Which plant produces allspice in the myrtle family?

The plant that produces allspice is Pimenta dioica, a tropical evergreen tree belonging to the myrtle family (Myrtaceae) within the order Myrtales.1

While the name "allspice" is sometimes applied to other aromatic shrubs—such as the Carolina allspice, Japanese allspice, or spicebush—Pimenta dioica is the source of the true culinary spice. Native to the West Indies and Central America, the tree produces berries that are harvested before they are fully ripe and dried to create the aromatic spice.1