| Ulmus
americana
L. American elm, white elm Native |
                              
|
| Ulmus
glabra
Hudson Scots elm, wych elm Introduced |
  
|
| Ulmus
procera
Salisb. English elm Introduced |
 
|
| Ulmus
pumila
L. Siberian elm, dwarf elm Introduced |
                 
|
| Ulmus
rubra
Muhl. slippery elm Native |
       
|