Sorghastrum nutans

Species category

Revegetation or Rangeland

Common name

Indiangrass, yellow Indian-grass

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 6.5–8 mm 
  • Width 1.4–1.6 mm 
  • Thickness 1.3–1.5 mm 

Color

Brownish-yellow and dark brown

Texture

Long hairs on base, rachis segmentRachis segment:
A segment of the central axis of the inflorescence (rachis). In some species (e.g. Andropogon) separation of the sessile spikelets occurs when the rachis disarticulates at the spikelet bases leaving the segment of the rachis between spikelets attached to the lower spikelet.
and pedicelPedicel:
The stalk within an inflorescence supporting a single flower or spikelet.
; long awnAwn:
A narrow, bristle-like organ, as on the glumes or lemmas of grasses (Poaceae).
.

Lemma

Thin; not visible.

Palea

Thin; not visible.

Other structures

Thin rachis segmentRachis segment:
A segment of the central axis of the inflorescence (rachis). In some species (e.g. Andropogon) separation of the sessile spikelets occurs when the rachis disarticulates at the spikelet bases leaving the segment of the rachis between spikelets attached to the lower spikelet.
and pedicelPedicel:
The stalk within an inflorescence supporting a single flower or spikelet.

Identification notes

First glume flat, second glume strongly ridged. The thin and narrow rachis segmentRachis segment:
A segment of the central axis of the inflorescence (rachis). In some species (e.g. Andropogon) separation of the sessile spikelets occurs when the rachis disarticulates at the spikelet bases leaving the segment of the rachis between spikelets attached to the lower spikelet.
and pedicelPedicel:
The stalk within an inflorescence supporting a single flower or spikelet.
are useful for identification.

Noxious weed seed categories

Not listed

AOSA examination list

Included

Nomenclature

Family

Poaceae

Valid name

Sorghastrum nutans (L.) Nash

Synonyms

Andropogon nutans L.
Sorghastrum avenaceum (Michx.) Nash

From Left to Right: 1.  Andropogon gerardii  2.  Andropogon hallii  3.  Sorghastrum nutans  4.  Schizachyrium scoparium  5.  Bothriochloa ischaemum.  
From Left to Right: 1. Andropogon gerardii 2. Andropogon hallii 3. Sorghastrum nutans 4. Schizachyrium scoparium 5. Bothriochloa ischaemum. 
 Sorghastrum nutans . The thin and narrow rachis segment and pedicel is useful for identification.
Sorghastrum nutans. The thin and narrow rachis segment and pedicel is useful for identification.