I bought this tree and they were not sure what it was. It has no thorns and the leaves look like my navel orange tree.  It produced light orangeish yellow fruit the size of oranges and when I ate one that fell off the tree it tasted like a grapefruit. The flesh is not red or even pink.  Clearly grapefruit in taste.  I want to know what kind of grapefruit or orange tree this might be.  I have it in a 30 gallon pot.  Maybe its a grapefruit that just made little ones but the tree isn't overloaded. It only had 6.