description
Zea mays, a member of the Poaceae family, is often 2.5 m (meters) (8 ft) in
height, though some natural strains can grow 12 m (40 ft). The stem has the
appearance of a bamboo cane and is commonly composed of 20 internodes of 18
cm (7 in) length. A leaf grows from each node, which is generally 9 cm (3.5
in) in width and 120 cm (4 ft) in length.
Ears develop above a few of the leaves in the midsection of the plant, between
the stem and leaf sheath, to a length of 18 cm (7 in). They are female
inflorescences, tightly enveloped by several layers of ear leaves commonly
called husks. The apex of the stem ends in the tassel, an inflorescence of male
flowers. When the tassel is mature and conditions are suitably warm and dry,
anthers on the tassel dehisce and release pollen. Maize pollen is anemophilous
(dispersed by wind), and because of its large settling velocity, most pollen
falls within a few meters of the tassel.
Elongated stigmas, called silks, emerge from the whorl of husk leaves at the end
of the ear.
They are often pale yellow and 7 in (178 mm) in length, like tufts
of hair in appearance. At the end of each is a carpel, which may develop into a
"kernel" if fertilized by a pollen grain.
The pericarp of the fruit is fused
with the seed coat referred to as "caryopsis", typical of the grasses, and the
entire kernel is often referred to as the "seed". The cob is close to a multiple
fruit in structure, except that the individual fruits (the kernels) never fuse
into a single mass. The grains are about the size of peas, and adhere in regular
rows around a white, pithy substance, which forms the ear. An ear commonly holds
600 kernels. They are of various colors: blackish, bluish-gray, purple, green,
red, white and yellow. It is in flower from July to October, and the seeds ripen
from September to October.
common names & nomenclature
The word maize derives from the Spanish form of the indigenous Taíno word for the plant, maiz.
Also known as:
corn, maize, cornsilk, corn silk, yu mi shu, indian corn, sweet corn