Zea mays

Species category

Agricultural

Common name

corn

Diagnostic characters

Planting unit

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

Shape

ObovateObovate:
Inverted egg shaped with apical end the broadest.
with a truncated apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.

Size

  • Length 10 mm
  • Width 5 mm
  • Thickness 2 mm

Color

Various

Texture

Smooth in most to extremely wrinkled in others

Lemma

None

Palea

None

Other structures

EmbryoEmbryo:
A rudimentary plant contained in a seed, usually consisting of a more or less differentiated axis and attached cotyledon(s).
is on flat side at base.

Identification notes

Corn comes in various types: popcorn, sweet corn, flour corn, flint corn, dent corn, and podPod:
A dehiscent fruit produced by leguminous plants (beans, peas). Also known as a legume.
corn. Most types produce a single color but others produce several colors on the same plant.

Noxious weed seed categories

Not listed

AOSA examination list

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Poaceae

Valid name

Zea mays L.

 Zea mays.  Caryopsis with the embryo on the flat side of the base. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Zea mays. Caryopsis with the embryo on the flat side of the base. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.