beans entered the southwestern United States from the 
west. Sievas appear in the Verde Valley and at Point of 
Pines, but not in the more easterly Mogollon and Basket- 
maker—Pueblo areas. With the study of additional re- 
mains in the future some relationship between south- 
eastern United States and northeastern Mexico sievas 
may be shown. 
Tepary beans 
The absence of tepary beans (P. acutifolius var. latifo- 
lius Freeman) supports our present knowledge of their 
pre-Columbian and historic distribution. Bukasov (1930) 
and others have indicated a western distribution for con- 
temporary tepary cultivation, while Carter (1945) has 
shown a spread of tepary cultivation from south-central 
Arizona to the north and east in late pre-Spanish times. 
SUMMARY 
1. A total of 845 bean pod fragments from three arch- 
aeological cave sites in Tamaulipas, Mexico, were 
studied and identified. ‘These remains consist of: 
Phaseolus vulgaris (8 domesticated types), P.coccineus 
(one nondomesticated type), P. /unatus (one domes- 
ticated type). 
2. These beans are considered to be distinct from those 
occurring in prehistoric time in the southwestern 
United States. 
3. It is thought that P. coccineus, although gathered as 
a useful wild plant, was not domesticated in this re- 
gion because of non-tuberization of the roots under 
the photoperiod conditions of Tamaulipas. 
4. P. vulgaris remains first appear with preagricultural 
materials 4300-6000 years ago and are the oldest com- 
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