no references to co/orines in colonial sources, I think that 
they are present in the famous Tepantitla fresco where 
strings of seeds and mushrooms are falling from the hand 
of Tlaloc, and where some of the seeds are red and black, 
with the hilum distinctly placed in the red field.”” On the 
slopes of Popacatepetl the sacred mushrooms are still 
taken with colorines. It is vital that the hilum be in the 
red field; if it is in the black patch, it is the toxic seed 
of Abrus precatorius L., also called colorines and much 
used for beads by the Veracruzanos. 
Ololiuhqui — Rivea corymbosa (1.) Hall. fil.* 
* There have recently been suggestions that the correct name of 
ololiuhqui is Turbina corymbosa (L.) Raf. 
These suggestions arise from two articles which have appeared in 
the past several years: Roberty, G.—‘‘Genera Convolvulacearum’’ 
in Candollea 14 (1952) 11-60; Wilson, K.A.—‘‘The genera of Con- 
volvulaceae in the southeastern United States’’ in Journ. Arn. Arb. 
41 (1960) 298-317. 
Roberty separates Ipomoea, Rivea and Turbina, putting the three 
into different subfamilies. He keeps in Rivea only one species of In- 
dia and Ceylon. In Turbina, he has three species; 7’. corymbosa (which 
he states occurs in tropical America, the Canary Islands and the 
Philippines) and two other species of Mexico. 
Wilson, ina key tothe genera of Convolvulaceae in the southeastern 
states, separates out Turbina as a genus distinct from Ipomoea. While 
Turbina is keyed out as a distinct genus, there is no technical con- 
sideration of it in the body of the paper which follows the key. One, 
consequently, must assume that Turbina (as conceived by Wilson) does 
not occur in southeastern United States. There is, furthermore, no 
reference to the binomial Turbina corymbosa as such. Wilson pointed 
out that: ‘‘Generic lines are difficult to draw in this family, and treat- 
ments vary with different authors depending upon the emphasis placed 
on the taxonomic characters used. ... ”’ 
The question of whether to use the binomial Rivea corymbosa or to 
assign the concept to Ipomoea on the one hand or Turbina on the 
other is, in effect, one of personal evaluation by botanists of the im- 
portance of characters. 
When I first discussed ololiuhqui in 1941 (Schultes, R.E.: “A 
contribution to our knowledge of Rivea corymbosa, the narcotic ololiu- 
qui of the Aztecs’’ (1941) ), I looked into the problem of the generic 
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