100 FLORA OF THE UPPER SUSQUEHANNA. 



5. rostrata Richards. Beaked Willow. Not very common; 

 most plentiful in the eastern part of our range. 



S. discolor Muhl. Glaucous Willow. Pussy Willow. Very- 

 common in wet soils. Aments appearing before the leaves in 

 spring ; very noticeable. 



S. discolor prinoides (Pursh) Anders. Common on the rocky 

 banks of Cayuta creek, near East Waverly, Millspaugh. 

 (S. discolor, var. prinoides Anders.) 



S. humilis Marsh. Prairie Willow. Tolerably common. A 

 low shrub found on dry hills. 



S. tristis Ait. Dwarf Gray Willow. Sage Willow. Not un- 

 common in uplands. Rare. Lucy. A shrub much .smaller than 

 the preceding, seldom growing more than two feet high. 



S. sericea Marsh. Silky Willow. Not uncommon by creeks 

 and swamps throughout. 



S. purpurea L. Purple Willow. Edge of swamp, City of El- 

 mira, Lucy. 



S. cordata Muhl. Heart-leaved Willow. Common in wet 

 places. 



Many of the willows hybridize frequently. Hybrids of 



S. alba xfragilis, S. cordata x sericea, and forms that may be 

 referred to S. lucida and S. cordata are reported from the 

 vicinity of Waverly, by Dr. Millspaugh. 



POPULUS L. 



P. alba L. White Poplar. Abele. Not uncommon through- 

 out in cultivation, and spreading by means of suckers from the 

 roots. 



P. tremuloides ]Michx. American Aspen. Abundant in nearly 

 all soils. A familiar small tree of very rapid growth ; one of the 

 first to spring up after a wood has been cut down or the soil 

 burned over. Leaves on long petioles, very tremulous in the 

 wind. 



P. grandidentata Michx. Large-toothed Aspen. Common. 

 Found with the preceding, which it much resembles, but never 

 in such numbers. Apparently a somewhat larger tree. 



