Wheat  Triticum aestivum (also known as T. vulgare).
[Commonly grown for flour today and substituted for Triticum dicoccum, the wheat in bible times, seldom grown today.]

In Christian symbolism barley and wheat sheaves represent the Body of Christ in the Sacrament of Holy Communion. Jesus referred to himself as the Bread of Life (John 6:35). Bread is also used to refer to all things necessary for this life Matthew 6:11). Unleavened bread, made without yeast, is often used as a figurative reference for purity.

Genesis 41, 42
Leviticus 2:1-16
Matthew 6:28-29
John 12:24