Almost all citruses - the orange, lemon, grapefruit, clementine, etc. - are hybrids of three original citrus species: the pomelo, mandarin, and citron. Most often, we represent genealogy as a tree, but the complex hybridization process that led to modern citrus would render more of a complex, incestual web. It does, however, lend itself to another representation: a ternary plot. Each corner represents one of the original species, and the closer the fruit is to that corner, the higher percentage it is of that species - press on any individual node to see its exact genetic distribution.
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