The capitulum is considered the most derived form of inflorescence.[1] Flower heads found outside Asteraceae (such as those of Eryngium or Jasione) show lesser degrees of specialization.
 Diagram of a flower head. Note bracts surrounding the flowers, which would be absent on a capitulum. |
 Flower head of a common daisy (Bellis perennis) |
 Flowers open in succession in head of a sunflower (Helianthus annuus) |
 Close up of the ray corolla of a Hieracium lachenalii; every "petal" is actually a separate five-petaled flower complete with its own stamens and making its own fruit. |
References
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