CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY, NEW SERIES, NO. XXXIL 
STUDIES IN THE EUPATORIEAE. 
By B. L. Rospryson. 
Presented March 14, 1906. Received February 21, 1906. 
INTRODUCTORY. 
Durine the summer of 1905 the writer spent some weeks in visit- 
ing several of the larger herbaria of Europe in order to examine and 
photograph plants not hitherto authoritatively represented in the 
Gray Herbarium. In the course of this work considerable attention 
was given to the tropical American species of the great genus Hupa- 
tortum and several allied genera. As must be expected in all such 
large and difficult groups, which have not been subjected to recent 
revision, the study of the type-specimens of several hundred species 
has yielded much new information on the synonymy and proper classi- 
fication of the group. The collections examined were : (1) the herba- 
rium of the Museum of Natural History in Paris, where the herbaria 
of Jussieu, Lamarck, and Michaux were consulted, and special atten- 
tion given to an admirably preserved and well-nigh complete set of the 
tropical American plants collected by Humboldt and Bonpland and 
critically described by Kunth in the Nova Genera et Species; (2) the 
rich private herbarium of the DeCandolle family in Geneva, including 
the invaluable Prodromus types; (3) the herbarium of the Imperial 
Museum of Natural History at Vienna, noteworthy among other ways 
by containing the fullest series available of the species of Jacquin and 
an excellent series of the plants of Pchl and species of Poeppig and 
Endlicher ; (4) the herbarium of the Royal Botanical Museum at 
Berlin, remarkably rich in South American as well as in Old World 
types and in the study of Hupatorieae specially noteworthy by ex- 
hibiting to its fullest extent the recent critical work of Dr. Hieronymus ; 
(5) Professor Urban’s large and carefully selected West Indian her- 
barium ; (6) the herbarium of the Botanical Museum of the University 
of Copenhagen, containing, together with much other material of in- 
terest, the extant types of Vahl; (7) the herbarium of the Linnean 
