TREES 47 



h Cultivated trees 



i Leaves finely serrate White Willow (S. alba) 



ii Leaves entire Osier Willow (S. mminalis) 



hh Native shrubs 



j Low, 1-6 ft. high 



k Leaves 2 inches or 

 less; 1-2 ft. 



Dwarf Gray Willow (S. tristis) 



kk Leaves 2 inches or 



more long; 2-6 ft. 



/ Leaves and young 



twigs white, hairy 



beneath Hoary Willow (S. Candida) 



II Leaves gray, 

 hairy beneath 



Prairie Willow (S. humilis) 

 jj Tall shrubs, 5-12 ft. 

 high 

 k Leaves hairy both 



sides S. syrticola 



kk Leaves hairy only 

 below 



/ Leaves narrowly 

 lanceolate, silky, 



shiny, below Silky Willow (S. scricea) 



II Leaves broadly 

 lanceolate, white, 

 hairy below 



Dwarf Gray Willow (S. rostrata] 

 eeeee Bark with none of foregoing characters 

 /Leaves lobed (except shingle oak) 



g Bearing apples Hawthorn (Crataegus) 



gg Bearing acorns Oaks (Quercus) 



h Leaves with rounded lobes, 

 not bristle-tipped 

 i Leaf broadest across mid- 

 dle; acorn long, | in cup 



White Oak (Quercus alba) 

 ii Leaf broadest at outer end 

 j Acorn short-stalked, |- in 



fringed cup Bur Oak (Q. macrocarpa) 



jj Acorn, long-stalked, \ in 



cup Swamp White Oak (Q. Ucolor) 



hh Leaves with acute lobes, 

 bristle-pointed when young 



