WINTER KEY TO THE SPECIES OF CATALPA 



a. Fruiting capsules about J4 inch thick; seeds with pointed, 

 fringed wings at each end; branches rather crooked and 

 straggling; bark thin, separating into thin scales on the 



trunk C. bignonioides, p. 227. 



aa. Fruiting capsules about l / 2 inch thick, seeds with rounded, 

 wide-fringed wings at each end; branches not crooked and 

 straggling; bark thick, separating into thick scales on the 

 trunk C. speciosa, p. 225. 



223 



