There are several kinds of trees in the Skiatook area that have thorns. This note describes four of them. Black locust, Callery pear, chittamwood and Osage orange.

Browsing antelope turned ancient African forests into grassy savanna ecosystems Study of thorn trees in African savanna reveals astonishing comparisons to the evolution of thorns and the arrival ...

A question for Dan Gill: I just planted a 3-foot Meyer lemon tree. How do I keep it from growing thorns? Any other tips would be appreciated. -- Pam Barron Answer: All of the citrus trees we grow ...