Hardy rubber tree - Eucommia ulmoides

Common Name: hardy rubber tree

Scientific Name: 
Family: Eucommiaceae
Genus: Ecommia
Species: ulmoides 

Hardiness Zone: 4b to 7
Height: 40 to 60 ft
Width: 25 to 35 ft

Description: ​​​​Hardy rubber tree, native to China, is known for being extremely drought tolerant while still retaining a deep green shine on its leaves. It has a dense silhouette, which combines with its rich color to make it a very attractive ornamental tree. It has an extremely high resistance to pests and diseases, and is being recommended more frequently as an optimal urban tree for its toughness and appearance. 

​References:
Gilmann, Edward F. and Watson, Dennis G.. "Hardy rubber 
                tree". USDA Forest Service. 1993. ​                                                http://hort.ifas.ufl.edu/database/documents/pdf/                  tree_fact_sheets/euculma.pdf