Phleum pratense L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Tufted, usually 5–10 dm, the culms somewhat bulbous-thickened at base, minutely scabrous at the summit; upper sheaths terete, not dilated; blades ordinarily 5–8 mm wide, rough-margined; infl cylindric, (3–)5–10(–15) cm × 5–8 mm; glumes 2–3.2 mm, abruptly rounded-truncate to an awn 0.7–1.5 mm, hispidulous-ciliate on the keel, with thin, pale or green margins; 2n=14, 21, 28–84. Native of Europe, cult. for hay and pasture, escaped and naturalized throughout most of the U.S. and s. Can.