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Montana Field Guide

Montana Field Guides

Persian Ryegrass - Lolium persicum

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
C-value: 1


External Links

General Description
Annual bunchgrass. Stems 10–40 cm. Leaves: blades 2–6 mm wide. Inflorescence 10–25 cm long. Spikelets 10–26 mm long, glumes about as long as the spikelet length. Lemmas: 4 to 9 per spikelet, with a slender flexuous awn 5–15 mm long (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced along the southern tier of Canadian provinces and sporadically south into mainly NY, MT, ND, WY and CO (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 50

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)



  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Robertson, N.L. 1987. A new virus-like disease of barley : its etiology, epidemiology, and the ultrastructure of associated virus-like particles. Ph.D. Dissertation. Bozeman, MT: Montana State University. 96 p.
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Citation for data on this website:
Persian Ryegrass — Lolium persicum.  Montana Field Guide.  .  Retrieved on , from