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.
Citrus × deliciosa
Citrus" × "deliciosa (thorny (Australia), amarillo, beladi, "Willowleaf Mandarin", "Mediterranean Mandarin") is a citrus hybrid mandarin orange with just under 6 % pumelo ancestry. It is related to the ponkan.