SALICACE^E 155 



Distribution. Borders of streams and swamps; shores of Great Slave Lake southward 

 through the region at the eastern base of the Rocky Mountains to Saskatchewan, northern 



Fig. 149 



Idaho, and northwestern Wyoming, and to western Nevada (Lake County; M . S. Bebb), and 

 on the high Sierra Nevada in Calaveras and Mariposa Counties, California (W. L.Jepsori). 



16. Salix missouriensis Bebb. 



Leaves lanceolate or oblanceolate, acuminate and long-pointed at apex, gradually nar- 

 rowed from above the middle to the cuneate or rounded base, finely glandular-serrate, 

 coated with pale hairs on the lower surface and pilose on the upper surface when they un- 



fold, soon becoming nearly glabrous, at maturity thin and firm, dark green above, pale and 

 often silvery white below, 4'-6' long, l'-l|' wide, with slender veins often united near the 

 margins and connected by coarse reticulate veinlets; petioles stout, pubescent or tomen- 

 tose, ^'-f'*long; stipules foliaceous, semicordate, pointed or rarely reniform and obtuse, 

 serrate with incurved teeth, dark green and glabrous on the upper side, coated on the lower 

 with hoary tomentum, reticulate-venulqse, often %' long, deciduous or persistent during 



