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. hif>l>ocastanuin, p. 197. 



194 



