BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
CampripGce, Massacuusetts, Ocroser 20, 1948 VoL..13; No.5 
STUDIES IN THE GENUS HEVEA II 
BY 
RicHarp Evans ScHULTES' 
THE REDISCOVERY OF HEVEA RIGIDIFOLIA 
IN 1852, Richard Spruce made the type collection of 
the extraordinary Hevea rigidifolia near the confluence 
of the Rios Uaupés’ and Negro in the Amazonas of 
Brazil. Nearly a century has passed since this achieve- 
ment, but, apparently until recently, no other collection 
has been made, and the species has remained known 
solely from the information derived from a study of the 
type material. 
In March, 1944, during an extensive cytogeographic 
survey carried out in the Amazon Valley for the United 
States Department of Agriculture and in collaboration 
with the Instituto Agrondmico do Norte, Dr. John T. 
Baldwin, Jr. discovered Hevea rigidifolia and introduced 
it into cultivation at Belém do Para. 
In 1945, Felisberto Camargo, director of the Instituto 
Agrondmico do Norte, sent his botanical explorer, Sen- 
hor Ricardo de Lemos Frées, to the upper Rio Negro 
Botanist, Division of Rubber Plant Investigations, Bureau of Plant 
Industry, Soils and Agricultural Engineering, Agricultural Research 
Administration, United States Department of Agriculture; Research 
Fellow, Botanical Museum of Harvard University ; Collaborator, In- 
stituto Agronémico do Norte, Belém do Para, Brasil. 
>This river is known in Colombia as the Vaupés. 
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