>We call tangerines - mandarines. BTW, melons and cantaloupes we call by a collective name of "bostan" - do you have any idea why? The word sounds Turkish to me.

We call as tangerines as mandalina... :)
Bostan!.. We have a lot of collective words. We call melon (karpuz) and cantaloupe (kavun) fields as "bostan" ... :)