laeviglumis (D. filiformis).USDA-NRCS PLANTS Database.Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Miscellaneous Publication No. 200. Washington, DC (Accessed 4/2014).

Digitaria filiformis is an annual (probably C4, see Waller and Lewis 1979) grass, 5-90 cm tall, branched from base, stems filamentous, not rooting at nodes; lower sheaths hairy. 

Leaves 5-20 cm long, 0.2-0.6 cm wide, flat, often hairy below, rough above. 

Flower spikelets about 0.2 cm, 1-flowered, 2-3 together, hardly overlapping, glumes glandular-hairy, lemma dark, brown or purplish, longer than glume; inflorescence of 2-6 thin spikes 1-15 cm long along the end of the flowering stem, spike axis 3-angle, hardly winged; blooms and fruits Aug.-Oct. 

Wetland status: NL. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Open, sandy sterile soil.