Citron
There are also a number of citron hybrids; for example, ponderosa lemon, the lumia and rhobs el Arsa are known citron hybrids, some are claiming that even the Florentine citron is not pure citron, but a citron hybrid.
Giovanni Baptista Ferrari
Ferrari was the first scientist to provide a complete description of the limes, lemons and pomegranates. He also described medical preparations, the details on citron and prescribed limes, lemons and pomegranates as medicinal plants against scurvy.