Britannica Sources used in this answer

Which Asteraceae tribe contains most plants with ligulate flower heads?

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Sunflower — Asteraceae The flowering head of a sunflower (*Helianthus annuus*) is formed of yellow, petal-like ray flowers and a brown center of minute disk flowers.

Within the Asteraceae family, the tribe that contains plants with ligulate flower heads is Lactuceae (also known as Cichorieae).1

While other types of flower heads—such as radiate, discoid, and disciform—can be found across various tribes of the family, the ligulate head is almost entirely restricted to the Lactuceae tribe and is a characteristic feature of all its members. These heads consist exclusively of ligulate flowers, which are perfect (bisexual) and feature a strap-shaped corolla representing all five lobes of the flower. A familiar example of a plant with this type of head is the dandelion.1