What fruit is a hybrid of a mandarin orange and a grapefruit or pummelo?
Tangelos; are deliberate or accidental hybrids of any mandarin orange and the grapefruit or pummelo. The first known crosses were made by Dr. Walter T. Swingle at Eustis, Florida, in 1897, and Dr. Herbert J. Webber at Riverside, California, in 1898. They are so unlike other citrus fruits that they have been set aside in a class by themselves designated Citrus X tangelo J. Ingram & H. E. Moore (C. X paradisi X C. reticulata).
