NARROW-LEAF COTTONWOOD. 



Populus angustifolia James. 



Fiff. 114. Fruiting branchlet, leaves and fruit; branchlets in winter, the lower one bearing 

 mainly flower-buds. 



lis. Trunk of tree near Fort Collins, Colo. 



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



