KEY FOR THE IDENTIFICATION OF TREES AND SHRUBS 4 3 



15. Leaf egg-shaped; ovate, with 



pointed tip: acute 16 



15 -Leaf lance-shaped: 



lanceolate , with acute or 

 long-pointed tip: ac- 



cuminate 17 



16. Leaf entire, smooth, 

 shining. 



Sour Gum, Tupelo 

 Nyssa sylvatica Marsh. 

 16. Leaf serrulate, smooth, 

 shining. 

 Pear 



Pyrus communis L. 

 16. Leaf serrulate, fairly- 

 smooth above, more or 

 less woolly beneath. 

 Apple 



Pyrus Malus L. 

 16. Leaf somewhat hairy above, 

 thick-woolly beneath. 

 Quince 



Cydonta oblonia Mill. 

 17. Leaf silvery-white with 

 soft hairs on both sur- 

 faces, a thorny tree-shrub. 

 Silver Thorn, Russian 

 Olive 



Elaeagnus aniustt folia L. 

 17 -Leaf shining grey-green, 

 roughened with a few scales 

 beneath, making it a lust- 

 rous, metallic white, a 

 tree-shrub. 

 Oleaster 



Elaeainus umbellata 

 Thunb . 

 17. Leaf entire or serrulate, 

 upper surface smooth. 



Genus Sallx 18 



A large and confus- 

 ing genus with many 

 hybrids . The follow- 

 ing are among the com- 

 moner species on Nan- 

 tucket. 



