Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIII. No. 17. — May, 1898. 



CONTRIBUTIONS FROM THE GRAY HERBARIUM OF 

 HARVARD UNIVERSITY. 



New Series. — No. XIII. 

 By B. L. Robinson. 



I. Revision of the North American and Mexican species of Mimosa. 

 II. Revision of the North American species of Neptiinia. 



