BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
Camsripar, Massacnusetts, Apri. 11, 1961 Vor. 19, No. 8 
FURTHER ARCHAEOLOGICAL EVIDENCE 
ON THE EFFECTS OF TEOSINTE INTRO- 
GRESSION IN THE EVOLUTION OF 
MODERN MAIZE 
BY 
Watton C. GALINAT AND REYNOoLD J. Ruprk’ 
ANOTHER large and significant collection of prehistoric 
maize cobs (Zea Mays L.) with Tripsacoid characteristics 
that are indicative of introgression from either T'ripsa- 
cum spp. or its maize derivative, teosinte’ (Zea mexicana 
Reeves and Mangelsdorf), has been provided by the 
archaeologist, who is the junior author, for botanical 
analysis. Although there have been about a dozen other 
collections of prehistoric Tripsacoid cobs from north- 
western Mexico and southwestern United States, the 
present material, which comes from Cebollita Cave in 
New Mexico, is the first large (2575 cobs), stratified 
(five levels) collection to become available for statistical 
treatment. 
Our previous statistical study (Galinat, et a/., 1956) of 
Tripsacoid cobs involved a large non-stratified collection 
from two caves in Arizona. At that time we established 
‘Arizona State University, Tempe, Arizona. 
” For the purposes of discussion and consistency, we shall assume, 
as we have previously, that the immediate source of the introgression 
represented by these archaeological specimens is from teosinte rather 
than from less likely hybridization with Tripsacum. 
{ 163 ] 
