88 



OHIO EXPERIMENT STATION: BULLETIN 190 



grows somewhat slowly when young-, the rate of growth is more rapid in later 

 years, so that trees twenty-five years old ought to be fifteen to twenty feet high. 

 In Japan umbrella pines one hundred feet high are by no means uncommon, but 

 trees of this size are undoubtedly very old Where one wishes to cultivate on his 

 lawn a rare evergreen of peculiar,yet attractive and satisfactory, habit of growth, 

 no mistake will be made in securing a specimen of the umbrella pine. 



FIG. VII Dwarf Mu^ho 'Pln^Ptnus fumtlio Haenke. 



Dwarf Mugho Pine. Pinus pumilio Haenke. The Mugho pine is a low-grow- 

 ing species originally found upon the mountains of Central Europe. Specimens 

 occasionally attain a height of twenty-five feet, but as generally seen it is a 

 tree of low, sprawling character seldom more than five or six feet tall. Its 

 peculiar spreading habit, together with dense, dark green foliage and assured 

 hardiness, make it of great service in ornamental planting. It shows especially 

 well when planted near to rocks or upon a rocky ledge, and individual trees are 

 attractive on the lawn, if located well in the foreground or planted in front of 

 taller evergreens. 



Norway Spruce. Picea excelsa Link. In discussing the Norway spruce, 

 which has been so abundantly and widely planted through the northern half of 

 the United States, the authors feel that they are dealing with a tree already 

 thoroughly well known to most readers. Owing to its rapidity of growth and 



