Sporobolus giganteus

Species category

Revegetation or Rangeland

Common name

giant dropseed

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

Lanceolate 

Size

  • Length 2.8–3 mm 
  • Width 1–1.2 mm 
  • Thickness 0.5–0.6 mm 

Color

Light brown Caryopsis, 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 white

Texture

Smooth and translucent

Lemma

Papery and transparent; about 3.0 mm long

Palea

Papery and transparent; about 3.0 mm long

Other structures

The caryopsis embryoEmbryo:
A rudimentary plant contained in a seed, usually consisting of a more or less differentiated axis and attached cotyledon(s).
is slightly darker.

Identification notes

This species is much like S. cryptandrus but larger. No individual photo has been made of this species at this time.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

More information

For more information, see ISMA fact sheet, Sporobolus spp.

Nomenclature

Family

Poaceae

Valid name

Sporobolus giganteus Nash

 Sporobolus neglectus . The caryopsis embryo is slightly darker. From Left to Right: 1. Bottom.  Sporobolus neglectus  2. Bottom.  Sporobolus airoides  3. Bottom.  Sporobolus clandestinus  4. Top.  Sporobolus compositus  5. Top.  Sporobolus giganteus  6. Top.  Sporobolus cryptandrus.
Sporobolus neglectus. The caryopsis embryo is slightly darker. From Left to Right: 1. Bottom. Sporobolus neglectus 2. Bottom. Sporobolus airoides 3. Bottom. Sporobolus clandestinus 4. Top. Sporobolus compositus 5. Top. Sporobolus giganteus 6. Top. Sporobolus cryptandrus.