桑橙 (Maclura pomifera)  Osage orange, hedge apple, horse apple,
monkey ball, bois d'arc, bodark, or bodock
http://en.wikipedia.org/wiki/Maclura_pomifera

Osage orange Oklahoma, Texas, Arkansas, the Blackland Prairies, Post Oak Savannas, and Chisos Mountains of Texas. It has been widely naturalized
in the United States and Ontario. The largest Osage orange tree is located at River Farm, in Alexandria, Virginia, and is believed to have been a gift from
Thomas Jefferson.