Plural form of cypsela, referring to multiple single-seeded fruits characteristic of the daisy and sunflower family.
Direct Latin plural of cypsela (Greek kypsele + Latin -ae plural), maintaining the classical Latin botanical terminology used since Linnaeus standardized plant nomenclature.
Sunflower heads contain hundreds of cypselae arranged in a mathematical spiral pattern called the Fibonacci sequence—this arrangement maximizes seed packing and is so efficient that engineers study sunflower seed patterns to optimize solar panel arrangements.
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