CONTRIBUTIONS FROM THE GRAY HERBARIUM OF HARVARD 
UNIVERSITY .— NEW SERIES, No. LY. 
By B. L. Rosinson. 
Presented May 8, 1918. Received June 18, 1918. 
I. DIAGNOSES AND NOTES RELATING TO TROPICAL 
AMERICAN EUPATORIEAE. 
Durie the past year, in the course of further work toward a com- 
prehensive treatment of the Eupatorium tribe, the following plants 
have been encountered, which appear to need description as novelties, 
readjustment of rank, or further record as to standing or synonymy. 
Several types of new species and varieties here proposed are hither- 
to unclassified specimens (notably those of Triana, of Lobb, and of 
Kalbreyer) kindly lent to the writer some time ago from the Royal 
Gardens at Kew for investigation as opportunity permitted. These 
are indicated by the abbreviation (K.). For the privilege of examin- 
ing and publishing upon others the writer is similarly indebted to the 
botanists of the New York Botanical Garden (N. Y.), the United 
States National Herbarium (U. S.), Missouri Botanical Garden (Mo.), 
Field Museum (Field Mus.), and University of California (Calif.). 
Plants in the Gray Herbarium are indicated by (Gr.). During the 
preparation of this paper much aid has been derived from photographs 
which the writer was permitted to take of types in European herbaria 
during his journeys in 1900, 1905, and 1910. In some cases fragments 
of types or authenticated specimens have been supplied to the Gray 
Herbarium in return for similar bits from types in this or other groups. 
Occasionally tracings or sketches have also been made. The nature 
of such reference material is briefly indicated by abbreviations which 
will be self-explanatory (phot., fragm., trac., sk., &c.). 
The writer is specially indebted to Drs. H. H. Rusby & F. W. 
Pennell for the privilege of studying the Eupatoriums of their recent 
and extensive collection from Colombia. Dr. Rusby has also per- 
mitted the inclusion here of his E. Squiresii, a hitherto unpublished 
novelty discovered on an earlier expedition to Venezuela. Prof. N. L. 
Britton has aided the writer by the loan of valuable material and by 
information, from time to time as solicited, regarding specimens in 
