more vigorous, has a stronger root system, and is later 
in maturity. Also the ears are somewhat less tapering 
than those of Palomero Toluquefo. Wellhausen ef al. 
(1952) suggested that these modifications had probably 
been brought about through introgression of Oloton, a 
race common in the high altitudes of the state of Chiapas, 
Mexico, and in Guatemala. 
Tuxpeno. (Plate XI, A). Three unusually large cobs 
occurred which showed some resemblance to Tuxpeno, 
the predominating modern race of the lowlands of east- 
ern Mexico. There is some question, however, whether 
these cobs are actually of this race. A combination of 
higher than average hybrid vigor and better than average 
growing conditions could have produced unusually large 
cobs of the race Breve de Padilla, which could be con- 
fused with cobs of Tuxpeno. On the other hand, it is 
possible that 'Tuxpefo, which occurs in this part of 
Tamaulipas today, reached there in prehistoric times and 
it is to avoid overlooking this possibility that we include 
here a specific mention of these three large cobs. 
OTHER Parts OF THE CorRN PLANT 
A total of 8525 specimens of other parts of the corn 
plant were identified. These included stalks, leaves, 
husks, tassels, and chewed quids. 
Stalks 
Like the cobs, the pieces of stalks, 47 in number, 
showed an evolutionary sequence with respect to size, 
the earlier ones being on the average more slender than 
the later. 
Leaves 
Nine leaves or leaf fragments among the specimens 
add no significant information since they are similar to 
the leaves of modern corn. 
[ 43 ] 
