Names
Scientific synonyms (71): Festuca perennis (L.) Columbus & J.P.Sm., Hordeum compressum Boiss. & Orph., Lolium aechicum Rouville, Lolium agreste Roem. & Schult., Lolium annuum Bernh., Lolium brasilianum Nees, Lolium canadense Bernh. ex Rouville, Lolium cechicum Opiz, Lolium compressum Boiss. & Orph. ex Nyman, Lolium cristatum Pers. ex B.D.Jacks., Lolium felix Rouville, Lolium glumosum Planellas, Lolium gmelinii Honck., Lolium halleri C.C.Gmel., Lolium jechelianum Opiz, Lolium latum Roth ex Steud., Lolium marschallii Steven, Lolium montevidense Rouville, Lolium perenne f. compositum (Schrad.) Neuman, Lolium perenne f. microstachyum R.Uechtr., Lolium perenne f. polyanthum (Beck) Neuman, Lolium perenne f. tenue (L.) Neuman, Lolium perenne subsp. compositum (Schrad.) Arcang., Lolium perenne subsp. cristatum (Pers.) K.Richt., Lolium perenne subsp. ramosum Arcang., Lolium perenne subsp. stoloniferum (C.Lawson) Wipff, Lolium perenne subsp. tenue Dumort., Lolium perenne subsp. trabutii (Hochr.) Dobignard, Lolium perenne var. angustifolium Parn., Lolium perenne var. aristatum Coss. & Germ., Lolium perenne var. aristulatum Schur, Lolium perenne var. auriculatum Hack., Lolium perenne var. brasilianum (Nees) Kuntze, Lolium perenne var. commune Alef., Lolium perenne var. compositum Schrad., Lolium perenne var. compressum Sibth., Lolium perenne var. condensatum Schur, Lolium perenne var. confertum Spenn., Lolium perenne var. cristatum Pers., Lolium perenne var. furcatum Godr., and more.
In other languages
- en: Italian ryegrass, annual ryegrass
Where it is recorded
- USDA PLANTS: LOPEM2
- GRIN: 22494
- POWO: urn:lsid:ipni.org:names:407493-1
- Wikidata: Q161722
Taxonomy record sources: POWO (CC BY 4.0), USDA_PLANTS_GATE2 (Public Domain). Loaded from the botanica open cultivated-plant knowledge base and the GBIF backbone; each row keeps its origin.
What the sources say it wants
Each line shows the band, then the kind of source and the citation. "Published" means the number is printed on the cited page; "derived" means it was computed from published numbers with the formula recorded on the row; "external API" rows are refreshed nightly from a live source; "curated" rows are OAT's own working values from June 2026.
Whole cycle
| Zone | Measure | Band | Source |
|---|---|---|---|
| Root zone | Root-zone EC (dS/m) | up to 5.6 (warning above 6.9, alert above 8.9) | published: FAO Irrigation and Drainage Paper 29, 1985 |
| Timing | Crop coefficient, end of season (ratio) | 1 | published: FAO Irrigation and Drainage Paper 56, 1998 |
| Timing | Crop coefficient, initial stage (ratio) | 0.95 | published: FAO Irrigation and Drainage Paper 56, 1998 |
| Timing | Crop coefficient, mid-season (ratio) | 1.05 | published: FAO Irrigation and Drainage Paper 56, 1998 |
Keystone status
Partial. The KEEP rule asks for a growth stage and a band in each of light, air and root zone before a crop counts as complete; this plant is in the keystone with what its sources give so far.
Generated 2026-09-15 from the OAT plant keystone. Source types and citations are carried on every row; the keystone snapshot that the Library instruments read is plant-targets.json and its quality sheet is plant-targets.quality.json.