As OP noted:
... Pecan is reported to occur in the wild and is
also cultivated. The largest member of the Hickories,
it usually grows to heights of about 160 to 170 feet
(49 to 52 m)...
'Short and limby' sounds like orchard trees. Most hardwoods
will grow short and limby if they grow without competation
from nearby trees. And, picking pecans from the top of a
160 ft tree would be problematic.
A 'near unlimited supply' of wood may well be orchard wood.
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