Over time North America’s forests became a dense patchwork of different sylvan communities, each characterized by a unique topography and climate. As a whole, the deciduous forest was home to many different tree species—oaks, beeches, maples, basswoods, hickories, chestnut, ashes, elms, birches and poplars—but different types of trees predominated in different regions.

Ferris Jabr, “A New Generation of American Chestnut Trees May Redefine America’s Forests,” Scientific American, March 1, 2014