Annual or perennial; stems rough below the spike; lvs to 8 mm wide; rachis rough on the side opposite the spikelet; florets mostly 11-22; tip of the glume seldom extending to the top of the lemma just above it; lemmas, at least the upper, with awns to 15 mm. (L. p. var. italicum; L. multiflorum)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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From Flora of Indiana (1940) by Charles C. Deam
This ryegrass has been found in several counties in the state in lawns, parks, and golf grounds and may be considered established.