What forms the structure that holds the rest of the flower at the end of the pedicel?

The receptacle is the thickened part of the stem that holds and supports the flower. It serves as the base upon which the other floral organs—such as the sepals, petals, stamens, and carpels—are attached. This structural role is crucial, as it provides a stable platform for the various components of the flower to develop, facilitating reproduction. The receptacle not only supports the flower but may also play a role in nutrient transport during the development of the flower parts.

In contrast, the calyx refers specifically to the collective term for the outermost whorl of a flower, composed of sepals that protect the developing flower bud. The corolla is the collective term for the petals, which are often colorful and attract pollinators. The anther is part of the stamen, responsible for producing pollen, but it does not contribute to the structural support of the whole flower. Thus, the receptacle is the correct answer, as it specifically is the structure that holds the entire flower at the end of the pedicel.