Paspalum setaceum Michx.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Culms tufted, prostrate to erect, 3–10 dm from short, knotty rhizomes; herbage variously glabrous or puberulent or long-hairy; lvs 3–20 mm wide, racemes 1–4; spikelets usually paired, 1.4–2.5 mm, three-fourths to fully as wide, variously elliptic-obovate to obovate or suborbicular, glabrous or finely villosulous or with minute, capitate hairs, often brown-dotted; glume 2- veined or obscurely 3-veined; sterile lemma 2- or 3-veined, the midvein developed or not; 2n=20, 40, 50. Dry or moist, open or lightly wooded places, often in sandy soil; N.H. to Fla. and the W.I., w. to Minn., Nebr., Colo., and Ariz.