Yeah, iirc there are only four original naturally-occurring citruses, of which one is inedible. All the rest are hybrids.

But they were all of them deceived, for another citrus was bred. In the sun-scorched groves of Barbados, in hidden orchards, Captain Shaddock labored in secret to create the grapefruit, that would outshine all citrus. And into this grapefruit they nurtured all their boldness, their ambition, and their desire to reshape the taste of life itself. One fruit to eclipse them all.