SUMMER KEY TO THE SPECIES OFAESCULUS 



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 



