What am I, an Encyclopedia? Oh, well, I looked it up for you. IronWood and Hop Hornbean are the same tree. Very hard wood, and used to make some tool handles. Dogwood is a different species, but also has a hardwood. Its the State tree for Virginia, and N. Carolina, and also for British Columbia, so it can be found throughout N. America. The Encyclopeida says that ironwood can grow to 40 feet in height.. I climbed an ironwood tree in my grandparents front yard as a kid in Chicago, so I will attest that at least in climates with adequate water, it is a tree, and not a bush or shrub.