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Citrumelo (× Citroncirus spp.) is also called Swingle citrumelo trifoliate hybrid, because it is cold hardy and is a hybrid between a 'Duncan' grapefruit and a trifoliate orange (Poncirus trifoliata Raf.), developed by Walter Tennyson Swingle.
Citrumelo: × Citroncirus ssp. Citrumelo is also called Swingle citrumelo trifoliate hybrid, because it is cold hardy and is a hybrid between a 'Duncan' grapefruit and a trifoliate orange, developed by Walter Tennyson Swingle. Clementine: Citrus × clementina
Citrumelo: Citrus × paradisi × Citrus trifoliata: −15 °C (5 °F) Semi-edible 'Dunstan' is considered the most edible citrumelo Kabosu: Citrus cavaleriei × Citrus x aurantium: −12 °C (10 °F) Edible, Used in cooking Long cultivated in Japan Shuangjuan (Ichang lemon) Citrus cavaleriei × Citrus maxima: −12 °C (10 °F) Edible, Used in ...
Swingle citrumelo: tolerant of tristeza virus and Phytophthora parasitica and moderately resistant to salt and freezing. [2] This rootstock selection was hybridized from the Duncan grapefruit ( Citrus paradisi Macfadyen ) and the Poncirus trifoliata (L.) Raf. by Walter Tennyson Swingle in Eustis, Florida, in 1907.
The group includes the citrange, a hybrid between the trifoliate and sweet oranges, and the citrumelo, a hybrid of trifoliate orange and 'Duncan' grapefruit. As with Citrofortunella, were Poncirus subsumed into Citrus, these hybrids would no longer be intergeneric, and would likewise fall within Citrus, rendering Citroncirus invalid.
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In the Swingle system, where the trifoliate orange is placed in Poncirus, a hybrid genus name has been coined for these intra-generic crosses, "× Citroncirus". The most notable of these are the citrange, a cross between the trifoliate and sweet oranges, and the citrumelo, a hybrid of trifoliate orange and 'Duncan' grapefruit.
The citrange (a portmanteau of citrus and orange) 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 (which is the nature of a trifoliate), with delicious fruit like those of the sweet orange. However, citranges are generally bitter.