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How does a sunflower head contain many individual flowers?
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Plant reproductive system
A large bumblebee (Bombus species) pollinating a teasel flower head (Dipsacus species).
A sunflower head is not a single flower, but rather an inflorescenceβa cluster of many small, individual flowers arranged on a common receptacle. This specific type of inflorescence is known as a capitulum, or head, which is characteristic of the Asteraceae family.12
Within this head, the individual flowers are arranged in a spiral pattern, with the youngest flowers located at the center. These flowers can vary in type:1
- Ray flowers: These are the marginal, tonguelike flowers that often appear as petals around the edge of the head. They are typically sterile or female.1
- Tubular flowers: These occupy the central portion of the head. They are characterized by both male and female reproductive parts, including five stamens and a pistil, and they eventually mature into one-seeded fruits called achenes.1
By grouping these many small flowers together, the sunflower creates a display that functions visually as a single, large blossom to attract pollinators.31