A grain is a small, hard, dry seed, with or without an attached hull or fruit layer, harvested for human or animal consumption.[1] A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and legumes. The term specifically refers to seeds of plants of the grass family, such as wheat, corn, and rice; seeds of non-edible grass species are also often called `grains.`In the clubmosses, with different evolutionary origins, the leaves are simple with only a single vein and are known as microphylls
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