SUMMER KEY TO THE SPECIES OF CATALPA 



a. Leaves 5-8 inches long, thick; flowers i l /2 inches across, 

 prominently yellow-spotted; seeds with pointed, fringed 

 wings at each end; branches rather crooked and straggling; 



bark thin, separating into thin scales on the trunk 



bignonioides, p. 227. 



aa. Leaves 8-12 inches long, thin; flowers 2 l / 2 inches across, 

 not prominently spotted; 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. 



222 



