Setaria leucopila

Species category

Agricultural, Turf

Common name

streambed bristlegrass, bristlegrass, yellow bristlegrass, Plains bristlegrass, yellow foxtail

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

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

Size

  • Length 2–2.5 mm
  • Width 1.5–1.7 mm
  • Thickness 0.9–1 mm

Color

Brown

Texture

TransverseTransverse:
Set crosswise, crossing or at right angles.
ribs over longitudinal striations

Lemma

Hard with margins that extend over paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.
margin

Palea

Hard with margins covered by lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.

Other structures

FloretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
often covered by papery glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
forming a spikeletSpikelet:
One or more florets that are subtended by a pair of bracts called glumes. Spikelets are pedicellate if located on a pedicle and sessile if attached directly to the rachis. Often spikelets with single florets have remnants of a second floret, usually a lemma.
.

Identification notes

There are three glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
, one is sterile.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Setaria leucopila (Scribn. & Merr.) K. Schum.

Synonyms

Chaetochloa leucopila Scribn. & Merr.

 Setaria leucopila.  Florets with three glumes, one of which is sterile.
Setaria leucopila. Florets with three glumes, one of which is sterile.
 Setaria leucopila . Florets are often covered by papery glumes, forming a spikelet.
Setaria leucopila. Florets are often covered by papery glumes, forming a spikelet.