STATE GEOLOGIST. 



295 



Heart-leaved 

 Willow. 



Narrow-leaved 

 Willow. 



Long-beaked 

 Willow. 



Brittle Willow. 



Black Willow. 



Shining Willow. 



Long-leaved 

 Willow. 



Stalk-fruited 

 Willow. 



Weeping Willow. 



Salix cordata, Mubt. 



Grand Traverso Co. 



Salix angustata, Pursli. 



Ann Arbor. 



Salix rostrata, Kichardson. 



Ann Arbor; St. Joseph's I. ; S. E. (Univ. Herb). A common 



Salix fragiiis, L. 



Ann Arbor. 



Salix nigra, Marshall. 



Ann Arbor. 



Salix lucida, Muhl. 



Drummond's I. ; S. E. (Univ. Herb). 



Salix longifolia, Muhl. 



S. Mich. (Univ. Herb.) 



Salix pedicellaris, Pursh. 



Drummond's I. ; S. E. (Univ. Herb). 



Salix Babylonica, L. 



Cultivated in many places for ornament. 



Barely spontaneous. 



American Aspen. 



Large-toothed 

 Aspen. 



Downy-leaved 

 Poplar. 



Cotton wood, 

 Necklace Pop- 

 lar. 



Balsam Poplar, 

 Tacamahac. 



Balm of Gilead. 



Lombardy Pop- 

 lar. 



Populus tremuloides, Michx. 



Ann Arbor; Sand Pt., Saginaw B. ; Drummond's I.; Sugar I., this and 

 the next were growing abundant, large and promiscuously to- 

 gether; Antrim Co. This is one of the most common trees about 

 the lake shores, seldom attaining, however, a large size. It of ten 

 springs up abundantly with Betula papyracea in exposed situations 

 where the forest growth has been prostrated by fire or tempest. 



Populus grandidentata, Michx. 



Ann Arbor; Sand Pt., Saginaw Bay; Sugar I.; Antrim Co. This is a 

 rarer but more valuable tree than the last. They are often found 

 in company, but this was never known to accept an exposed or 

 unfavorable situation for the sake of such company; while the 

 former often intrudes upon soil and situations chosen by the latter. 

 This often forms a large tree with a naked, smooth and dingy-yel- 

 low trunk expanding its brawny and conspicuous limbs at a height 

 of 60 feet. 



Populus heternphylla, L. 



S. Mich. (Univ. Herb.)' 



Populus monilifera, Ait. 



Ann Arbor. 



Populus balsamifera, L. 



Thunder Bay, L. Huron; L. Mich., common- This is a common tree in 

 low lands about the borders of rivers and swamps. It is very 

 common on Drummond's I. , but it is of little economical value, its 

 height seldom reaching 30 feet, while its usual size is about fifteen. 



var. candicans. (P. candicans — W.J 



This is common in cultivation, but rare in a wild state. But a single 

 specimen was seen which was a large tree standing near the lake 

 shore a few miles north of Elk Rapids, Antrim Co. 



Populus dilatata, Ait. 



Ann Arbor, in cultivation, and at many other localities, sparingly nat- 

 uralized. Probably the largest specimens of this tree in the State 

 are on the site of the " Old British Fort" near the mouth of St. 

 Mary's R. , on Drummond's I. 



(P. Canadensis — W.J 



