SUMMER KEY TO THE SPECIES OF AESCULUS 



a. Leaflets usually 5; foliage ill-smelling when bruised; bark 

 broken into thick plates; prickly bur about I inch in diam- 



eter A. glabra, p. 199. 



aa. Leaflets usually 7; foliage not ill-smelling when bruised; 

 bark broken into thin plates; prickly bur about 2 inches in 

 diameter A. hippocastanum, p. 197. 



194 



