STUDIES IN THE GENUS HEVEA VI 
NOTES, CHIEFLY NOMENCLATURAL, ON THE 
HEVEA PAUCIFLORA COMPLEX 
BY 
Ricuarp Evans ScHuULTES ! 
THERE has long been confusion and uncertainty in the 
taxonomic and nomenclatural aspects of the study of the 
several concepts known as Hevea Kunthiana, H. pauci- 
Jlora, and H. confusa. Recent studies in the field and 
in the herbarium have contributed much towards a clari- 
fication of some of the difficulties, but a more thorough 
understanding of the representatives of this complex, 
especially of those in British Guiana, would seem to be 
desirable. When further field work has been accom- 
plished, I hope to present a detailed taxonomic study; 
but the need for an understanding of the proper names 
to use in this group is so urgent as to recommend the 
publication of our present knowledge of the nomencla- 
tural aspects of the problem without further delay. 
Hevea pauciflora (Spruce ex Benth.) Mueller- 
Argoviensis in Linnaea 84 (1865) 208. 
Stphonia brasiliensis Humboldt, Bonpland & Kunth 
Nov. Gen. et Sp. 7 (1825) 171. 
' 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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