Proceedings of the American Academy of Arts and Sciences. 



VuL. XXXIl. No. I. — NovEiMBLii, 1896. • 



CONTRIBUTIONS FROM TIIF: GRAY HERBARIUM OF 

 HARVARD UNIVERSITY. 



New Series. — No. X. 

 By B. L. Robinson and J. M. Gkeenman. 



I. Revision of the Genus Tridax. 



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 C'alea. 



V. A Provisional Ke}- to the Species of Poropliyllum ranging 

 North of the Isthmus of Panama. 



VI. Descriptions of New and little known Phanerogams, chieflj^ 

 from Oaxaca. 



