When I visited (fellow member of this forum) Jim VH, he said he wanted me to try his poncirus plant. He said he had originally grown the plant from seed, and he believed it was special, that the inside of the fruits did not have any bad flavors. He kept insisting I just bite into the fruit.
I initially thought he might be playing a prank on me, get me to bite down and then be stuck with a terrible flavor in my mouth that wouldn't go away.
I cautiously took a little nibble, and then a bigger bite. It did not have any bad or bitter flavors. No poncirus off flavors.
Now it certainly wasn't good fruit quality, but it didn't have anything about it that could really be described as bad. It had a sort of pine-like flavor.
Jim VH believes this could be a special seedling. The plant is about 4 feet tall. (in Vancouver, WA, right across the bridge from Portland)
Now in complete fairness, I've never actually tasted a poncirus fruit before, but I have tasted a few poncirus hybrids (TaiTri, Glen citrangedin), so I have a good idea what the nasty flavor is like.
At least from my personal perspective, and experience eating it, I completely agree with him that his "special" poncirus plant doesn't seem to have any bad flavor, and is edible. Not sweet, mostly insipid and dry, but no characteristic poncirus bad flavor that I can discern.
Jim said the outer rind has some bad poncirus flavor though, just not the inside. The plant certainly looked just like any other poncirus I had seen, more like Flying Dragon. The plant itself did not look anything like a hybrid.