Psathyrostachys juncea

Species category

Revegetation or Rangeland

Common name

Russian wildrye

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 6.5–8 mm
  • Width 1–1.2 mm
  • Thickness 1–1.2 mm

Color

Light brown

Texture

ScabrousScabrous:
Rough to the touch, covered with minute points of very short, stiff hairs.
and usually copiously short pubescentPubescent:
Having hairs.

Lemma

Papery; awnless or short awned; back rounded; humped by callusCallus:
The hard base of grass florets or spikelets, just above the point of disarticulation.
.

Palea

Concave with sunken appearance

Other structures

CallusCallus:
The hard base of grass florets or spikelets, just above the point of disarticulation.
is knoblike. RachillaRachilla:
The axis of a spikelet.
is stout.

Identification notes

Occasionally, glumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
are attached to basal floretsFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
; if so, they are short (three-fourths the lemmaLemma:
One of two bracts of the grass floret; it is located on the side nearest the embryo and opposite the rachilla.
length), narrow, and sharply pointed. All parts of the floretFloret:
A small flower in a clustered inflorescence (e.g., sunflower, grasses). In grasses, a floret consists of the lemma, palea, stamens, and pistil.
have some degree of pubescence.

Noxious weed seed categories

Not listed

AOSA examination list

Included

Nomenclature

Family

Poaceae

Valid name

Psathyrostachys juncea (Fisch.) Nevski

Synonyms

Elymus junceus Fisch.
×Leymostachys korovinii
Tzvelev

 Psathyrostachys juncea.  Florets with all parts have some degree of pubescence.
Psathyrostachys juncea. Florets with all parts have some degree of pubescence.