tial parenchyma tissue, however, shows that the seeds 
were mature when harvested. A single pod of this type 
was found containing three small black seeds (Table III). 
The non-twining shoots on which pods have persisted in- 
dicate this to be a bush variety probably harvested in a 
manner similar to that suggested for the previous type. 
In contrast to all other beans described here, the valves 
of almost all of the ‘‘black seeded bush’’ type are joined 
at the base and attached to the pedicel. 
Long pod, C 33. The pods are curved but show little 
variation in breadth from base to tip, that is, there is 
little tapering; nor is there constriction of the dry pods 
between the seed positions. Most of these valves are dark 
reddish brown in color and have a cartilaginous rather 
than fibrous texture when wet. An occasional pod is 
encountered with the pedicel and peduncle still joined; 
these are approximately 1 and 8 cm. long respectively. 
None of the fruiting branches is attached to a main stem, 
suggesting that ‘‘long pod”’ is vining and that harvesting 
involved the pulling of individual pods as is the common 
contemporary practice with pole beans. No seeds have 
been found attached to the pods. A few fibrous-walled 
variants of C 33 (C 38ain Tables [I and III) are present 
with more seeds than the type and are correspondingly 
larger. 
Discussion 
Runner beans 
Of greatest interest in this group of legumes is the 
occurrence of remains of Phaseolus coccineus, constitut- 
ing the first definite archaeological record of this species 
(Kaplan, 1956). In contemporary agriculture, these 
beans are grown mainly in the highlands of Chiapas and 
the Valley of Mexico. From the Federal District to 
Querétaro, they are frequent, and further north they are 
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