Hardy rubber tree - Eucommia ulmoides
Common Name: hardy rubber tree
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.
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