My friend from Florida is a major gourd collector and has items on display in several museums. He cannot resist anything gourd-related so he was compelled to buy this item with a label identifying it as a "petrified gourd" from Ponce City Oklahoma. I see where there are some Permian and Pennsylvanian formations near there so that would eliminate those areas if it were a gourd. I doubt we will be able to know whether it came from the Pleistocene terrace deposits to the east but gourd seems very unlikely anyway.
This has a very distinctive look and the preservation seem fairly good so I thought someone might recognize it from the photos.