The grains are all members of the grass family, and the edible portion is the seed.
The plant belongs to the grass family and much resembles maize before the latter has matured.
Such are silica in the stems of the grass family, lime and magnesia in the bones of animals, iron in blood, and many others.
And corn belongs to the grass family, too, and corn is an Endogen, for it has a big pith instead of rings.
But in the grass family or Gramineæ the cereals, sugarcane and bamboos are also included.