46 KEY FOR THE IDENTIFICATION OF TREES AND SHRUBS 



with large, blunt teeth. 

 White Poplar 

 Popul us al ba L. 

 24. Leaf ovate, heart- 

 shaped, buds pointed, 

 elongated, sticky and 

 aromatic. 

 Balm-of-Gilead 

 Populus candtcans Alt. 

 24. Leaf with slightly heart- 

 shaped base, finely ser- 

 rate. 



Aspen Poplar 



Populus tremulold.es Michx. 

 24. Leaf ovate, pointed, 

 marginal teeth unequal, 

 leaf grey beneath. 

 Large-toothed Poplar 

 Populus £ randtdentata Michx. 

 24. Leaf broadly triangular 

 with a straight base, 

 surface glistening, 2 

 glands at base of blade, 

 fine hairs among marginal 

 teeth. 

 Cottonwood 



Populus deltoldes Marsh. 

 24. Leaf broadly triangular 

 with long-pointed tip, 

 marginal teeth with in- 

 curved, thickened points 

 but no glands or hairs . 

 Carolina Poplar 

 Populus canadensis Moench. 

 25. Leaf shining green, wedge- 

 shaped: obovate, toothed 

 toward the tip. 



Cockspur Thorn 

 Crataegus Crus-iall I L. 

 25. Leaf dull green, broadly 

 ovate, doubly serrate: 

 serrations on each tooth. 

 Hawthorn 



Crataegus submoll Is Sarg. 

 25. Leaf 3-5 lobed. 



English Hawthorn 

 Crataegus monoiyna Jacq. 



