Echinochloa colona

Species category

Weed

Common name

jungle rice

Diagnostic characters

Planting unit

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.

Shape

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

Size

  • Length 3 mm
  • Width 2 mm
  • Thickness 1.5 mm

Color

Brown glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
; yellow to gray floretsFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
with yellow lines.

Texture

Shiny and smooth 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.
; few hispid hairs on the glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
.

Lemma

Very convex and an equally pointed apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
and base

Palea

Flat

Other structures

Short point on the sterile lemma apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.

Identification notes

The 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.
have few hispid hairs on their nerves. The second glumeGlume:
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.
about same length. 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.
are very shiny and smooth and have distinct lines on them.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Echinochloa colona (L.) Link

Synonyms

Panicum colonum L.

 Echinochloa colona.  Spikelets with shiny and smooth lemma and palea with few hispid hairs on the glumes. 
Echinochloa colona. Spikelets with shiny and smooth lemma and palea with few hispid hairs on the glumes. 
 Echinochloa colona.  Multiple views of spikelet. Spikelets in various views, some with purple coloring. Photo courtesy of USDA-APHIS-PPQ.
Echinochloa colona. Multiple views of spikelet. Spikelets in various views, some with purple coloring. Photo courtesy of USDA-APHIS-PPQ.