PLANTING 157 



conditions of acclimatization. This predominat- 

 ing impression may be secured through the filler 

 shrubs. 



It is interesting to note that the contours of na- 

 tive trees generally harmonize with the topogra- 

 phy of the locality in which they are found, the 

 long axis of the foliage being parallel with the pre- 

 vailing lines of the landscape. Thus the wide- 

 spreading sycamore is found growing naturally on 

 the plains, but the vertical, jagged cypress is thor- 

 oughly characteristic of the rocky hillsides of 

 Italy. If either of these trees were to be found in 

 the habitat of the other, it would serve as a most 

 striking accent. The same tree may often be used 

 in different ways in one planting scheme. For ex- 

 ample, the highly individual shape of the Lom- 

 bardy poplar compels attention when the tree is 

 used singly or in groups of two or three ; but it also 

 may be planted so close together for use as a screen 

 that the individual tree forms are merged, and all 

 indication of accent is lost. The use of poplar- 

 trees as accents is very noticeable upon the plains 

 of France. 



The harmonization of plant forms with geologi- 

 cal structure is even carried to extremes by na- 

 ture under unusual conditions. In the volcanic 



