Head
A head is similar to an umbel, but the flowers are sessile, and crowded together on a reduced or abbreviated mother-axis which is called the disc. It is sometimes flat, more frequently dilated and convex or conical. The head is subtended by a number of small scaly, overlapping barren bracts, together forming the involucre. A head is also known as a capitulum.
Credit: http://www.csdl.tamu.edu/FLORAgallery.html
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