Anthoxanthum odoratum

Species category

Weed

Common name

sweet vernalgrass

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

Lanceolate

Size

  • Length: 3 mm
  • Width: 1 mm
  • Thickness: 1 mm

Color

Dark brown

Texture

Smooth with brown appressedAppressed:
Pressed close or lying flat against something.
hairs

Lemma

Smooth and completely surrounding the paleaPalea:
One of the thin bracts of grass floret enclosing the fruit (caryopsis) that is located on the side opposite the embryo.

Palea

Enclosed 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

Two sterile lemmasLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
with awnsAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
subtend the true 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

The sterile lemmasLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
each have awnsAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
, with one awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
being much longer and geniculateGeniculate:
Bent at a sharp angle.
than the other. They are also coarsely granularGranular:
Resembling or consisting of small grains or particles.
and copiously pubescentPubescent:
Having hairs.
well above the middle 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

Not listed

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Anthoxanthum odoratum L.

 Anthoxanthum odoratum.  The sterile lemmas each have awns, with the one awn being much longer and geniculate than the other. They are also coarsely granular and copiously pubescent well above the middle of the lemma.
Anthoxanthum odoratum. The sterile lemmas each have awns, with the one awn being much longer and geniculate than the other. They are also coarsely granular and copiously pubescent well above the middle of the lemma.