EXPLANATION OF THE ILLUSTRATIONS 
Prats XXV. Representative ears of ““Andean’’ 
(non-Tripsacoid) varieties of maize from Guate- 
mala. Varieties of this type are found almost ex- 
clusively at high altitudes, 6500 feet and above, 
and are usually characterized by low chromosome- 
knob numbers (one to five in those illustrated), 
soft cobs, irregular rows of grain, pubescent leaf- 
sheaths, coarse seminal root systems and marked 
susceptibility to lodging and smut. 
Pirate XXVI. Representative ears of the most 
strongly Tripsacoid varieties of maize from Guate- 
mala. Varieties of this type usually have high chro- 
mosome-knob numbers (twelve to sixteen in those 
illustrated), firm cobs, regular rows of grain, gla- 
brous leaf-sheaths, fibrous seminal roots and vary- 
ing degrees of resistance to lodging and smut. 
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