Alopecurus geniculatus

Species category

Weed

Common name

water foxtail

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

OvateOvate:
Egg-shaped with basal end the broadest.

Size

  • Length: 3 mm
  • Width: 1.5 mm
  • Thickness: 0.5 mm

Color

Brown base, yellow middle to apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
.

Texture

Shiny and smooth

Lemma

Obscured by glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
.

Palea

Obscured by glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
.

Other structures

Keel of glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
pubescent and geniculateGeniculate:
Bent at a sharp angle.
awn from lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
.

Identification notes

Soft caryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
.

Noxious weed seed categories

Not listed

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Alopecurus geniculatus L.

 Alopecurus geniculatus . Soft caryopsis upper middle. Geniculate awn emerging from the lemma.
Alopecurus geniculatus. Soft caryopsis upper middle. Geniculate awn emerging from the lemma.
 Alopecurus geniculatus . Pubescence.
Alopecurus geniculatus. Pubescence.