The Trees of Wyoming.. 



XIX. DESERT JUNIPER. Typical specimens of this species. 



Willow Family. 



(Salicacece) 



Although Cottonwoods and Willows seem quite dif- 

 ferent, yet, botanically, they have many features in com- 

 mon. Both drop their leaves at the end of the growing- 

 season, that is they are deciduous. Both have the male 

 and the female flowers on different trees (dioecious). The 

 flowers in both are produced in early spring, before or 

 with the. leaves. Male and female flowers are both in 

 slender clusters or tassels known as aments or catkins 

 (the ' ' pussies " of the children). These are usually droop- 



