MICHIGAN ACADEMY OF SCIENCE. 157 



Salicaceae. Willow Fanrily. 



Salix nigra, Marsh. Black Willow. — Frequent as a shrub or small tree in 

 damp ground and on banks of ponds, lakes, and streams. 



Salix amygdaloides Anders. Peach-leaved Willow. — Our principal native 

 tree willow. Abundant in damp ground, on borders of streams and in open 

 places of damp woods. 



Salix pentandra L. Bay-leaved Willow. — Frequently planted, but not 

 escaping so far as observed. 



Salix lucida Muhl. Shining Willow. — Very common in wet and marshy 

 ground. 



Salix serissima (Bailey) Fernald. Autumn Willow. — Occasional in damp 

 marshy ground. Pistillate catkins persist till autumn. 



Salix fragilis L. Crack Willow. — Occasional as a small tree throughout 

 the county. 



Salix alba L. White Willow. — Well established as an escape and fre- 

 quent in damp places and on banks of streams. 



Salix alba vitellina (L.) Koch. Yellow Willow. — Noticed often in cultiva- 

 tion. 



Salix alba caerulea (Sm.) Koch. Blue Willow. — Noticed as occasional in 

 cultivation. 



Salix babylonica L. Weeping Willow. — Planted frequently, especially in 

 cemeteries, but not escaping so far as noticed. 



Salix longifolia Muhl. Sand Bar Willow. — Frequent on and near the 

 shore of Lake Huron and along the banks of streams. 



Selix cardota Muhl. Heart-leaved Willow. — Frequent in damp places and 

 along streams. 



Salix glaucophylla Bebb. Broad-leaved Willow. — Abundant on Lake 

 Huron shore and sand dunes at Port Franks. A good sand binder. Not 

 noticed elsewhere. 



Salix pedicillaris Pursh. Bog Willow. — Frequent in boggy places and wet 

 meadows. 



Salix discolor Muhl. Glaucous Willow. — Common on borders of marshes, 

 damp woods, and along banks of streams. 



Salix petiolaris Sm. Slender Willow. — Common in marshy ground. 



Salix humilis Marsh. Prairie Willow. — Frequent in dry and sandy 

 ground. 



Salix sericea Marsh. Silky Willow. — Frequent in wet places. 



Salix rostrata Richards. Bebb's Willow. — Frequent on drj^ or moist 

 ground, on l:)orders of marshes, damp woods and along banks of streams. 



Salix Candida Flugge. Sage Willow. Hoary Willow. — Common in very 

 wet and boggy places. 



Salix purpurea L. Purple Willow. — Planted by cottage 0A\aiers and 

 thriving on Lake Huron shore near Sarnia. It seems to be a good sand- 

 binder. 



Populus alba L. White Poplar. Silver-leaved Poplar. — Planted and 

 spreading liy root in sandy ground. Have noticed pistillate flowers only. 



Populus tremuloides Michx. American Aspen. — Very common. It often 

 takes almost entire i^ossession of marshes and burned-over districts. 



Populus grandidentata Michx. Large-toothed Aspen. — Common in rich 

 open woods, on borders of marshes and streams. Often on verj^ dry and 

 sandy ground. 



