Use google.
Put "slippery elm leaves" into the search window and then look over the results.
These links show images of Slippery Elm (Ulmus rubra) tree leaves and branches.
http://t3.gstatic.com/images?q=tbn:ANd9G...
http://www.carolinanature.com/trees/ulru...
http://www.extension.iastate.edu/forestr...
http://www.slipperyelmbarktea.com/images...
http://toddcaldecott.com/herbs/slippery-...
what does slippery elm tree leaves and branches look like