POPLAR. 



265 



forms of this are known to horticulturists as P. Noksti and P. 

 Wobsky. 



Populus angustifolia. Narrowleaf Cottonwood. 



Leaves lanceolate or ovate-lanceolate, narrow at base, green 

 on both sides; branches rather 

 slender with smooth bark. Cat- 

 kins densely flowered, one and 

 one-half to two inches long; 

 stamens twelve to twenty; pistil- 

 late catkins lengthen as the fruit 

 grows, and when the seeds are 

 ripe the catkins are from two and 

 one-half to four inches long. Tree 

 much smaller than the common 

 Cottonwood, it seldom being 

 more than fifty feet high and fif- 

 teen inches in diameter, resem- 

 bling a willow more than a pop- 

 lar. 



Distribution. It is found along 

 streams in Montana, Assiniboia, 



Black Hills of South Dakota and Northwestern Nebraska to Ari- 

 zona. It is the common Poplar of Southern Montana, Eastern 

 Idaho, Wyoming, Utah and Northern Colorado. 

 Propagation -By seeds and cuttings. 



Properties of Wood. Light, soft and weak; light brown, with 

 thin, nearly white, sapwood. Specific gravity, 0.3912; weight of 

 a cubic foot, 24.38 pounds. 



Uses. The Narrowleaf Cottonwood is used as a shade and 

 street tree in towns of Colorado and Utah, for which purpose it 

 does very well if provided with water, and soon forms a conical 

 shapely head. It is hardy in Minnesota, but has been planted here 

 but a few years. 



Populus deltoides. (P. monilifera.) Cottonwood. Car- 

 olina Poplar. Yellow Cottonwood. 



Leaves large, deltoid or broadly ovate, usually abruptly acu- 

 minate, coarsely crenate; petioles laterally compressed. Twigs 



Figure 55. Leaves of Narrow 

 leaf Cottonwood, one-third nat 

 ural size. 



