On what grounds are plants grouped into the families of bluegrass (cereals)?

Cereals are characterized by several main characteristics:
have a fibrous root;
long leaves;
thin straw-shaped stems with hollow internodes;
flowers are collected in ears.
Cereals can have different inflorescences. So, spike-shaped crops include such crops as: barley, wheat, rye. Paniculate inflorescence cereals include rice, millet and oats. In corn, the inflorescence is cob-shaped.

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