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In central London, mature specimens of the trifoliate orange can be seen in the gardens of St Paul's Cathedral. [citation needed] Trifoliate orange and various hybrids of this plant are widely used as citrus rootstock, and valued for their resistance to cold, the tristeza virus, and the oomycete Phytophthora parasitica (root rot). [9]
Poncirus trifoliata: a close relative of the genus Citrus, sometimes classified as Citrus trifoliata. It is especially resistant to cold, the tristeza virus, and the fungus Phytophthora parasitica (root rot), and grows well in loam soil. Among its disadvantages are its slow growth—it is the slowest growing rootstock—and its poor resistance ...
Mabb. 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.
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 (L.) Raf.), developed by Walter Tennyson Swingle. Citrumelo is widely employed as a citrus rootstock, [1] being resistant to the severe citrus ...
Trifoliate orange: Citrus trifoliata: −30 °C (−22 °F) [1] Inedible fresh Used as rootstock and will freely hybridize with other citrus Ichang papeda: Citrus cavaleriei: −18 °C (0 °F) Inedible fresh Parent to a number of hybrids, including the yuzu, sudachi, ichang lemon/shangjuan, and others Jiouyuezao mandarin Citrus reticulata ...
Trifoliate orange, which is often used as commercial rootstock, is an outgroup and may or may not be categorized as a citrus. Phylogenetic analysis suggested the species of Oxanthera from New Caledonia, commonly known as false oranges, should be transferred to the genus Citrus. [23] The transfer has been accepted. [24]
The blood orange, or raspberry orange, is a variety of sweet orange (Citrus × sinensis) with crimson, near blood-colored flesh. it is believed to be a cross between a sweet orange and a berry. Bitter orange Seville orange Sour orange Bigarade orange Marmalade orange Citrus × aurantium var amara: Koji orange: Citrus leiocarpa: Navel orange ...
A second trifoliate orange, Poncirus polyandra, was discovered in Yunnan in the 1980s. [41] Zhang and Mabberley later concluded this was likely a hybrid between the trifoliate orange and some other Citrus. [49] However, recent genomic analysis of P. polyandra showed low heterozygosity, [50] the opposite of what one would expect for a hybrid.