POPLAR. 259 



the leaves. A very hardy tree or shrub of graceful habit attain- 

 ing a height of twenty feet. More difficult to propagate than 

 most willows, and occasionally blights severely. 



Salix purpurea pendula. (S. na^oleonis.} Napoleon 

 Willow. 



Leaves one and one-half to two inches long, linear, finely 

 serrate, green and shining above, dull bluish green beneath; 

 petioles short. Young twigs and petioles reddish. A spreading 

 shrub, but when top-worked on an upright stock forms a very 



. -s^ 

 Figure 54. Napoleon Willow, top-worked on White Willow. 



pretty tree, with spreading pendulous branches. Hardy at the 

 Minnesota Experiment Station. Known among nurserymen as 

 New American Willow, but often worked on too tender stocks. 



Genus POPUI/US. 



Leaves alternate, broad, more or less heart shaped or ovate. 

 Flowers dioecious. Individual trees bearing staminate and pis- 

 tillate catkins, and also catkins having the two kinds of flowers 

 mixed together occasionally occur. Flowers appear before the 

 leaves in long, usually drooping, lateral, cylindrical catkins, the 

 scales of which are furnished with a fringed margin; the calyx 

 is represented by an oblique cup-shaped disk, with entire mar- 

 gin; stamens usually numerous; ovary short; stigmas long, two- 

 lobed; fruit described under family Salicacea, ripening before the 



