Proceedings of the American Academy of Arts and Sciences, 
Vou. XXXIL No. 1.— NovemBer, 1896, 
CONTRIBUTIONS FROM THE GRAY HERBARIUM OF 
HARVARD UNIVERSITY. 
see SNR, 
New Serres. — No. X. 
By B. L. Roprnson ano J. M. GREENMAN. 
I. Revision of the Genus. Tridaz. 
Il. Synopsis of the Mexican and Central American Species of the 
Genus Mikania. 
HII. Revision of the Genus Zinnia. 
IV. Revision of the Mexican and Central American Species of the 
Genus Calea. 
3 7. A Provisional Key to the Species of Porophyllum rangin: 
. North of the Isthmus of Panama. 
4 ee Descriptions of New and little known Phanerogams, chietl 
from Oaxaca. 
