Rock Elm - Ulmus thomasii
As much as 80 feet tall, with a straight trunk and a narrow or elliptical crown, Rock Elm is a northern species, growing in the Great Lakes region east to Vermont, with some populations in Tennessee. The common name comes from the very hard wood. It grows on dry sites, including habitats that vary from slopes to flatlands. The leaves are about 4 inches long, glossy above and doubly-toothed. The flowers are small, bell-shaped, and the fruit is a rounded samara. Slow-growing, Rock Elm is susceptible to Dutch elm disease and was heavily harvested in the past.