46 THE BOOK OF SHRUBS 



While very effective grown as single specimens on the 

 lawn, P. floribunda and P. malus and their varieties 

 appear to the greatest advantage when arranged in small 

 groups in the shrubbery. P. baccata and P. spectabilis 

 are equally adapted for lawn specimens and the shrub- 

 bery. They will thrive in all descriptions of soil, and 

 can be readily propagated by means of budding and 

 grafting. 



ROBINIAS. These constitute an ornamental and useful 

 group of trees, but only two of the species have much 

 value for the beauty of their flowers. These are the 

 Rose Acacia (R. hispidd) and the Mexican Locust 

 (R. neo-Mexicana), both of which have racemes of 

 rose-coloured flowers, but are quite distinct. They 

 have elegant leafage, and attain a height of eight or 

 more feet. They present an attractive appearance, 

 whether grown singly or in groups, but in small 

 gardens single specimens will be preferable. Plants 

 from layers should be selected because of the risk of 

 grafted plants having their heads blown out open by 

 rough winds. 



