Definition - What does Capitulum mean?
In botany, the capitulum refers to a compact, short, and dense cluster of stalkless flowers that are attached directly at the base. Popular examples of capitula include broccoli, cauliflower, and clovers. The individual flowers found in each cluster are known as florets. Capitulum may take on various forms and the florets tend to be on the smaller side.
MaximumYield explains Capitulum
Some florets can grow to be quite large as is often the case with specific varieties of sunflowers. According to botanists, the capitulum is a type of compound inflorescence that is commonly seen in the Asteraceae family. There are over 22,00 species of capitula. Thistles, daisies, dandelions, and sunflowers are comprised of thousands of flowers grouped together to form a single organism.
In certain cases, the pseudanthium may be indistinguishable from flowers, at least on a superficial level. However, these inflorescences have reduced reproductive units that function just like single flowers during pollination.