Sounds like a Jamaican lime; what we in Guatemala call limon criollo. It was for many years the secret ingredient in Pepsi Cola...obviously, it is no longer a secret. Post a foto, if you can, of the tree and a closeup of the fruit inside and out, and a closeup of the leaf; with that someone here can surely give you a definitive answer.

Here is a photo of the fruit and the inside as well. I will include a picture of the leaves tomorrow during the day light hours.

Here is a link that might be useful: Mystery Lime

Imawkward,

Unable to follow that link; it just gets me to flicker without any way to find the foto.

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Nice fotos; it is not the lime I thought it might be; I have no idea what it is; but I am sure someone on this site will know.

Why do you call it a lime tree? It doesn't look much like a lime - what does it taste like?

The foto looks more like a mandarin; the abscence of a winged petiole pretty much rules out oranges.

Ragpur lime is actually a mandarin, and this picture looks similar. Does that flying dragon branch in the background originate from the tree or from another tree? I ask because a tree on flying dragon would have to work very hard to reach 25 feet.

I only refer to it as a lime, because we were told it was a lime. The original owner of the tree is no longer living, so it really could be anything. When left on the tree to ripen, the fruit splits open when it turns yellow.

The taste is very tart, but not like a lemon. I'm not sure how else to explain it.

The branch is from the same tree, but I'm pretty sure it's just a sucker that was allowed to continue to grow. The tree is so tall it stretches above my house.

While I can't confirm anything, I think a few of you have hit the nail on the head. I think this isn't a lime at all. Hopefully I can get some fully ripened fruit to find out for sure.