Britannica
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Which Asteraceae plants have discoid flower heads?
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Asterales
True, or English, daisy (Bellis perennis).
In the Asteraceae family, a discoid head is defined by the presence of only disk flowers, which feature regular, tubular corollas rather than the strap-shaped rays found in other types of inflorescences. These flowers are typically perfect (bisexual) and fertile.
Common examples of Asteraceae species that possess discoid flower heads include:
These plants are distinct from those with radiate, disciform, or ligulate heads, which contain different arrangements or types of florets.1