I took forestry in high school for 2 years, and all i know about this tree is it is some kind of Pear, and deer mutilate it....

I noticed the seemingly highly educated tree people in Gmmat's thread so i thought i would question my own. What you cant see obviously is the fruit which is a small orange colored fruit about the size of a pinball maybe slightly larger. the buds are sharp thorn like and the pics will have to do the rest of the explaining... what kind of tree is this??