Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXII. No. 16. — June, 1897. 



CONTRIBUTIONS FROM THE GRAY HERBARIUM OF 



HARVARD UNIVERSITY. 



New Series. — No. XL 

 By J. M. Greenman. 



I. Revision of the Mexican and Central American Species of 

 Houstonia. 



II. Key to the Mexican Species of Liabum. 



III. Descriptions of New or little known Plants from Mexico. 



^ 



