THE CULTIVATED POPLARS. 215 



sprout so much. This latter quality will be considered desirable 

 by growers of occasional specimens. On the other hand, it is not 

 so easily propagated as the common form and is perhaps, no hard- 

 ier, so that it will not supplant it for forest plantations where the 

 beautiful white, fine-grained wood of this species is desired, 

 and where the habit of sprouting from the roots is no drawback. 

 ' ' P. alba var. Bolleana is very different from the common white 



I I i ! 



i. WINTER TWIGS OF POPLARS. a, b, c, d, forms of Populus grandiden- 

 tata ; e, P. angustifolia ; f, P. nigra, var. elegans ; g, P. balsamifera, 

 var. latif olia (Nolestii] ; h, P. nigra (Eugenie] ; i, P. monilifera ; j, 

 P. laurifolia (Certinensis) ; k, P. balsamifera, var. viminalis ; 1, P. 

 nigra (form known as Canescens] ; m, P. alba, var. canescens ; n, P. 

 alba, var. nivea ; o, P. alba. 



poplar, which it resembles in foliage and bark, but its leaves are 

 nearly as deeply lobed as those of the common silver maple ; on 

 the upper side they are of a rich dark green color, while on the 

 lower side they have a very heavy coat of white down. Its 

 growth when young is nearly as upright as the L,ombardy poplar 

 with a tendency to a globular formed head when old. It is, how- 

 ever, a long lived tree even in severely dry sections in the West, 

 where the Lombardy poplar is worthless. It is of rather moder- 

 ate or slow growth. I find it much more difficult to propagate 

 than most other poplars, but have had fairly good success with 

 cuttings taken off in the fall, and well callused before planting. 



