The perfect specimen waifu!
Literally made for fruity harems!
Mangosteen trees are dioecious, meaning that there are male trees and female trees. The only problem with this is that to date, no one has been able to find a male tree anywhere in the world so if they exist, they are quite rare. Globally, it is possible that there have never been any male mangosteen trees. This places the entire burden on the female tree to perpetuate the species. No males means no pollen, even though the female flower contains rudimentary sterile anthers where pollen would normally be found. Without pollen, there is no way to fertilize the female flower and create true seeds with variable genetic traits. Instead, the female mangosteen trees succeed in perpetuating the species by a process known as apomixis or agamospermy. The wall lining the ovary of the female flower, the nucellus, supplies the material that will then develop within the fruit segments and becomes what is effectively an asexually produced seed. As a result of this, it produces a clone of the mother tree.
Since there is no pollen source and therefore no sexual fertilization, there is no crossing and mixing of the genes that would provide a means for variety development and selection. It can take place but will require lab techniques to manipulate the movement of genetic material within the nucleus and other structures of the cell. This feature in plants is not all that rare. Lawn grass seeds results from this kind of 'seed' production and it is a benefit where uniformity is desired.