THE ORNAMENTAL PLANTS — TREES 327 



Lombardy poplar, P. nigra, var. Italica. 



Desirable for certain purposes, but used too indiscriminately (p. 41); it is 

 likely to be short-lived in northern climates. 



White poplar, abele, P. alba. 

 Sprouts badly; several forms. 



Bolle's poplar, P. alba, var. Bolleana. 



Habit much like the Lombardy ; leaves curiously lobed, very white beneath, 

 making a pleasant contrast (p. 218). 



Certinensis poplar, P. laurifolia (P. Certinensis). 



A very hardy Siberian species, much like P. ddtoides, useful for severe 

 climates. 



Wild black cherry, Prunus serotina* 

 European bird cherry, P. Padus. 



A small tree much like the choke cherry, but a freer grower, with larger 

 flowers, and racemes which appear about a week later. 



Choke cherry, P. Virginiana.^ 

 Very showy while in flower. 



Purple plum, P. cerasifera var. atropurpurea (var. Pissardi), 

 One of our most reliable purple-leaved trees. 



Rose-bud cherry, P. pendula {P. subhirlella) . 



A tree of drooping habit and beautiful rose-pink flowers preceding the 

 leaves. 



Japanese flowering cherry, P. Pseudo-Cerasus. 



In many forms, the famous flowering cherries of Japan, but not reliable 

 North. 



There are ornamental-flowered peaches and cherries, more curious and 

 interesting than useful. 



Wild crab, Pyrus coronaria^ and P. loensis.* 



Very showy while in flower, blooming after apple blossoms have fallen; 

 old specimens become picturesque in form. P. loensis flore plenot (Bechtel'a 

 Crab) is a handsome double form. 



Siberian crab, P. baccata.X 



Excellent small tree, both in flower and fruit. 



