194 



TREES OF MINNESOTA. 



leaves, cylindrical twigs and general habit of the Balsam 

 Poplar. The forms of this are known to horticulturists here 

 as P. Nolesti 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. 

 Catkins densely flowered, 11 to 

 2 inches long; stamens 12 to 20; 

 pistillate catkins lengthen as the 

 fruit grows and when the seeds 

 are ripe the catkins are from 

 two-and-a-half to four inches 

 long. Tree much smaller than 

 the common Cottonwood, it sel- 

 dom being more than fifty feet 

 high and fifteen inches in diam- 

 eter, resembling a willow more 

 than a poplar. 



Distribution. It is found 

 along streams in Montana, As- 

 siniboia, Black Hills of South Dakota and northwestern 

 Nebraska to Arizona. 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 

 acuminate, coarsely crenate; petioles laterally compressed. 



Fig. 4,1. Leaves of Narrow- 

 leaf Cottonwood. 1/3 natural 

 size. 



