KEY FOR THE IDENTIFICATION OF TREES AND SHRUBS 47 



26. Leaf smooth, dark green, 

 3-lobed, the two lateral 

 lobes square cut, the 

 middle one indented. 

 Tulip Tree 



Llrlodendron TulipiferaL. 

 26. Leaf with 3-5 pointed 



lobes, base of petiole en- 

 larged and tubular, sur- 

 rounding the twig and 

 covering the lateral bud. 



Genus Platanus .... 27 

 26. Leaf with 2 thumb-like 

 lateral lobes; others on 

 the same tree without 

 lobes or with one lobe . . 28 

 27. Leaf as broad as, or 

 broader than long, one 

 ball only on each blos- 

 som stalk. 

 Western Plane Tree, Sycamore 

 Platanus occidental I s L. 

 27. Leaf as long as or 



longer than broad, cen- 

 tral lobe usually elon- 

 gated, more than one 

 ball usually on each 

 blossom stalk. 

 London Plane Tree 

 Platanus acert folia (Ait.) 

 Willd. 

 28. Leaf margin entire. 



Genus Sassafras 38 



28. Leaf margin toothed. 



Genus fforus 38 



29. Leaf thin, smooth, green 



on both sides, not lobed . 30 

 29. Leaf thick, lobed. 



Genus Quercus .... 32 

 30. Leaves set in more than 

 2 rows on the stem. 

 American Chestnut 

 Castanea dentata (Marsh.) 

 Borkh. 



