SOURCE: DAVID KARP, University of California, Riverside No other fruit genus can boast such pedigree, and new research is bringing clarity to the origin of citrus. Grapefruits are a human ...

They grow in tropical and subtropical climates and belong to the Citrus genus. These are a few fruits that come in the criteria: Clementine Grapefruit Lemon Lime Mandarin Orange Pomelo Tangerine ...