I just received a PM from a new member asking about my "osage orange marmalade" I had posted about back in January. After re-reading the topic, I realized I had made a mistake. I had actually made the marmalade out of Trifoliate orange (poncirus trifoliata), not Osage orange (maclura pomifera). Osage orange is not considered suitable for human consumption, although it is used as an insect repellant!
I have both of these trees
, they both are citrus-like, both have thorns, and both would make excellent barrier hedge rows. Hence the confusion. This just goes to show the value of using scientific names as well as common names.