Where is thalamus located in flower?

Think of the thalamus as the "hub" of a flower. All the main organs—petals, stamens, carpels—are borne on it. It’s usually enlarged and sometimes takes special shapes depending on the plant species.

In botany, the thalamus (also called receptacle) is located at the very base of the flower. It’s the swollen end of the pedicel where the floral parts like sepals, petals, stamens, and carpels are attached.

To simplify: if you look at a flower diagram, the thalamus is the part that holds everything together at the bottom. Without it, the flower organs wouldn’t have a base to attach to.