Proceedings of the American Academy of Arts and Sciences. 
Vor. XXXII No. 1.— NovemeBer, 1896. 
Penal Das. 4, 1896. 
CONTRIBUTIONS FROM THE GRAY HERBARIUM OF 
HARVARD UNIVERSITY. 
el 
New Series. — No. X. 
By B. L. Roprnson anp J. M. GREENMAN. 
gl 
os 
Revision of the Genus Tridaz. 
II. Synopsis of the Mexican and Central American Species of the 
Genus Mikania. 
= III. Revision of the Genus Zinnia. 
_ IV. Revision of the Mexican and Central American Species of the 
Genus Calea. 
ve A Provisional Key to the Species of Porophyllum ree 
North of the Isthmus of Panama. 
— 
4 i - Descriptions of New and little known Phanerogams, chiefly : 
from Oaxaca. 
