The ElsBJ 



A - usually rough on one or both bui j branches without corky 



ridges 



1. Leaves rough above, smooth beneath; petioles Bmooth; bud scab 



smooth; fruit notched at the apex, hairy-f ringed; inner bark I 



mucilaginous nn kite I'.lm. p. 97. 



2. Leav< - rough on both sides; petioles hairy; bud sea rown- 



hairy; fruit not notched at the apex, not hairy-margined; inner 



bark mucilaginous Snpperj I'.lm. p. 99. 



B. Leaves smooth on both sides; branches often with prominent cork) 



ridges; fruits hairy on the sides, wing narrow i ork Kim. p. 101. 



Plums and ( hemes 



A. Flowers in elongated cluster- terminating leafy branchlets; trees not 



thorny 

 1. Leaves thinnish, margins with slender, spreading, pointed teeth 



Choke Cherry, p. 12:. 



J. Leave- thickish. margins with incurved, more or less callous teeth 



Wild Black Cherry, p. 121. 



B, Flowers in tufted, axillary clusters; trees more or less thorny, often 

 shrubby and growing in thicket- Wild Plum, p. 1! ( ». 



The Maples 



A. Leaves simple, palmately veined and lobed; twigs not whitish or bluish 



1. Flowers appearing in very early spring before the leaves; \e&^ 

 sharply cut or lobed, silvery beneath; branches and whole tret 

 often distinctly pinkish or reddish Silver Maple, p. 137. 



2. Flowers appearing after the leaves; leaves not silvery beneath; 

 twigs and branches not reddish, usually gray 



a Petioles exuding a milky juice when cut; bark fissured, but 

 not particularly scaly Norway Maple, p. 141. 



a 2 Petioles not exuding a milky juice when cut; bark deeply 

 furrowed, often in plates Sugar Maple, p. 139. 



B. Leaves pinnately compound; twigs whitish or bluish; trees often 

 irregular or ill-shapen Box-elder, p. 14 



Buckeye and Horsechestnut 



A. Flowers yellowish; bods not resinous; leaflets usually 5; a small, more 

 or less bushy tree Buckeye, p. 145. 



B. Flowers white; winter buds resinous; leaflets usually 7; a large, er» 

 beautiful tree Horsechestnut, p. 147. 



The Ashes 



A. Twigs, petioles and lower surfaces of leaflets smooth 



1. Wing of the fruit terminal; leaflets entire or obscurely and finely 

 serrate or toothed White Ash, p. 151. 



2. Wing of the fruit extended along the side of the see<l, oft 

 half-way to the base; leaflets finely serrate Green Ash, p. I 



B. Twigs, petioles and lower surfaces of leaflets more or less hairy; wing 

 of fruit as in Green Ash Red \>h. n. L53. 



The Catalpai 



A. Flowers 1 ' 2 inches wide; prominently yellow spotted; septum of p 

 narrow in cross -ection Common Catalpa. p. 159 



\'>. Flower.- J 1 - inches wide, not prominently yellow spotted; septum of 

 pod broad in cross -eetion Bard] Catalpa, p. 157. 



■15— 



