Citrange

The citrange is a citrus hybrid of the sweet orange and the trifoliate orange.
The purpose of this cross was to attempt to create a cold hardy citrus tree, with delicious fruit like those of the sweet orange. However, citranges are generally bitter.
Citrange is used as a rootstock for citrus in Morocco, but does not prevent dry root rot or exocortis disease.

Cultivars

There are several named citrange cultivars, including the 'Carrizo' citrange and the 'Troyer' citrange. Both resulted from a hybrid between the trifoliate orange and the Washington navel orange. There is also a cultivar called 'Rusk' which resulted from a cross between a Ruby orange and a trifoliate orange.