Setaria faberi

Species category

Weed

Common name

Japanese bristlegrass, tall green bristlegrass, Chinese foxtail, Chinese millet, giant bristlegrass, nodding foxtail, giant 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

OvalOval:
Broadly elliptic.
to ovateOvate:
Egg-shaped with basal end the broadest.

Size

  • Length 2.5–3 mm
  • Width 1.5–2 mm
  • Thickness 1.3–1.5 mm

Color

Mixed light and dark brown

Texture

TransverseTransverse:
Set crosswise, crossing or at right angles.
ridges on floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
; glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
and sterile lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
papery.

Lemma

TransverseTransverse:
Set crosswise, crossing or at right angles.
ridges at basalBasal:
The base of the fruit or seed opposite the apical end.
half diminishing at apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.

Palea

TransverseTransverse:
Set crosswise, crossing or at right angles.
ridges in center; glossy edges exposed.

Other structures

When present, the second glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
is three-fourths the length of the floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
.

Identification notes

This species is found as both spikeletsSpikelet:
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.
and floretsFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
. The apicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
half of the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
is more pointed and smoother than the basalBasal:
The base of the fruit or seed opposite the apical end.
half. The smooth edges of the paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.
show, and the second glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
is three-fourths the length of the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
.

Noxious weed seed categories

State Noxious Weed: Alabama, Arkansas, California, Colorado, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Michigan, Minnesota, Missouri, Mississippi, North Carolina, Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia 

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Setaria faberi R.A.W. Herrm.

Synonyms

 Setaria faberi.  Florets with smooth palea edges.
Setaria faberi. Florets with smooth palea edges.
From Left to Right:  1.  Setaria pumila  ssp.  pumila  2.  Setaria faberi  3.  Setaria viridis  4.  Setaria italica. 
From Left to Right:  1. Setaria pumila ssp. pumila 2. Setaria faberi 3. Setaria viridis 4. Setaria italica.