EVERGREEN TREES. 183 



fern-like in the arrangement of its small branches. While 

 young it is compact and very beautiful, but as it reaches 

 maturity it becomes more open and irregular in growth, 

 though it still retains much of its beauty. 



JAPANESE THREAD-LIKE CYPRESS (R. filifera). More 

 beautiful than the last and equally hardy. It is of light 

 green color with thread-like terminal branches and very 

 graceful and perfect in form. One of the most desirable of 

 evergreens of medium size. 



AMERICAN ARBOR- VIT^; (Thuya occidental i*]. A na- 

 tive tree of beautiful form and color while young, but soon 

 becomes irregular and tends to lose its lower branches as it 

 increases in age. It has produced a great many beautiful 

 forms, some of which are much more valuable than the 

 original type. It should not be planted where there is very 

 great exposure to prevailing winds or where teams, persons, 

 or animals will come in contact with it during the winter 

 when the branches are frozen, for nothing is more destruc- 

 tive to its beauty than contact in zero weather. Among 

 the most valuable varieties are the following: 



SIBERIAN ARBOR-VIT.E (T. o., var. Siberica), Fig. 94. 

 Compact, dwarf, conical in form, of a much darker 

 green than most of the varieties, and it takes on less of the 

 brown color during the winter than any other form of the 

 species; especially valuable for hedges. 



PYRAMIDAL ARBOR-YIT^E (T. o., var. pyramidal is). 

 Of close, compact, pyramidal form, it serves a good purpose 

 w^here small columnar trees are desired. It is of about the 

 same color as the original type of the species. 



GLOBE ABBOR-YIT^E (T. o., var. globosa). Compact 

 and globular in form, of a dark green color, and valuable 

 for low hedges or for small, low, round-headed trees. 



