lo Charles E. Bcsscy 



Bebb's Willow (SaUx bebbiana Sarg.) is found in the Black 

 Hills of South Dakota, and the Rocky Mountains from Montana 

 to Colorado, from which it has extended eastward (9) so as to 

 enter the northwest corner of the state (Dawes and Sioux coun- 

 ties). 



Diamond Willow (Sali.v inissouriensis Bebb) is common along 

 the Missouri River in Western Missouri from which region it 

 has extended its range northward along the river, and westward 

 in the Republican, Platte and Niobrara river valleys to the west- 

 ern border (10). 



The Poplars (Populus spp.). The bi- and tricarpellary seed- 

 pods develop two or three rows of seeds having the same general 

 structure as those of the Willows. On the escape of the seeds 

 they are buoyed up by the attached mass of fluffy hairs, and car- 

 ried away by the winds, sometimes for several miles. 



Quaking Aspen (Popuhis trcniuJoidcs Michx.) is a Rocky 

 Mountain tree which has extended eastward into Nebraska but 

 a few miles in the western counties (11) from Banner to Sioux, 

 Dawes and Sheridan counties. 



Balsam Poplar (Populus balsamifcra L.) occurs in the Rocky 

 Mountains of Wyoming from which it has extended eastward 

 into Nebraska in Sioux County (12). 



Narrow-leaf Cottonwood (Populus angustifolia James) is also 

 a member of the forests of the Rocky Mountains, from which it 

 has come eastward into Nebraska (13) in Sioux and Scott's 

 Bluff counties. 



Rydberg's Cottonwood (Populus acuminata Ryd.) occurs here 

 and there in the Rocky Mountains of Colorado and Wyoming, 

 from which it has invaded western Nel^raska (14) at one point 

 (Scott's Bluff County). 



Common Cottonwood (Populus deltoidcs Marsh.) is very 

 abundant in the Missouri forests, from which it has passed up 

 the rivers across the state (15) to -the western border and beyond. 



FLESHY FRUITS 



Red Cedar (Juniperns spp.). The small few-scaled cones in- 

 crease their parenchymatous tissue and become fleshy, and berry- 



20 



