BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
CampripGr, Massacnuusetrts, Marcu 16, 1953 Vou, 16, No, 2 
STUDIES IN THE GENUS HEVEA VII 
BY 
RicHarD Evans Scuuures' 
In the course of my studies towards a monograph of the 
genus Hevea, isolated but significant observations fre- 
quently accumulate. In order that these data may be 
available before the completion of a final monograph, I 
have initiated a series of articles in which the results of 
field and herbarium investigations may be published. 
This paper continues the series and consists of miscel- 
laneous taxonomic, nomenclatorial, phytogeographical, 
historical and chemical notes. 
The herbarium studies herein reported were carried 
out in 1950, during my visits to important European bo- 
tanical centers. 
The chemical examinations were made by chemists in 
the United States Department of Agriculture and at the 
National Bureau of Standards on rubber samples which 
I secured in the Amazon from trees the identity of which 
was established and has been authenticated through her- 
barium specimens. 
' Botanist, Division of Rubber Plant Investigations, Bureau of Plant 
Industry, Soils, and Agricultural Engineering, Agricultural Research 
Administration, U. S. Department of Agriculture; Research Fellow, 
Botanical Museum of Harvard University. 
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