Citrus paradisi Macfad. RUTACEAE
Received as budwood from South Africa, 1985.
6/1989 Letter from Ian Gilfillan to W.P. Bitters (dated 8/30/82) states that Rex Union is believed to be a natural hybrid of Seville orange and shaddock.
Rootstocks of accession
Carrizo citrange, Citrus macrophylla
Season of ripeness at Riverside
Notes and observations
Discovered in about 1930 in South Africa. Not grown on a commercial scale. Few trees seen are not very vigorous and roundish in shape. Fruit is large, like grapefruit, and roundish in shape; the external color is a reddish-orange. This cultivar makes top quality marmalade; it is not eaten as fresh fruit. Makes excellent marmalade. The marmalade is ease to make because there are few seeds and it is not necessary to peel the fruit, but it is simply cut into pieces and boiled in a sugar and water mixture. (Info. from A.T.C. Lee)