Being a forester, I often get asked the question, "what kind of tree is that?" I usually don't have any trouble answering this question. But the other day I was asked to define what a tree is. When I began to answer, I suddenly realized that defining a tree isn't that simple. Before answering right away, I decided to think over the question. The following describes how I arrived at my definition of a tree.
Van Fosson, Greg
"What is a Tree?,"
Ames Forester: Vol. 70
, Article 8.
Available at: https://lib.dr.iastate.edu/amesforester/vol70/iss1/8