Bromus secalinus

Species category

Weed

Common name

rye brome

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

Long and ellipticElliptic:
Outline of an ellipse; greatest width midway sloping to an equally pointed apex and base.

Size

  • Length: 7 mm
  • Width: 2 mm
  • Thickness: 2 mm

Color

Dark brown

Texture

Smooth

Lemma

LemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
, paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.
, and caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
are about the same length.

Palea

Same length as lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
; keel hairs hispid.

Other structures

Short awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
is on the lemma apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
. RachillaRachilla:
The axis of a spikelet.
bowed with a large scar.

Identification notes

The caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
is about the same length as the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
and paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.
. It is also thick and deeply indented longitudinally.

Noxious weed seed categories

State Noxious Weed: Alabama, Arkansas, Delaware, Florida, Georgia, Kansas, Louisiana, Mississippi, New Jersey, Oklahoma, South Carolina, Tennessee, Texas, Wyoming 

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Bromus secalinus L.

 Bromus secalinus.  Florets with a rachilla that's bowed with a large scar.
Bromus secalinus. Florets with a rachilla that's bowed with a large scar.