Fg 
* 
i 
ae 
spreading over to the Rocky mountains in Montana, and 
approximating in character several very diverse northern : 
date, it is at the south that the variation toward S. glauca 0c- 
‘and the Cascades. 
110 BOTANICAL GAZETTE. [ May, | 
species. " 
P i- a 
\ 
the summit of the Selkirks (51°) and northwestward *’ !—that | 
is, along the trend of the mountains. 
intermediate in character between the Glaucz and the 
curs and at the north the transition toward S. cordata ? 
a 
in 
ble manner glauca-like and cordata-like characteristics, we 
etween Oregon and Alaska I do not know of a willow 80 
nearly allied to S. glauca as this plant of the Blue mountains 
Ss. commutata, N. sp. A diffuse alpine shrub of variable 
Stature, commonly 3 to 4 feet in h 
