SUMMER KEY TO THE SPECIES OF SALIX* 
a. Leaf-petioles without glands. 
b. Leaves 14-34 inch broad; petioles broad and flat......... 
ip See mM LaLa atiyuadaaoamnoy ends. RAC S. nigra, p. 37. 
bb. Leaves 34-1% inches broad; petioles slender and terete.. 
SOW PIDGRS ESATA NG Shae ERE S. amygdaloides, p. 39. 
aa. Leaf-petioles glandular above. 
b. Leaves %4-% inch broad, sharp-serrate; tree with weeping 
Thabite-s-urscctaiadesaiacgiicded 8 ohobacnd Aerhenarecs ...S. babylonica, p. 43. 
bb. Leaves 14-134 inches broad, blunt-serrate; tree with up- 
Hehe Nabitvey vxccsss weaken ies eeelees S. fragilis, p. 41. 
WINTER KEY TO THE SPECIES OF SALIX 
The classification of the Willows is a task for the specialist, 
even when leaves and both staminate and pistillate flowers are 
obtainable. It is impractible for the novice to attempt the deter- 
mination of species of Salix with winter characters alone. Cou- 
sequently the usual winter key is omitted. 
*Tt is not intended that this key. shall serve as a means of 
identification of any species of Salix found in Michigan, but it 
has added simply to give a ready comparison of the four species 
which are described. 
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