Liberty Trees Were Key by Trees Are Key published on 2019-07-03T15:17:49Z Trees Are Key We talked about how Famous Trees Are Key way back in episode 11… and featured several of our Famous Trees of Texas in our spotlight, but did you know that trees featured in the American Revolution and our quest for independence? Since this episode drops on Independence Day, it just seems fitting to explore Liberty Trees. Species Spotlight American elm (Ulmus americana) has a very extensive natural range, from the Western Plains to the Gulf Coast to the Atlantic Northeast. In fact, it is the state tree of Massachusetts and North Dakota. American elm is adaptable to a variety of sites, from uplands to wet bottomlands to harsh urban environments.