Citrange
Encyclopedia
The citrange is a hybrid of the sweet orange and the trifoliate orange
Trifoliate orange
Trifoliate Orange, Poncirus trifoliata , is a member of the family Rutaceae, closely related to Citrus, and sometimes included in that genus, being sufficiently closely related to allow it to be used as a rootstock for Citrus...

. The purpose of this cross was to attempt to create a cold-hardy citrus
Citrus
Citrus is a common term and genus of flowering plants in the rue family, Rutaceae. Citrus is believed to have originated in the part of Southeast Asia bordered by Northeastern India, Myanmar and the Yunnan province of China...

tree with delicious fruit. However, citranges are generally bitter.
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