The region of a flower stalk attached to flower parts is

A flower is borne on a stalk called the pedicel. At the tip of the pedicel, the stalk expands into a slightly swollen or flattened structure known as the receptacle (also called the torus or thalamus). The receptacle is the region where all the floral parts are attached.

The four main whorls of a flower - the calyx (sepals), corolla (petals), androecium (stamens), and gynoecium (carpels/pistil) - all arise from the receptacle. It provides the structural base that holds every part of the flower in position.

Understanding the distinction between the pedicel and the receptacle is important:

• The pedicel is the stalk itself that connects the flower to the main stem or peduncle.
• The receptacle is the enlarged end of the pedicel where the floral organs are inserted.

The corolla refers to the collective term for all petals, and the calyx is the collective term for all sepals. Neither of these is a region of the flower stalk.

Exam tip: Remember that the receptacle is the attachment point for all floral parts, while the pedicel is the stalk that carries the entire flower.