Kevin Craig wrote:
...

Others have responded with specifics, but I'll note this: pecan is a
short-trunked, "limby" tree, branching prolifically. The bulk of the
lumber is likely to be from limbs, thus only available in
short-to-medium lengths. The growth rings will be assymetric, as is
common in all limbs.


As OP noted:

http://www.exotichardwoods-nor thamerica.com/pecanhickory.htm

... 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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FF