Lolium persicum

Species category

Weed

Common name

Persian ryegrass

Diagnostic characters

Planting unit

FloretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.

Shape

Lanceolate

Size

  • Length 9–9.5 mm
  • Width 1.9–2 mm
  • Thickness 1–1.5 mm

Color

Light brown

Texture

Smooth

Lemma

Awned

Palea

Exposed its full length; slightly longer than lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
; margins with serrate teeth.

Other structures

CallusCallus:
The hard base of grass florets or spikelets, just above the point of disarticulation.
is wide and straight; rachillaRachilla:
The axis of a spikelet.
is flat.

Identification notes

FloretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
is longer than most ryegrass species but not as wide as some. Surface is smooth. AwnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
is slender and brittle.

Noxious weed seed categories

State Noxious Weed: Montana, Texas 

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Lolium persicum Boiss. & Hohen. ex Boiss.

Synonyms

Lolium dorei B. Boivin
Lolium dorei B. Boivin var. laeve

From Left to Right:  1. Lolium perenne  ssp.  multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum.  Florets with a slender and brittle awn. 
From Left to Right: 1. Lolium perenne ssp. multiflorum 2. Lolium perenne 3. Lolium persicum 4. Lolium temulentum. Florets with a slender and brittle awn. 
 Lolium persicum.  Long florets.
Lolium persicum. Long florets.