W yarning Experiment Station. 



their borders or in groves quite covering the adjacent low 

 bottom lands. It may always be known by the small, nar- 

 row leaves and the dark, thickened, furrowed bark which 

 becomes enormously thickened in the old trees. 

 (2) LANCELEAF COTTONWOOD. 



(Popttlus acujjiinata Rydb.) 



Description. Leaves broad- 

 ly lance-shaped or ovate, apex 

 acuminate, finely scalloped on the 

 margins, larger than in the fore- 

 going species, 2 to 3 inches long 

 (on young shoots often more): 

 buds medium sized, light brown 

 (see Plate XX, Fig. 4): twigs 

 slender, light colored: bark in 

 young trees very smooth and almost white, becoming darker and rougher as 

 the trees get older but never so much so as in the preceding species. 



Though found native in the state it is far from com- 

 mon and, so far as the writer's observation goes, occurs 

 very sparingly on only a few tributaries of the Platte in 

 the eastern part of the state. That it occurs elsewhere 

 within our borders is, however, quite probable. It attains 

 nearly as great a size as the preceding but is a smoother, 

 handsomer tree at all times. It makes a more rapid 

 growth, is a trifle less hardy but is used largely for plant- 

 ing mostly from nursery stock. 



(3) COTTONWOOD. 



(Pjpitlus deltoides Marsh.) 



Description. Leaves broad, 

 deltoid-ovate, the apex abrupt- 

 ly pointed, the base nearly 

 truncate, rather coarsely scal- 

 loped or toothed on the mar- 

 gin: buds larger than in the 

 preceding (see Plate XX, Fig 

 3): the youngest branchlets 

 angled: bark grayish, becom- 

 ing rough and irregularly fur- 

 rowed as the tree gets older. 



This is the (com- 

 mon) Cottonwood of 



