Lolium perenne multiflorum (weed)

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Lolium multiflorum (click on image to enlarge it)
Author(s): Julia Kruse
Source: Open Media

Lolium perenne multiflorum (weed) (Lam.) Husnot - (Italian ryegrass)

The species is a wide-spread weed in temperate regions. It is a problem in cereals like wheat, vegetables, as well as in various other crops. Yield losses of 50% and more have been estimated. It is also grown for turf and as a forage crop. Further, it may be used as an inter-row cover in maize to limit nitrogen loss. The species is well adapted to soil of low and average fertility and has developed resistance to various herbicides. It propagates through its seeds, but the seeds are rather heavy and natural dispersal is limited.

Vernacular names
• Deutsch: italienisches Raygras
• English: Italian ryegrass
• Español: raigras italiano
• Français: ray-grass d'Italie

Italian ryegrass grows to a height of about 1 m. The leaves are 3-10 mm wide, glossy (no hairs), with a short ligule (1-2 mm long) and little ear-like projections (auricles) on the collar. It has spikes (5-30 mm long) containing 10-20 florets. Rhizomes are absent.

Several authors consider Italian ryegrass to be a seperate species and perennial ryegrass (Lolium perenne perenne) to be another species, rather than both being subspecies.

Synonyms:
Lolium multiflorum