Weeping European Beech - Fagus sylvatica var. 'Pendula'
Family: Fagaceae - Beeches, Chinkapins and Oaks
There are about 900 species in this family worldwide, about 65 trees and 10 shrubs of which are native to North America. The Oak genus, Quercus, inludes some of our most important native hardwoods, and are among some of the most-recognized trees in our nature-starved populace.

 
These weeping European beech are Morton Arboretum specimens.
Fagus, the beech genus, comprises ten species of deciduous trees native to temperate Europe, Asia, and North America.

In the Northern and Central States, beech flowers appear in late April or early May when the leaves are about one-third grown; the species is monoecious. The flowers are quite vulnerable to spring frosts. Male flowers occur in long-stemmed heads; female flowers in clusters of two to four (40). Beechnuts require one growing season to mature and they ripen between September and November. Two or (rarely) three nuts may be found within a single bur. The first nuts to fall are usually wormy or aborted. Seed fall begins after the first heavy frosts have caused the burs to open and is completed within a few weeks. Some empty burs remain on the trees throughout the winter.

Beech trees prune themselves in well-stocked stands. Open-grown trees like the specimen pictured above, however, develop short, thick trunks with large, low, spreading limbs terminating in slender, somewhat drooping branches that form a broad, round-topped head.

European Beech is recommended for use in public areas.  Makes an excellent hedge because of its ability to withstand heavy pruning.  It is better adapted to growing conditions than the native American Beech.   This cultivar is a slow grower - many years to produce good shade. It can be adapted to  bonsai. 
(United States Department of Agriculture NRCS Plant Fact Sheet)