184 



Bulletin 145 



The character which will make its recognition sure, however, is 1 



the fruit. This is a triangular capsule one to two inches long, , 



consisting of three papery-walled pods grown together. Usually I 

 the seeds in two of these pods are abortive, while that in the third 



Bladder-nut. 

 Flowering branch and fruit, X %. 



is the size of a small pea. This may loosen as it ripens con- 

 verting the pod into a curious natural rattlebox. The adaptation 

 of this peculiarity of structure to the dissemination of the seed, 

 whether through the agency of air or water, is evident. 



