It’s the branch of a tree, but this tree is no good for a tree house. Take a look at the thorns, which can be found up and down the trunk, and also potently arming the branches. You won’t be inclined ...

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.

Trees may look passive, but they’re equipped with complex defense systems honed over millions of years. Many species release toxic compounds, bitter sap, or airborne chemicals to deter insects and ...