SIMPLE SPIRAL LOBED LEAVES 



86 Leaves palmately veined ; palmately or irregularly lobed 87 



86 Leaves pinnately veined; pinnately or irregularly lobed 90 



87 Lobes entire; leaf 3-lobed at tip and 3-veined at base of blade 



SPICE-BUSH (BENZOIN) 



87 Lobes toothed 88 



88 Lobes 5-7, finely toothed ; bark of branches sometimes showing 



corky ridges SWEET GUM (LIQUIDAMBER) ^ 



88 Lobes 3-5, coarsely toothed ; bark not corky 89 



89 Under surface of leaves bearing a w^hite mat of hairs 



WHITE POPLAR (POPULUS) 



89 Leaves with a few or no hairs on under surface 



SHRUBBY ALTHEA (HIBISCUS) 



90 Leaves mitten-shaped, with one or two "thumbs," varying from 



oval to lobed on the same tree (SASSAFRAS) i 



90 Leaves not mitten-shaped or varying as much as above 91 



91 Winter-buds stalked, showing 2 or 3 scales; leaf-scars half- 

 round or triangular, with 3 bundle-scars ALDER (ALNUS) ^^ 



91 Winter-buds not stalked, but spurs sometimes present 92 



92 Leaves 2-ranked ^^ 



92 Leaves in more than 2 ranks 95 



93 Winter-buds blunt and plump, showing more than 3 scales 



HAZEL (CORYLUS) 



93 Winter-buds usually sharp-pointed, somewhat plump, showing 



2 or 3 scales 94 



94 Leaves double-toothed; bark of trunk white or orange, spurs 



sometimes present BIRCH (BETULA) ^ 



94 Leaves usually coarsely single-toothed; bark not white or 



orange LINDEN, BASSWOOD (TILIA) : 



95 Bud-scales 10 or more ; bundle-scars numerous, irregularly scat- 



tered 96 



95 Bud-scales not more than 10 ; bundle-scars 3 or in 3 groups 97 



17 



