Thanks Dennis. I have sampled these fruit at the earlier green stage, and the insides are a light green. Still didn’t remind me of the flavor of store bought limes, although they had the right coloring. These are likely over-ripe as shown; a few have started falling off the tree on their own. But this is the stage (maybe a bit late) that we prefer them. They are sweeter and still have a lot of tartness.
I suppose it doesn’t matter that much whether it is a genuine key lime, something else, or just a root stock, we like the fruit it provides and it is productive for us. But I guess something bothered me about the chance I had been caring for some random root stock all these years 