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Annual Ryegrass

Description

Annual ryegrass, also referred to as Italian ryegrass, is a bunch-type grass that can be used as a nurse crop for quick cover or for winter overseeding of bermudagrass on low maintenance athletic fields or golf courses. It does not possess the quality of perennial ryegrass and is not recommended for sites where high quality turf is desired. However, it is very inexpensive and can be used on low profile fields such as school, park or recreation sites where winter color is desirable. Its seedhead can be confused with that of quackgrass. Annual ryegrass does not have rhizomes, whereas quackgrass does. Annual ryegrass can be easily confused with tall fescue. However, tall fescue has rough leaf blade margins on the lower 1/3 - 1/2 of the leaf whereas annual ryegrass has smooth ones. Tall fescue has non-clasping auricles, whereas annual ryegrass has clasping auricles. The backside of the tall fescue leaf blade is less glossy than that of annual ryegrass.

Presentations

Publications

Species Data

Seedhead/Flower

a spike, with spikelets along the main stem

p1060805 annual
p1060805 annual
p1060805 annual
p1060815 annual
p1060815 annual
p1060815 annual
p1060816 annual
p1060816 annual
p1060816 annual
seedhead
seedhead
seedhead
seedhead3
seedhead3
seedhead3
Vernation type

leaves rolled in the bud

dscn0997
dscn0997
dscn0997
vernation
vernation
vernation
Ligule Type

membranous; blunt, 0.04 - 0.08 inches (1 - 2 mm) long

ligule
ligule
ligule
Growth Season/Life Cycle

cool season turf or winter annual weed

Auricle type

pointed or blunt or claw-like, clasping

annualryegrass dsc 0865
annualryegrass dsc 0865
annualryegrass dsc 0865
annualryegrass dsc 0867
annualryegrass dsc 0867
annualryegrass dsc 0867
annualryegrass dsc 0870
annualryegrass dsc 0870
annualryegrass dsc 0870
annualryegrass dsc 1046
annualryegrass dsc 1046
annualryegrass dsc 1046
auricles2
auricles2
auricles2
ligule
ligule
ligule
Leaf blade tip shape

sharp-pointed; bright green, upper surface dull, deeply ridged, lower surface smooth, glossy and slightly creased, edges smooth

dscn0973
dscn0973
dscn0973
Leaf blade width

0.1 - 0.28 inches (3 - 7 mm) wide

leaf attach
leaf attach
leaf attach
Stolon Presence

absent

Rhizome Presence

absent

Collar Type

continuous; indistinct, not hairy

Sheath Margin

split with overlapping margins

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