Oryza longistaminata

Species category

Weed

Common name

longstamen rice

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

Oblong

Size

  • Length 6.5–8 mm 
  • Width 2–2.2 mm 
  • Thickness 1.2–1.5 mm 

Color

Brown

Texture

Striate and coarse and appressedAppressed:
Pressed close or lying flat against something.
hairs

Lemma

Compressed, hairy and sometimes awned

Palea

Compressed and hairy

Other structures

GlumesGlume:
The pair of chaffy bracts that occur at the base of a grass spikelet, often completely enclosing it.
are short and appressedAppressed:
Pressed close or lying flat against something.
to the base.

Identification notes

CaryopsisCaryopsis:
The single-seeded fruit or grain of the grass family (Poaceae); the fruit wall (pericarp) is united with the seed coat (testa).
with red pericarpPericarp:
Fruit wall; derived from the ovary wall.
.

Noxious weed seed categories

State Noxious Weed: Louisiana, Mississippi, Texas 
Federal

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

AOSA examination list

Not included

Nomenclature

Family

Poaceae

Valid name

Oryza longistaminata A. Chev. & Roehr.

 Oryza longistaminata.  Glumes are short and appressed to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
Oryza longistaminata. Glumes are short and appressed to the base. Photo by Julia Scher, USDA-APHIS-PPQ.
 Oryza longistaminata.  The caryopsis has a red pericarp. Photo by Julia Scher, USDA-APHIS-PPQ.
Oryza longistaminata. The caryopsis has a red pericarp. Photo by Julia Scher, USDA-APHIS-PPQ.