50 FOKESTS, WOODS, AND TKEES 



fastigiate form of the white poplar, resembling the Lombardy 

 poplar in shape, but distinctly wider with less upright 

 branches, has been recommended for streets ; but I have 

 never seen it used. It should be tried as it is a beautiful 

 tree in habit and shape, and succeeds well in Kew Gardens. 

 It would probably thrive in the north, as it comes originally 

 from Turkestan, where the winters are extremely severe. 

 The balsam poplar, with balsamic odour of foliage and buds, 

 occasionally seen in London streets, is Pojmhis candicans, 

 a female tree of unknown origin. It bears smoke well, but 

 is unsuitable for streets, as its suckers come up freely through 

 ordinary pavements. 



Ailantlms glandulosa, a native of China, is a fine tree 

 with magnificent pinnate foliage, which thrives and bears 

 smoke well in towns in the south of England. It does not 

 succeed, however, in Scotland or Ireland, where there is 

 not enough heat in summer for the well-being of this 

 species. 



Bohinia Pseiidacacia, an American tree, commonly but 

 erroneously called ' Acacia,' is a successful street tree, very 

 desirable on account of its pure white flowers and graceful 

 foliage, the latter remaining fresh and green even in the 

 driest summer. It suffers, however, much from wind, and 

 in Ireland, Scotland, and the west of England and Wales 

 should not be planted except in warm sheltered situations. 

 A form of this tree, known as var. JDecaisneana, which pro- 

 duces handsome pink flowers, and appears to be more 

 vigorous than the type, is well worth planting as a street 

 tree. Var. 'pyramidalis resembles the Lombardy poplar in 

 shape, and is also suitable for streets. 



The common ash, Fraxinus excelsior, thrives fairly well 

 in parks in London and other cities ; but it is unsuitable 

 for planting in streets, as its foliage is both late in coming 

 out in the spring and early in falling in autumn. It takes 

 up a great deal of space, aud has wide-spreading roots, so 

 that shrubs and other trees do not flourish in its immediate 

 vicinity ; and on this account it is not fit for town gardens. 

 Two of its varieties, the weeping asli (var. pcndida) and the 



