discoid head

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The discoid head of the globe thistle (Echinops), which is composed of only disk flowers.

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discoid head

plant anatomy

Learn about this topic in these articles:

Asteraceae

In Asteraceae: Flowers
The simplest type is the discoid head, in which the flowers have a regular, tubular corolla, with generally four or five apical teeth representing the tips of the petals. This kind of flower is called a disk flower. Ordinarily, the flowers in a discoid head are all perfect (bisexual) and…
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