The pomelo ( POM-il-oh, PUM-; Citrus maxima), from the family Rutaceae, is the largest citrusfruit, and the principal ancestor of the grapefruit. It is a natural, non-hybrid, citrusfruit, native to Southeast Asia. Similar in taste to a sweet grapefruit, the pomelo is commonly consumed and used for festive occasions throughout Southeast Asia. As with the grapefruit, phytochemicals in the pomelo have the potential for drug interactions.