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. GrREENMAN. 
I. Revision of the Mexican and Central American Species of 
Houstonia. 
II. Key to the Mexican Species of Liabum. 
Til. Descriptions of New or little known Plants from Mexico. 
