CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 

 UNIVERSITY— NEW SERIES, NO. LX. 



I. OX TROPICAL AMERICAN C0:MP0SITAE, CHIEFLY 



EUPATORIEAE. 



By B. L. Robinsox. 



Presented June 26 1919. Received June 26. 1919. 



During the past year the writer has continued his studies on the 

 South American members of the genus Eupatorium, giving particular 

 attention to those of Peru and BoHvia. Of the Peruvian it has proved 

 possible to complete a recension, which, by bringing together widely 

 scattered data, placing on record a considerable number of new species, 

 and furnishing specific keys in each section, will, it is hoped, render a 

 knowledge of these plants much more readily accessible and con- 

 siderably facilitate their precise identification. 



There have been several sources of new information regarding 

 tropical American Eupatoriums and many facts have been observed 

 which were not available during the preparation of the writer's revision 

 of the Colombian, Venezuelan, and Ecuadorian species, a treatment 

 completed about a year ago (Proc. Am. Acad. liv. 235-367, 1918). 

 Thus, for instance, the later portions of Dr. F. W. Pennell's extensive 

 collections from Colombia proved to contain interesting Eupatorium 

 material to an unsuspected extent, including several additional 

 novelties. A small Colombian collection, prepared by Bro. iVriste- 

 Joseph and received at the Gray Herbarium in continuation of ex- 

 change from the United States National Herbarium, has yielded 

 still another new species from the vicinit\' of Bogota, a region already 

 exceptionally rich in its representatives of the genus. A somewhat 

 extended collection of the flora of Caracas and adjacent portions 

 of northern Venezuela has been obtained from Prof. H. Pittier. This 

 has given considerable supplementary information regarding the 

 Eupatoriums of the regions explored. Finally, the expedition of 

 Dr. J. N. Rose to Ecuador has brought in the most notable single 

 collection as yet received from that country, including a suite of some 

 twenty-eight different Eupatoriums, among which at least four merit 



