EXPLANATION OF THE ILLUSTRATION 
Prare XXVII. The evolutionary sequence in maize in the Southwest, 
as herein presented, is summarized in a pictorial manner in this plate. 
In the lower-right-hand corner is an example of pre-Chapalote, the 
first race to appear in the Southwest (about 5000 years ago), When 
teosinte introgression was introduced into this race at about 500 B.C., 
it produced the Early and Evolved Chapalote types shown just above. 
About A.D. 700 a new eight-rowed race, possibly derived from Ca- 
buya of South America, arrived in the Southwest, where it also hy- 
bridized with the indigenous types of Chapalote. Sometimes this 
eight-rowed race reasserted itself in the resulting segregations, except 
for acquiring flinty kernels, as shown by the vertical ear labeled Maiz 
de Ocho-S.W. Flint on the lower left, or nearly reasserted itself as 
illustrated by the adjacent ear, Near Maiz de Ocho. More frequently 
the truly intermediate conditions such as the Fremont Dent type in 
the northern part of the Southwest, the Pima-Papago type above it 
from the southern part of the Southwest or, still farther south, Maiz 
Blando from the Mexican state of Sonora came to predominate. Even 
more productive hybrids eventually evolved from the blending of 
Harinoso de Ocho, Chapalote and teosinte to yield such large ears 
as those of the Pueblo race (top center right) and its Mexican counter- 
part, Cristalino de Chihuahua (top center left). 
Modern counterparts of prehistoric Chapalote and Maiz de Ocho 
ean still be found growing in areas where they became well adapted. 
In the upper left corner are modern survivors, apparently only slightly 
changed, of the Maiz de Ocho which entered the Southwest about 
A.D. 700. The three modern (1961) ears of Chapalote in the upper 
right corner match off precisely with the nearly 2000-year-old ears of 
Early and Evolved Chapalote. The ear of Maiz Blando de Sonora is 
a modern counterpart of the Fremont Dent and Pima-Papago maize 
which have persisted for the last 1000 years. (The provenience is 
given in Table II.) 
