in taxon citrus family grapefruit plant Citrus x paradisi Macfad. Citrus ×paradisi Macfad. (pro sp.) MANSFELD:7654 PLANTS:CIPA3 Citrus X paradisi Macfad. (pro sp.) Citrus paradisi Macfad. The grapefruit (*Citrus × paradisi*) is a subtropical citrus tree known for its sour to semi-sweet, somewhat bitter fruit. Grapefruit is a hybrid originating in Barbados as an accidental cross between two introduced species, sweet orange (*C. sinensis*) and pomelo or shaddock (*C. maxima*), both of which were introduced from Asia in the seventeenth century. When found, it was named the "forbidden fruit"; and frequently, it has been misidentified with the pomelo. The grapefruit's name alludes to clusters of the fruit on the tree, which often appear similar to that of grapes. [https://en.wikipedia.org/wiki/Grapefruit] citrus paradisi citrus x paradisi Citrus x paradisi requires discussion