Hesperostipa comata

Species category

Revegetation or Rangeland, Weed

Common name

needle and thread

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

Oblanceolate

Size

  • Length 10–13 mm
  • Width 1–1.2 mm
  • Thickness 1–1.2 mm

Color

Brown; light brown longitudinal lines.

Texture

Smooth

Lemma

Sharp pointed callusCallus:
The hard base of grass florets or spikelets, just above the point of disarticulation.
covered with appressedAppressed:
Pressed close or lying flat against something.
hairs

Palea

Totally enclosed in lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.

Other structures

Long twisted awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
terminating with a lateral arm.

Identification notes

Small crown at base of awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Hesperostipa comata (Trin. & Rupr.) Barkworth

 Hesperostipa comata.  Small crown at the base of the awn.
Hesperostipa comata. Small crown at the base of the awn.