A delightful, uncommon shade tree sporting impeccable deep green glossy foliage on a rounded to broad-spreading canopy. The graybrown bark is ridged and furrowed and much valued for its medicinal properties in its native China. Its namesake is derived from the 3% rubber content present in the bark. Plants are vigorous when young, becoming moderate growers with age and can be expected to reach perhaps 30' tall in 20 years. They are adaptable to a range of conditions including high pH soils and urban environments.