284 COVILLE 



mens of it, all from the Cook Inlet country, are now in the National 

 Herbarium: one from the vicinity of Homer, collected in 1S97 by 

 Walter H. Evans (No. 470) ; another at Kussilof, in 189S, also by 

 Mr. Evans (No. 693) ; and the third by Captain E. F. Glenn in 1899, 

 probably from near the mouth of the Sushitna River. At the Homer 

 locality, on the brushy portion of the sand spit east of the point, it 

 grew as a shrub or small tree 4 to 15 feet in height; at Kussilof it 

 grew 10 to 15 feet high, and 6 to 8 inches in diameter, often forming 

 thickets. This willow is doubtless abundant throughout Cook Inlet, 

 and is a member of that group of plants of the same region which be- 

 long geographically not to the Sitkan floral district, of the moisture- 

 laden coast of southern Alaska, nor to the Aleutian flora, but to the 

 flora of the interior of British America. Only further exploration can 

 show decisively whether Cook Inlet forms an isolated western pocket 

 of this interior flora, where certain species, in migrations caused by 

 changing climatic conditions of earlier centuries, have found congenial 

 surroundings similar to those of their intracoastal home, or whether 

 the interior flora, which abuts against the Sitkan coast flora, extends 

 in a continuous strip across the headwaters of the Yukon to the water- 

 shed of Cook Inlet, having pushed its way westward around the 

 northern end of the Sitkan flora and between it and the southern limit 

 of the subarctic flora. The data already at hand indicate that the dis- 

 tribution of some at least of these interior species is almost continuous 

 to Cook Inlet, while that of others, like Salix bebbiana^ may be inter- 

 rupted over a wide area. 



SALIX NUTTALLII Sargent. Nuttall Willow. 



Salix flavescens Nutt. Syl. i : 65. 1842, Not Host. 1828. 

 Salix nitttallii Sargent, Gard. & For. 8 : 463. 1895.1 



Type locality " in the range of the Rocky Mountains." 

 This willow belongs to a variable species finding its eastern limit in 

 the Rocky Mountains, its western limit at the shore of the Pacific. 

 It occurs as far south as Utah and Arizona, and in California extends 

 southward along the coast to the bay of Monterey and along the Sierra 

 Nevada to the San Bernardino range. Northward from California it is 

 abundant along the coast and in the mountains to British Columbia. 

 In Alaska it has been very sparingly collected, and along the coastal 

 portion of the Territory it is apparently of rare occurrence. It was 

 observed on the Harriman Expedition only at Wrangell (442), near 



' For further synonymy, see Sargent's ' Silva of North America ' and ' Sud- 

 worth's Nomenclature of the Arborescent Flora of the United States.' 



