Oryza punctata

Species category

Weed

Common name

red 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

OvalOval:
Broadly elliptic.

Size

  • Length 4–5 mm
  • Width 1.5–2.3 mm
  • Thickness 1–1.2 mm

Color

White

Texture

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

Lemma

Compressed, hairy and sometimes awned

Palea

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

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 brown 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 punctata Kotschy ex Steud.

 Oryza punctata.  White spikelets with caryopses that have a brown pericarp. Photo by Julia Scher, USDA-APHIS-PPQ.
Oryza punctata. White spikelets with caryopses that have a brown pericarp. Photo by Julia Scher, USDA-APHIS-PPQ.
 Oryza punctata . Brown caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.
Oryza punctata. Brown caryopses. Photo by Julia Scher, USDA-APHIS-PPQ.