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Bitter orange, hardy orange, trifoliate orange, Japanese hardy-orange
The dwarf form with curved spines is called "Flying Dragon" and has sometimes been given the common name "pain and terror" See: http://articles.orlandosentinel.com/1988-09-06/news/0060420012_1_shivers-trifoliate-orange-pain-and-terror
= Citrus trifoliata
Rutaceae > The rue family.