LANCE-LEAF COTTONWOOD. 



Populus acumitiatd Kydb. 



Fig. 112. Fruiting branchlet and mature leaves and fruit; branchlets in winter, the upper one 

 bearing four flower-buds, the lower one two leaf-buds and one terminal flower-bud. 



113. Trunk near Greeley, Colo. 



For this trunk picture and specimens the author is indebted to Prof. B. O. Longyear. 



