We had a "Tree" in the back yard which we did not plant. Leaves are about 8 inches in length and about 3 inches wide, very waxy. The roots look like extremely long carrots. The largest was about 4 inches in diameter at the base, and a half inch at the end, about 15-20 feet long. Further they're a yellowish orange color which aids in the carrot-like appearance. Any ideas what it might be? We took out 3 dozen or so of the roots while I think we got it all however, I can't really be sure.
We're in South Florida USA if that helps.
Some googling has brought up the carrotwood species but I can't find any pictures of its root system.