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Salix discolor, Muhl. Glaucous Willow. 



In cold swamps in the Minnesota valley and in the 

 Black Hills. 



Salix cordata, Muhl. Heart-leaved Willow. 

 Along streams throughout the state. 



Salix balsamifera, (Hook.) Barrett. Balsam Willow. 

 In the cold spring swamps in the Minnesota region. 



Salix aclenophylla, (Hook.) Furry Willow. 



A single specimen was collected on the shores of one 

 of the numerous lakes found in the coteaus in the north- 

 eastern part of the state, which is doubtfully referred to 

 this species. 



Salix myrtilloides, L. Bog Willow. 



In the boggy swamps at the head of the coulies in the 

 Minnesota region. 



BETULACE.E. The Birch Family. 



Ostrya virgiuica, (Mill.) Iron-wood. 



On wooded bluffs in the Minnesota region, and among 

 the foot-hills in the Black Hills. 



Corylus Americana, Walt. Hazelnut. 



In thickets and open woods in the Minnesota and 

 Sioux regions, and in the Black Hills. 



Corylus rostrata, Ait. Beaked Hazelnut. 



In the Black Hills, not as common as the last. 



Betula papyrifera, Marsh. Canoe Birch. 

 Common in the Black Hills. 



Betula occideiitalis, Hook. Western Red Birch. 

 In the Black Hills; common. 



Betula glaudulosa, Michx. Scrub Birch. 



A low shrub, abundant in many places in the Black 

 .Hills. 



