Plural of capitulum; small head-shaped structures or dense flower clusters found in plants like daisies and sunflowers.
From Latin 'capitulum,' a diminutive of 'caput' (head). The term was used in botany to describe the round, head-like flower clusters of composite plants (Asteraceae family).
What looks like a single daisy flower is actually hundreds of tiny flowers packed into one head-shaped cluster—those are capitula! This arrangement is so efficient that plants in the daisy family (Asteraceae) now make up about 10% of all flowering plants on Earth.
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