90 
List of Families and Genera as to which Usage Differs 
This list published as [ternational Seed Exchange Communica- 
tion No. rr has taken a great deal of my time for more than a 
year. It includes the nomenclatural and taxonomic differences be- 
tween the Index Kewensis and De Dalla Torre and Harms’ Genera 
Siphonogamarum for Angiosperms, excluding only the two large 
families Compositae and Orchidaceae; it also aims to include 
under ‘ Addita” all recent generic names and others which are 
not in the work of De Dalla Torre and Harms. The number of 
such names proposed or revived since the Vienna Congress, is 
nearly 2,500. 
{4 
> 
With unity as to rules of nomenclature attained in the Cam- 
bridge Congress it may be expected that the numerous nomencla- 
tural differences will be gradually eliminated. While taxonomic 
lifferences are considered outside the scope of an international 
botanical congress, practical requirements in this direction may 
be in large part met by the decision of the London Horticultural 
Congress to prepare an International List of Horticultural Species. 
Systematic Botany, 
3y H. K. SvENson 
During the past year, my first with the Brooklyn Botanic Gar- 
den, [ accompanied the Astor I¢xpedition to the Galapagos and 
Cocos Islands as field botanist. In order to gain a conception 
of the extraordinary vegetation of these islands I spent a week at 
the Gray Herbarium at Cambridge, where undoubtedly the richest 
collection of Galapagos material is located. My brief stay in the 
Galapagos Islands was sufficient for me to realize that much work 
remains to be done on the relationships of the flora of the in- 
dividual islands, relationships especially important from the evolu- 
tionary point of view. | hope that I may again visit them. 
I have been identifying the specimens of this collection with the 
help of several specialists, notably, Mr. Paul C. Standley of the 
Field Museum who has named the Rubiaceae; Dr. H. A. Gleason 
of the New York Botanical Garden who has worked out the 
Melastomaceae; Dr. L. B. Smith of the Gray Herbarium, the 
Bromeliaceae; Mr. C. A. Weatherby of the Gray Herbarium, the 
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