WINTER KEY TO THE SPECIES OF AESCULUS 



a. Terminal bud about Ji inch long; bud-scales covered with 

 a glaucous bloom, not conspicuously resinous; bark broken 



into thick plates; prickly bur about I inch in diameter 



A. glabra, p. 199. 



aa. Terminal bud i-i^ inches long; bud-scales conspicuously 

 sticky-resinous, glistening; bark broken into thin plates; 



prickly bur about 2 inches in diameter. : 



A. hippocastanum, p. 197. 



195 



