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The oroblanco (Citrus maxima × C. Paradisi) is a sweet seedless citrus hybrid fruit. It was developed as a cross between a diploid acidless pomelo and a seedy white tetraploid grapefruit, resulting in a triploid seedless fruit that is less acidic and less bitter than the grapefruit. The oroblanco was patented by the University of California in 1981 after its development at the university's citrus experiment station by Robert Soost and James W. Cameron. Oroblancos are either round- or oval-shaped with a thicker rind than grapefruit. The fruit is available from September through December and can be peeled and eaten like an orange. A similar fruit named the "sweetie" has been commonly cultivated in Israel since 1984. This photograph shows oroblancos grown in Israel, one whole and one sectioned. The picture was focus-stacked from 12 separate images.Photograph credit: Ivar Leidus