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(ryegrass), a genus of perennial or annual herbs of the family Gramineae. The inflorescence is a two-ranked spike, and the spikelets are multiflorous and laterally compressed, that is, appressed to the spike’s axis on the narrow side. There are approximately 15 species (according to some data, as many as 40), which are distributed primarily in the temperate zone of Eurasia and North Africa.

Nine species are found in the USSR. The English ryegrass (L. perenne) is found in damp meadows, on slopes, and in gardens and parks in the European USSR, the Caucasus, Western Siberia, and Middle Asia. One of the best forage grasses, it is cultivated for pasturage and hay. The English ryegrass withstands trampling and grows quickly after being grazed. For these reasons, it is also used for lawns. Other valuable forage grasses include the Italian ryegrass (L. multiflorum) and L persicum, which are found in the Caucasus, and L. rigidum, which grows in the Caucasus and Middle Asia. The darnel (L. temulentum) is widely distributed in the northern and central regions of the European USSR and in Transcaucasia, southwestern Siberia, and the Far East. It grows as an annual weed among spring grain crops. The darnel and several other species of Lolium are usually toxic to humans and livestock (except swine, ducks, and chickens) because of the development in the caryopses of the fungus Stromantinia temulenta, which produces the alkaloid temulin. When flour containing L. temulentum is used, the product may cause poisoning, manifested by dizziness, drowsiness, loss of consciousness, and convulsions. L. remotum, which is distributed throughout the European USSR and the southern Far East, grows as an annual weed among flax plantings. Measures to control the weed species of Lolium include cleaning the seed material and early autumn plowing.


Kormovye rasteniia senokosov i pastbishch SSSR, vol. 1. Moscow-Leningrad, 1950.
Kott, S. A. Sornye rasteniia i bor’ba s nimi, 3rd ed. Moscow, 1961.


References in periodicals archive ?
leporinum 2m, Atriplex prostrata + in 7; Spergularia salina and Lolium rigidum subsp.
Table I Screening methods in the evaluation of crop allelopathic potential Test species Screening method Donor Receiver/Chemical Extract screening Triticum aestivum Triticum aestivum Lolium rigidum Ipomaea batatas Cyperus esculentus Medicago sativa Festuca arundinacea Lotus corniculatus Trifolium pratense Oryza sativa Echinochloa crus-galli Seedling screening Pot screening method Cucumber sativus Brassica Hirta Panicum milliaceum Avena Spp.
1996 Multiple resistance to dissimilar herbicide chemistries on a biotype of Lolium rigidum due to enhanced activity of several herbicide degrading enzymes.
Population Abbreviation Perennial ryegrasses: Manhattan II ManII Citation II CitII Duet Duet Loretta Loret Gator Gator Linn Linn Endurance Endur Mediterranean Med Gettysburg Gett Nine-O-One 9-0-1 PG902 902 Related species: 902 x (Lm x Lr) 902 x(Lm x Lr) Lm x Lr Lm x Lr Lolium multiflorum Lm Lolium rigidum Lr tetraploid L.