The Shrubs of Wyoming. 



Bog Willow (Salix glaucops Anders.) 



A low but diffuse shrub with short, stout branches and ob- 

 long leaves, somewhat bluish beneath and about an inch and a 

 half long. It occurs in low swales in the higher mountains. 



Hairy Willow (Salix stricta (Anders.) Rydb.) 



A low scraggy shrub, only one or two feet high, growing in 

 bogs and on moist slopes in the mountains. The leaves are 

 from Y\ to i l / 2 inches long and are covered with woolly hairs, 

 but less densely so on their upper surfaces. In this and the 

 two preceding willows the capsules which contain the seed are 

 quite hairy. 



Wolf's Willow (Salix Wolf it Bebb). 



Much resembling the bog willow and hairy willow, but the 

 capsules are smooth (without hairs) and its leaves are nearly 

 devoid of woolly hairs. This is also a low mountain willow. 



Geyer's Willow (Salix Geyeriana Anders.) 



This willow is of frequent occurrence along streams in the 

 foothills of the mountains. It grows 6 to 15 feet high, and is 

 characterized by its bluish twigs. The leaves are rather nar- 

 row, either smooth or somewhat minutely hairy and from an 

 inch to two inches long. 



This is a handsome shrub which well deserves to be planted 

 as an ornamental. 



Pelt-leaved Willow (Salix pellita Anders.) 



This has the bluish twigs of Geyer's willow, but the leaves 

 are much larger (2-4 inches long) and have white shining un- 

 der surfaces. 



BIRCH FAMILY. 

 (Betulaceae). 



This family is represented in Wyoming by three birches and 

 one alder. "As in the willow family the flowers are borne in 

 separate clusters, but in this on the same plant, while in the 



