Rough (also called roughstalk) bluegrass has a relatively limited adaptation as a turf species because of intolerance to heat, drought, and traffic. It is also very patchy in appearance and therefore does not perform well in mixtures. However, rough bluegrass is sometimes used alone or in combination with perennial ryegrass for winter overseeding of golf course putting greens. Rough bluegrass can often be confused with Kentucky bluegrass. One way to distinguish them is to examine the root structures: rough bluegrass has stolons (above ground) and Kentucky bluegrass has rhizomes (below ground). Another way to distinguish between them is that rough bluegrass has a long, pointed membranous ligule and Kentucky bluegrass has a short, even membranous ligule.
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seedhead is a panicle with flattened spikelets with 2-3 seeds each
leaves folded in the bud
membranous; sharp pointed, entire, may be hairs along the edge, 0.16 - 0.24 inches (4 - 6 mm) long
cool season turf or perennial weed
boat shaped; flat, sharply creased, glossy, edges rough at least near tip; two distinct, clear lines, one on each side of the midrib
0.04 - 0.16 inches (1 - 4 mm) wide
divided by midrib, distinct
open part way only
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