THE TREE WILLOWS OI<^ ALASKA 285 



Skag^way (493, 503), and at Halibut Cove in Cook Inlet (2416). 

 None of the Alaska specimens that we saw were more than 13 to 15 

 feet in height and 3 or 4 inches in diameter. The leaves are obovate 

 to oblanceolate, tapering at the base, obtuse or sometimes acute at the 

 apex, entire or occasionally somewhat crenate-denticulate, the lower 

 surface with some scattered appressed hairs or, on vigorous shoots, a 

 somewhat velvety pubescence, but without the satiny lustre of sitchen- 

 sis. The series is so imperfect that, particularly in the lack of a critical 

 revision of the various forms of this species known in the United 

 States and British America, it is impossible to state conclusively the 

 geographical relationship of these localities to the general range of 

 the species. For the benefit of future observers, however, it may be 

 suggested that the Cook Inlet and Skagway localities pei'haps repre- 

 sent extensions of the interior or Rocky Mountain form through thin 

 spots in the Sitkan coast flora, while the VVrangell locality may repre- 

 sent a northern extension of the form abundant on the coast of Oregon, 

 Washington, and British Columbia. 



