BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
CamprinGe, MassacuuseTts, JANUARY 21, 1952 Voi. 15, No. 4 
STUDIES IN THE GENUS HEVEA IV 
BY 
Ricuarp Evans Scuuutes' 
NOTES ON THE RANGE AND VARIABILITY 
oF HEVEA MICROPHYLLA 
LirrLe has been known about the range and varia- 
bility of Hevea microphylla. This was due partly to the 
scarcity of collections referable to Hevea microphylla and 
partly to an unfortunate confusion of this species with 
an entirely distinct concept. 
THE DISTRIBUTION OF HEVEA MICROPHYLLA 
Until recently, the binomial Hevea microphylla, pub- 
lished by Ule in 1905 on the basis of material from the 
middle Rio Negro, has been considered to be synony- 
mous with HZ. minor Hemsley, a name published six 
years previously for material from the Casiquiare of Ven- 
ezuela which, upon preliminary field examination, would 
appear to be identical with the concept described as HZ. 
pauciflora (Spruce ex Bentham) Muell.-Arg. var. coria- 
cea Ducke. 
I was fortunate in being able to examine type and 
other authentic material of Hevea at the Royal Botanic 
'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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