CITRANGE, the hybrid tree and its fruit produced by cross ing any variety of the sweet orange (Citrus sinensis) with the trifoliate orange (Poncirus tri f oliata). At various times since 1892 American citrologists have endeavoured to produce some form of Citrus which would endure freezing temperatures. Several thousand seedling plants raised from cross-fertilized fruits, using both of the aforementioned species as "pollen parents," have been tested. In 1928 only five of these were citranges of cultural im portance. While some citranges closely resemble oranges, all are inferior to the orange in flavour. They endure considerable frost and are used in place of lemons in various drinks and in cookery.
Citrangequats, three-parent crosses made by hybridizing a kumquat with a citrange, are grown in the United States, several named varieties of these highly coloured (orange-yellow to flame scarlet) lime-like fruits being in cultivation.