Term:

Articulation
Definition:

A joint between two separable parts, e.g., between a leaf and a stem or between a lower and upper part of a pedicel,
Notes:

In Lecythidaceae, articulation is used to refer to a joint on the pedicel/hypanthium. In this family, it is difficult to distinguish the pedicel from the hypanthium so they are sometimes collectively referred to as the pedicel/hypanthium.