A specialized type of achene characteristic of grasses where the seed coat is completely fused to the fruit wall, making them inseparable. This is the fruit type of all cereal grains like wheat, rice, and corn.
From Greek 'karyon' (nut, kernel) + 'opsis' (appearance), meaning 'nut-like in appearance.' The term was established in the 19th century as botanists recognized that grass 'seeds' were actually complete fruits fused with their seeds.
Every grain of rice, wheat, or corn you eat is actually a complete fruit - the caryopsis! The bran layer that's removed in white rice processing is actually the fruit wall fused to the seed coat, which explains why whole grains are more nutritious than their processed counterparts.
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