44 STREET AND HIGHWAY PLANTING. 



that the walnut is certainly not desirable for narrow streets, and if 

 useful at all, is best suited to broad highways on the edge of town. Here 

 it may develop to its greatest perfection and will not interfere in any 

 way. Many of the native walnuts appear as magnificent specimens, 

 which deserve great admiration. But an immense specimen may not 

 always look well when it is put in the artificial conditions of the parking. 



THE JACARANDA. 



The Jacaranda (Jacaranda mimoscefolia) is an ornamental tree 

 attaining perfection only in the coast cities of the south where the frost 

 is not severe. It bears large and delicate pinnate leaves and good sized 

 panicles of showy purple flowers in July and August. The growth of 

 the plant is inclined to be somewhat straggling and an occasional cor- 

 rective pruning may be necessary. Too heavy or too frequent pruning 

 will have the same effect as heavy frosts, namely, of removing the new 

 wood, which will produce the flowers for the following season. 



Owing to its small size this tree is suitable only for narrow streets or 

 for alternation with more rank-growing species which will provide 

 sufficient shade. As it has a tendency to form many leaders quite early 

 in life, nursery stock should be selected with care and watched that the 

 frost or other agencies do not kill the leader before it has reached a 

 sufficient height. 



Figure 16. 

 THE IRONWOOD. 



This tree (Lyonothamnus floribundus var. asplenifolius) (Fig. 16) 

 is a native of southern California in limited areas along the southern 

 coast islands. It is an evergreen species with large fernlike leaves of a 



