Uaupés, should be encouraged partly in an attempt to 
locate the use in caapi of a species of Prestonia, we be- 
lieve that enough is known at the present time to make, 
in summary, the following statements: 
1) 
2) 
3) 
There is no botanical support, nor any reliable sup- 
port in the literature, for the assumption that any 
species of Prestonia (least of all Prestonia amazon- 
ica) is employed as the prime ingredient in the prep- 
aration of ayahuasca, caapi or yaje. 
There is no reliable reference except Spruce’s that 
any species of Prestonia is employed even as one 
of the minor ingredients or admixtures with Ban- 
isterlopsis. 
There is serious doubt that the indole N, N-dime- 
thyltryptamine occurs in Prestonia and every prob- 
ability that the recent report of its presence in this 
genus was due to an erroneous identification of the 
material under analysis. 
[ 120 ] 
