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How does flowering progress from the outside toward the center of an Asteraceae flower head?
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Asterales
True, or English, daisy (Bellis perennis).
In the Asteraceae family, the sequence of flowering within an individual flower head is always centripetal, a characteristic feature of a racemose (indeterminate) inflorescence.1
This means that the flowers located on the outermost edge of the head bloom first. Following this, the flowering progresses in a spiral pattern toward the center of the head.1