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Fruitlover, when dealing with the public, everything is confusing, no matter what you start out saying!The genus name, Mangifera, means "mango-bearing". By definition, the fruit of a mango-bearing tree, is a mango.So something like, "This is a casturi, a rare species of mango, which is separate from the well-known India-type and Southeast-Asian-type mangos, that most people know," is about as clear as we can be.
It does seem slightly arbitrary to me to lump all mangos under the same scientific name of Mangifera Indica when SE Asian Mangos have defining charisteristics that are readily evident even to a layman (such as fruit shape and seed type). Seperate species have been created for less than that before and in my opinion it is worth at least a subspecies designation such as is given to yellow passionfruit.