ANALYTICAL KEY 



TO THE FAMILIES OF TREES IN WINTER 



1. LEAF-SCARS OPPOSITE. 



A. Buds large, gummy ; scales overlapping ; leaf-scars 

 prominent. Horsechestnut. (^sculus, p. 15.) 



B. Buds small, not gummy. 



Twigs slender. 



Twigs glaucous ; bud-scales delicate. Maple. 



(Acer, p. 21.) 

 Recent shoots pubescent ; flower-buds round, 



conspicuous, their tips curved. Cornel. 



(Cornus, p. 121.) 

 Twigs stout. 



Twigs gray, flattened at the nodes ; bud-scales 



leathery. Ash. (Fraxinus, p. 35.) 

 Twigs glaucous ; leaf-scars often in whorls of 



three. Catalpa. (Catalpa, p. 158.) 



2. LEAF-SCARS ALTERNATE. 



A. Trees with thorns or prickles. 



a. Buds superposed, hidden within the stem. 

 Thorns long and branched ; terminal bud absent 



Honey Locust. (Gleditsia, p. 132.) 

 Prickles inconspicuous, in the position of stipules. 

 Common Locust. (Robinia, p. 129.) 



b. Buds not superposed or hidden within the stem ; 



stems coarse, covered with prickles ; pith con- 

 spicuous. Hercules' Club. (Ara/ia, p. 162.) 

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