Digitaria sanguinalis (L.) Scop.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Decumbent or prostrate, much branched, rooting at the nodes, usually 3–6 dm; sheaths and blades papillose-pilose, the blades 4–10 cm × 5–10 mm; racemes 3–6 in each of 1–3 whorls, 5–15 cm; rachis 1 mm wide, broadly winged, scabrous on the margins; pedicels triquetrous, scabrous; spikelets 2.4–3.2 mm; first glume minute, often deciduous, the second 0.8–1.8 mm, a third to three-fifths the length of the spikelet; sterile lemma usually scabrous on the 5 strong veins; fertile lemma grayish-brown; 2n=18–76, mostly 36. Native of Europe, now cosmop. and established as a weed of lawns, fields, gardens, and waste places throughout our range and w. to the Pacific, giving way southward to no. 5 [Digitaria ciliaris (Retz.) Koeler].