SUMMER KEY TO THE SPECIES OF AESCULUS 
a. Leaflets usually 5; foliage ill-smelling when bruised; bark 
broken into thick plates; prickly bur about 1 inch in diam- 
GLE Ti, 5, elticedes ad aura ba aoa Sean tases aK 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 
TAM ELST 55.6.5 arnd ecnisusidvensecn ane oes A. hippocastanum, p. 197. 
—~ 194 — 
