Samples of the bark and leaves of an individual of 
Hevea rigidifola from Ipanoré were gathered for chem- 
ical examination. Ipanoré is the type locality of this 
species. It is very interesting to compare the analysis of 
the bark and leaf of this plant with that of the air-dried 
rubber specimen from 'Taracud, a locality only a few 
miles east of Ipanoré. Schultes & Lopez 9665 gave the 
following analysis: ‘‘Bark—Resin (acetone extract) 
7.8590; Rubber hydrocarbon (benzene extract) 0.00 
Leaves— Resin (acetone extract) 27.16% ; Rubber hy- 
drocarbon (benzene extract) 1.28%. Poor, typical leaf 
rubber. ”’ 
It is probable that more analyses of rubber samples 
taken in the field from wild populations and authenti- 
cated by identifiable herbarium material might furnish 
us with extremely significant information relative to such 
variations within a species from the same general region. 
[ 44 ] 
