Ischaemum rugosum

Species category

Weed

Common name

ribbed murainagrass, co muraina, saramattagrass, tho muraina, wrinkle duck-beak

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

Conical

Size

  • Length 3–4 mm 
  • Width 1.5–2.5 mm 
  • Thickness 1.5–2.5 mm 

Color

Light brown

Texture

Smooth; outer glumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
has large transverseTransverse:
Set crosswise, crossing or at right angles.
ridges.

Lemma

Papery and awned

Palea

Papery

Other structures

Scar at base

Identification notes

Compressed 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.
is difficult to analyze. GlumeGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
ridges are the outstanding characteristic.

Noxious weed seed categories

Federal

Learn more on ITP's Federal Noxious Weed Disseminules tool.

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Ischaemum rugosum Salisb.

 Ischaemum rugosum.  Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
 Ischaemum rugosum.  Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum. Spikelets. Photo by Julia Scher, USDA-APHIS-PPQ.
 Ischaemum rugosum.  Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum. Caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
 Ischaemum rugosum.  Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.
Ischaemum rugosum. Outer glume with large transverse ridges. Photo by Julia Scher, USDA-APHIS-PPQ.