Code of Federal Regulations Title 7. Agriculture § 7.905.4 Fruit

(a) Citrus sinensis, Osbeck, commonly called “oranges”;

(b) Citrus paradisi, MacFadyen, commonly called “grapefruit”;

(c) Citrus reticulata, commonly called “tangerines” or “mandarin”;

(d) Citrus maxima Merr (L.);  Osbeck, commonly called “pummelo”;  and,

(e) “Citrus hybrids” that are hybrids between or among one or more of the four fruits in paragraphs (a) through (d) of this section and the following:  Trifoliate orange (Poncirus trifoliata), sour orange (C. aurantium), lemon (C. limon), lime (C. aurantifolia), citron (C. medica), kumquat (Fortunella species), tangelo (C. reticulata x C. paradisi or C. grandis), tangor (C. reticulata x C. sinensis), and varieties of these species. In addition, citrus hybrids include:  Tangelo (C. reticulata x C. paradisi or C. grandis), tangor (C. reticulata x C. sinensis), Temple oranges, and varieties thereof.