TREES 45 



ee Bark of trunk or of twigs with high corky 

 ridges 



/Corky ridges on main trunk; leaf base oblique Hackberry 



//Corky ridges on twigs 



g Leaves lobed Sweet Gum 



gg Leaves not lobed , Cork Elm 



eee Bark like alligator skin, twigs aromatic Black Cherry 



eeee Bark green on limbs, and in young trees also 

 on main trunk 



/ Leaves broad, as wide or nearly as wide as 

 long 



g Undersurface of leaves silvery white with 

 hairs 



h Leaf stem flattened from side to side White Poplar 



hh Leaf stem square or channeled, not flat Downy Poplar 



gg Undersurface of leaves not silvery 



h Leaf stem flattened from side to side 



i Branches ascending close to trunk Lombardy Poplar 

 ii Branches spreading 



j Leaves cut off square at base, 

 taper-pointed 



Carolina Poplar or Cotton wood 



jj Leaves broadly ovate 

 k Marginal teeth coarse 



Large-toothed Aspen Poplar 

 kk Marginal teeth fine 



Small-toothed Aspen Poplar 

 hh Leaf stem not flattened, channeled 



i Leaf hairy below Balm of Gilead 



ii Leaf smooth but silvery below 



Balsam Poplar 



ff Leaves narrow, not nearly as wide as long 

 (willows, Syrticola) 



g Leaves smooth or nearly so on both sides 

 when mature 

 h Leaves ten times as long as wide 



(shrub) Long-leaved Willow (S. longifolia) 



hh Leaves broader, lanceolate to ovate 

 i Branches drooping 



Weeping Willow (S. babylonica) 



