Ulmus rubra

Slippery elm is found in forest openings & edges, on rocky outcrops and mostly on calcareous soils. (NY Flora Atlas) Native to most of the eastern half of North America, it can get over 100 feet tall. The inner bark is a rusty red and slimy; it has been used medicinally historically and is still in use today. Unfortunately it is susceptible to Dutch elm disease, like the widely planted Ulmus americana.